Jurnal Ilmu Perikanan Tropis Nusantara (Nusantara Tropical Fisheries Science Journal)
Nusantara Tropical Fisheries Science adopts a broad, interdisciplinary approach to the subject of fish biology and fisheries. It draws contributions in the form of major synoptic papers and syntheses or meta-analyses that lay out new approaches, re-examine existing findings, methods or theory, and discuss papers and commentaries from diverse areas. Nusantara Tropical Fisheries Science is published biannually in February and August
Faculty of Fisheries and Marine Science, Mulawarman University
Types of mesoplastic waste in the Manggar Beach tourism area, Balikpapan City, East Kalimantan
Plastic waste poses a significant threat to the global environment, particularly in coastal and marine ecosystems. Among its various forms, mesoplastics, measuring between 5 and 25 mm have attracted considerable attention. This study aims to identify and analyze the types, weights, quantities, compositions, and densities of mesoplastics found along Manggar Beach, a tourist destination in Balikpapan City, East Kalimantan. Sampling was conducted in two periods: April (Period I) and August (Period II) of 2022. A purposive sampling method was applied using a 100-meter transect line divided into 5x5 meter lanes, followed by the placement of 1x1 meter quadrats. In Period I, four types of mesoplastics were identified as film, fiber, fragments, and styrofoam, while only film was detected in Period II. A total of 43 mesoplastic particles (weighing 9.45 grams) were recorded in Period I, compared to just 5 particles (0.15 grams) in Period II. By weight, styrofoam made up the largest proportion (49%) in Period I, whereas film accounted for 100% in Period II. The average mesoplastic density observed in this study was 0.38 particles per square meter.
Copyright (c) 2025 Jurnal Ilmu Perikanan Tropis Nusantara (Nusantara Tropical Fisheries Science Journal) https://creativecommons.org/licenses/by-nc-sa/4.0
Analysis of the Seawater Quality Index in the Marine Waters of Bontang City, East Kalimantan
Seawater quality is a key factor in determining the health of coastal ecosystems and the sustainability of marine resources. Anthropogenic activities such as the discharge of industrial and domestic waste, marine transportation, and intensive fishing practices can influence the physical, chemical, and biological parameters of seawater. Research on seawater quality in the marine waters of Bontang City has been conducted, but remains very limited in number. This study aims to analyze the Seawater Quality Index (IKAL) in the marine waters of Bontang City. The analytical method employed refers to the Regulation of the Minister of Environment and Forestry of the Republic of Indonesia No. 27 of 2021. The results indicate that the average Seawater Quality Index (IKAL) in Bontang City during the second semester of 2023 was 72.69, which is categorized as good condition.
The concentration of Mn and Fe metals in water and sediment of the Sanga-Sanga River, East Kalimantan Province
This study aimed to analyze the concentrations of manganese (Mn) and iron (Fe) in both water and sediment samples from the Sanga-Sanga River, Kutai Kartanegara Regency, East Kalimantan Province. The research was conducted from October to December 2024 at three stations representing the upstream, midstream, and downstream sections of the river. Sampling was performed using a purposive method based on site characteristics, and analyses were carried out both in situ and at the Water Quality Laboratory, Faculty of Fisheries and Marine Science, Mulawarman University. The concentrations of Mn and Fe were compared with the Indonesian river water quality standard (Government Regulation No. 22 of 2021) and sediment quality guidelines established by the Australian and New Zealand Environment and Conservation Council (ANZECC, 2000). The results showed that Mn concentrations in river water ranged from 0.325 to 1.181 mg/L, exceeding the permissible limit of 0.1 mg/L, while Fe concentrations ranged from 0.3475 to 0.468 mg/L, surpassing the standard of 0.3 mg/L. In sediments, Mn concentrations ranged from 42.38 to 964.47 mg/kg and Fe concentrations from 11,341.23 to 50,344.72 mg/kg, with several stations exceeding the ANZECC guideline limits. Higher concentrations were generally found at midstream and downstream stations, particularly in areas influenced by coal mining, barge transport, and ship repair activities. These findings indicate that the Sanga-Sanga River has experienced notable contamination by Mn and Fe, primarily due to anthropogenic activities related to coal industry operations. Continuous monitoring, stricter waste management, and the implementation of pollution control measures are recommended to prevent further environmental degradation and protect aquatic ecosystems.
Perceptions of fishers in the Mutiara Indah Teritip Joint Business Group (KUB) on the Role of the Food, Agriculture, and Fisheries Agency (DP3) in East Balikpapan District, Balikpapan City
Although fisheries institutions have developed, most remain small-scale operations managed traditionally, with weak management practices and limited access to information and technology. Understanding community perceptions is therefore essential. This study aims to examine fishers’ perceptions, both cumulatively and partially, within the Joint Business Group (Kelompok Usaha Bersama/KUB) Mutiara Indah Teritip regarding the role of the Food, Agriculture, and Fisheries Agency (Dinas Pangan, Pertanian dan Perikanan/DP3) in East Balikpapan District, as well as to identify the challenges faced by DP3 in this area. The research was conducted from September 2024 to May 2025 in East Balikpapan District, Balikpapan City. A total of 17 respondents were selected using purposive sampling. The results showed that the cumulative perception score of fishers in KUB Mutiara Indah Teritip regarding the role of DP3 reached 40.18, which falls within the range of 35.02–45.00 and is categorized as high. Similarly, the partial perception scores were also categorized as high, with indicator values as follows: program development for fishing activities (8.29), policy formulation for fisheries (8.35), supervision of fishing permits (8.41), guidance and training for fishers (7.88), and the application of fishing technology (7.24).
Visitor Perceptions of the Educational Fish Pond Tourism Site in Sumber Rejeki Hamlet, Loh Sumber Village, Loa Kulu, East Kalimantan
The Educational Tourism Fish Pond of Sumber Rejeki Hamlet, Loh Sumber Village, serves as a potential medium for introducing fisheries-related activities, including aquaculture, aquatic resource management, and the sustainable application of fisheries technology to the community. The objective of this study was to examine visitors’ perceptions of the educational tourism fish pond in Sumber Rejeki Hamlet, Loh Sumber Village, Loa Kulu Subdistrict. The research was conducted from November to December 2024 using the accidental sampling method. The respondents consisted of 45 visitors to the tourism site. Data were analyzed using descriptive analysis with a Likert scale measurement. The results indicate that visitors’ perceptions of the educational tourism fish pond fall into the “very good” category (87.05), within the score range of 87–103. This evaluation was based on the following indicators: tourism object (13.38, very good), accessibility (7.87, good), facilities (39.64, very good), information and promotion (17.29, very good), and management services (8.87, good).
Study on the dynamics of Fish Farmer Group (Pokdakan) in Bukit Pinang Village, Samarinda Ulu District, Samarinda City
The aim of the research, is to determine the profile of the Rejang Raya Lake fish cultivator group (Pokdakan), and to find out the level of dynamism of the Rejang Raya Lake fish cultivator group (Pokdakan). The sampling method used was the census method with the number of respondents taken as many as 10 respondents. The analytical method used is a Likert scale to determine the level of dynamics of the Rejang Raya Lake fish cultivator group for each indicator: group goals, group structure, group tension, group effectiveness, hidden intentions are in the high category. The level of dynamics of the Rejang Raya Lake Fish Cultivator Group (Pokdakan) cumulatively obtained a score of 79.90, which is at a high level in the range of 63-81 and can be interpreted that the level of dynamics of the group is at high criteria (already dynamic) or the management and members it's been going well.
Analysis of heavy metal content (Pb, Cu, Cd, and Fe) in the seagrass Thalassia hemprichii as a bioindicator of marine pollution in Tihi-Tihi Village, Bontang City, East Kalimantan
The waters of Bontang City have relatively productive anthropogenic activities that trigger changes in the quality of surrounding waters that have the potential for pollution in the waters of the Bontang City area and there is a seagrass ecosystem that can be used as a natural indicator because it is sensitive to the presence of pollutants. To answer the problems found, this final project aims to determine the concentration levels of heavy metals (Pb, Cu, Cd, and Fe) contained in seagrass Thalassia hemprichii species in the waters of Tihi-Tihi Village. This study uses descriptive methods and location determination using the purposive sampling method and heavy metal analysis in water samples, sediments, and seagrass T. hemprichii analyzed using the AAS (Atomic Absorption Spectrophotometry) tool. The results showed that the waters of Tihi-Tihi Village had been contaminated with the heavy metal content of Pb, Cu, Cd, and Fe with different concentration levels, the metal content in water ranged from <0.001-0.098 mg/L, in sediment ranged from 2.64-1063.53 mg/kg and in seagrass ranged from 0.02-3468.08 mg/kg.
Analysis of the impact of Tilapia Aquaculture Village Development (Oreochromis niloticus) on the welfare of fish farmers in Ponoragan Village, Loa Kulu District, Kutai Kartanegara Regency
This study aims to analyze the impact before and after the implementation of Ministerial Regulation of Marine Affairs and Fisheries (Permen-KP) No. 16 of 2022 on the Tilapia Aquaculture Village in Ponoragan Village on household income, employment absorption, and to identify the main challenges faced by fish farmers. The sampling method used was purposive sampling, with a total of 30 tilapia farmers as respondents and two key informants. The data were analyzed using income analysis, average income difference analysis with a T-test, and labor absorption analysis. The study results show that the average income of tilapia farmers before the implementation of the aquaculture village policy was IDR 120,569,272 per month, increasing to IDR 606,954,928 per month after implementation. This indicates a rise in the average income of fish farmers by IDR 486,385,656 following the policy's implementation. The implementation of the aquaculture village policy also had an impact on labor absorption, both from within and outside the family. Before the policy was implemented, the percentage of labor from within the family was 0.01228 percent, increasing to 0.01283 percent after implementation. Meanwhile, the percentage of labor absorption from outside the family increased from 0.01283 percent to 0.01897 percent. This increase reflects the additional workforce employed, both from within and outside the family, in response to increased production, income, and the farmers' commitment to involving the surrounding community. The main challenges faced by tilapia farmers include extreme weather conditions that often cause harvest failures, river water intrusion into ponds, which increases water volume and leads to fish escaping, and the use of pesticides by farmers to control fish pests and predators. These findings illustrate that the aquaculture village policy has great potential to improve farmers' welfare, but it must be accompanied by mitigation efforts to address existing challenges.
Water quality assessment using the STORET method and formulation of pollution control strategies in the Sangatta River, East Kutai Regency, Indonesia
The Sangatta River, located in East Kutai Regency, East Kalimantan, is a vital water resource that plays a significant role in supporting both local communities and ecosystems. However, the increasing pressure on this river necessitates regular monitoring to assess its water quality status. This study aims to assess and analyze the water quality of the Sangatta River, determine its water quality status, and identify potential measures for controlling water pollution in the river. The research employed the STORET method. Based on this method, the results were as follows: -22 (upstream 1), -34 (upstream 2), -50 (downstream 1), -54 (downstream 2), and -40 (downstream 3). These findings indicate that the Sangatta River is classified as heavily polluted, with an overall score of -40 according to the STORET method. Efforts to control river water pollution should focus on social and institutional aspects, particularly by enhancing community participation in pollution control efforts for the Sangatta River.
The relationship between salinity and pond area in the Mahakam Delta, East Kalimantan
This study aims to analyze the relationship between salinity and the extent and type of mangrove vegetation in ponds within the Mahakam Delta, East Kalimantan. Sampling was conducted in ponds with different salinity levels: 0–10 ppt, 11–20 ppt, and 21–30 ppt, with each salinity category represented by 10 pond plots. Data analysis was performed using linear regression. The results showed a strong relationship between salinity variation and pond area, with an r-value of 0.630. The extent of pond expansion is related to the original mangrove type present in the pond area. This information can be used as a basis for determining suitable aquatic species for cultivation based on salinity levels. In other words, the selection of aquatic species for cultivation can be adjusted according to the appropriate pond area. Further research is needed to determine whether other factors influence the relationship between salinity levels and pond area in the Mahakam Delta region.
Analysis of water fertility status based on the Trophic State Index (TSI) in the Air Hitam Urban Polder, Samarinda Ulu District, East Kalimantan
Waters near urban centers are highly vulnerable to pollution, a condition likely occurring in the Air Hitam Polder in Samarinda, which receives inflow from urban drainage and is surrounded by intense human activity. This study aimed to determine the Polder’s trophic status using the Carlson Trophic State Index (TSI) based on water transparency, total phosphate, and chlorophyll-a, analyzed spatially and temporally. It also assessed general water quality and examined the relationship between nutrients (phosphate, nitrate, ammonia) and chlorophyll-a. Measurements at five stations included transparency, chlorophyll-a, DO, EC, TDS, temperature, pH, and turbidity, with laboratory analyses for phosphate, nitrate, and ammonia. Sampling was conducted six times. Results show Station 3 had the highest TSI (75.25), likely due to its location near the main inlet carrying organic and inorganic materials. Temporally, the Polder was classified as hypereutrophic, with TSI values >60 at all stations. Phosphate had the strongest relationship with chlorophyll-a. Several parameters (DO, EC, TDS) met water quality standards, while others (phosphate, nitrate, ammonia, temperature, pH, transparency, turbidity) exceeded limits. Overall, current conditions are unsuitable for aquatic life, indicating the need for improved management to restore the ecological function of the Air Hitam Polder.
Water quality characteristics in the waters of Pangempang, Muara Badak, East Kalimantan
The Pangempang waters, located within the estuarine area of Muara Badak, have experienced continuous coastline changes due to annual erosion. Monitoring water conditions in this region is essential to evaluate environmental suitability and detect potential threats. This study examined the physical and chemical properties of the water, following the guidelines of Government Regulation No. 22 of 2021. Observations were conducted at five selected sites: a shrimp pond, a river area adjacent to the pond, the river mouth near mining activities, a tourist area on Pangempang Island, and the outer section of the island near the dock, representing the Pangempang waters. Overall, the results indicate that water quality remains within acceptable limits for marine biota. However, certain parameters, such as temperature, salinity, and nitrate levels, deviated from the established standards. These variations are influenced by weather conditions, location, and potential organic waste input from activities along the study area.
Study of shoreline changes using Landsat Satellite Imagery in Tanjung Tengah and Saloloang Villages, Penajam District
The coastal areas of Tanjung Tengah and Saloloang sub-districts that used as ecotourism, this research needed to determine changes in the coastline at these locations. The study aims to determine the shift of the coastline along with the extent of abrasion and accretion for 15 years on the coast in Tanjung Tengah and Saloloang Villages, Penajam District, Penajam Paser Utara Regency. The study was conducted from October 2023 to November 2023. The method used is the Digital Shoreline Analysis System (DSAS) analysis using Landsat 7 ETM and Landsat 8 OLI satellite imagery obtained from the USGS site. The results of the study showed that during the period 2009 - 2023 along the coastal areas of Tanjung Tengah and Saloloang Villages, was greater accretion than abrasion, period 2009-2015 the coast experienced a shift towards the sea (Accretion) reaching 311.95 meters. Then experienced a retreat towards the land reaching 267.11 meters from the period 2015-2023. The total area of ​​the area experiencing accretion and abrasion respectively is 81.42 ha and 41.68 ha.
Macrozoobenthos diversity at Istana Amal Beach, Penajam Paser Utara Regency, East Kalimantan
Istana Amal Beach, located in Penajam Paser Utara, East Kalimantan, is one of the region's ecotourism destinations. One of the key indicators of environmental quality in this area is the presence of macrozoobenthos. This study, conducted in December 2023, aimed to identify the types of macrozoobenthos present, calculate the diversity, evenness, and dominance indices, and assess the physical and chemical parameters of the water at Istana Amal Beach. A purposive sampling method was applied at two stations, selected based on different activity types in the area. The results revealed the presence of macrozoobenthos from two classes: Gastropoda and Bivalvia, comprising a total of 16 species. The ecological index values indicated a moderate diversity (H' = 2.2), high evenness (E = 0.8), and low dominance (D = 0.1), suggesting a relatively balanced ecosystem. Water quality measurements at both sampling points showed a salinity of 30 ppt, pH averaging 7.65, temperature of 30°C, and dissolved oxygen levels averaging 5.2 mg/L. The substrate at the site was identified as having a sandy texture.
Identification of types and abundance of microplastics in coastal sediments of Tanjung Jumlai Beach, North Penajam Paser Regency, East Kalimantan
The existence of microplastics is affected by the many activities in the community related to the use of plastic, as well as uncontrolled disposal of plastic waste so that plastic waste enters the waters through water flows and will degrade into smaller sizes. This research aims to identify the type, abundance, and composition, as well as determine differences in abundance between types of microplastics in Tanjung Jumlai Beach sediments. Sampling was conducted by drawing a transect line 100 meters long, then dividing it into 5 lanes each measuring 20 meters. Each lane was subdivided into sub-transect boxes measuring 5×5 meters. Then, within each 5×5 meter sub-transect, 1×1 meter sub-transect boxes were created, making 25 sub-transect boxes of 1×1 meter in each 20-meter lane. From these, 5 boxes were selected using randomizer application. Sediment samples that have been processed were then identified using a microscope. There were three types of microplastics found in Tanjung Jumlai beach, namely 65% fragments with an abundance of 10.340 particles/kg/m2, 19% fiber with an abundance of 2.960 particles/kg/m2, and 16% film with an abundance of 2.580 particles/kg/m2. There is a significant difference in abundance between fragment microplastics and film and fiber microplastics. There is no significant difference in abundance between film microplastics and fiber microplastics found on the coast of Tanjung Jumlai, Penajam Paser Utara Regency, East Kalimantan.
Analysis of microplastic content in sediments of two garden ponds located in the Mulawarman University Campus
Plastic waste is the type of waste that is most commonly found in our environment. Plastic waste that decomposes and degrades into smaller particles is called microplastic. Small-sized microplastics (<5 mm) can accumulate in water sediments and are difficult to decompose, making this material remain in the environment for a long time. This research aims to determine the microplastic content in the sediment of the main gate garden pond and FEB garden pond at Mulawarman University. This research was carried out for 3 months starting from determining the research location until microplastic analysis. The research location was determined by purposive sampling in 2 garden ponds with 5 stations in each pond. Analysis of microplastic content in sediment was carried out using a separation method based on specific gravity using NaCl solution. Microplastic identification was carried out using a stereo microscope (8-16x magnification). The results of this research show that the types of microplastics found were fiber, fragments and films with the dominant type of microplastic being fiber. The highest abundance of microplastics was found in the FEB garden pond at 4,350 particles/kg, while in the main gate garden pond, it was 3,800 particles/kg.
Microplastic abundance in sediments of the artificial ponds at Mulawarman University, Samarinda, East Kalimantan
Microplastics present in the environment, particularly in sediments, pose potential threats to aquatic organisms, as they can impair organ function when ingested. This study aims to assess the abundance, types, and colors of microplastics in the sediments of the artificial pond at Mulawarman University, Samarinda. The research employed a purposive sampling method. The Faculty of Agriculture pond had a higher microplastic abundance compared to the UNMUL HUB pond. Nonetheless, statistical analysis using a t-test showed no significant difference in microplastic levels between the two sites at Mulawarman University, Samarinda (p-value > 0.05). Overall, the artificial ponds at Mulawarman University, East Kalimantan, contained an average of 275 particles of microplastic per kilogram of dry sediment. Specifically, the Faculty of Agriculture pond had 161.25 particles/kg, while the UNMUL HUB pond had 113.75 particles/kg. The microplastics found consisted of fibers, fragments, films, and pellets, with colors including black, blue, red, brown, yellow, and white.
Survival strategies of gill net fishermen households in North Bontang District, Bontang City, East Kalimantan
This study aims to determine the socio-economic conditions and survival strategies of gillnet fishermen households in maintaining their lives. The research was conducted for 11 months from July to May 2024 in Bontang Kuala Village, North Bontang District, Bontang City. The method used in sampling fishermen is simple random sampling with a total of 34 respondents. The analysis method uses qualitative descriptive analysis. The results showed that the socio-economic conditions of the majority of gill net fishermen were productive age 53-59 years, the average education level was elementary school 26 people, fishermen's income ranged from IDR 420,000 - IDR 3,000,000 per month with an average per fisherman IDR 2,031,470. Their status is owner fishermen with fishing fleets in the form of boats with no engine, boats with ketinting engines and boats or boats with dompeng engines. Fishermen's residences are generally semi-permanent houses with good physical conditions and the land ownership status of the house building is Hak Guna Bagunan (HGB). Fishermen's survival strategies are carried out in three ways, namely, active strategies by doing side jobs, optimising the role of family members (wife and children) and increasing working hours at sea. Passive strategies, reducing the cost of food, clothing, education and setting aside money or saving money from fish sales. Network strategies, making loans through horizontal social networks (family) and vertical social networks (collectors), as well as economic or financial institutions, such as cooperatives, banks, People's Business Credit (PBC) through fisheries organisations and utilising poverty programs.
Analysis of heavy metal content (Pb, Cu, Mn, and Zn) in water and sediment of seagrass beds in Tihi-Tihi waters, Bontang City, East Kalimantan, Indonesia
Seagrass has clear economic benefits in supporting the availability of various commercial fish species and also serves multiple ecological functions. The presence of seagrass in marine waters can act as a bioindicator of heavy metal pollution, as it can absorb and accumulate contaminants. Until now, the exact concentration of heavy metals in the water and sediment of seagrass beds in Tihi-Tihi Village, Bontang City, has not been clearly known. This study aims to determine the content of heavy metals (Pb, Cu, Mn, and Zn) in the water and sediment of seagrass beds in Tihi-Tihi Village, Bontang City, East Kalimantan. The results showed that the concentrations of heavy metals (Pb, Cu, Mn, and Zn) in the water were the same across all stations, ranging between <0.001–<0.003 mg/L, which is below the quality standards set by the government. Lead (Pb) is the heavy metal of most concern due to its concentration falling within the Severe Effect Level. Further studies are needed to investigate the potential impacts of the high concentration of Pb in the sediment of this seagrass bed.
The potential of pineapple peel flour (Ananas comosus) in controlling Aeromonas hydrophila infection in sangkuriang catfish (Clarias gariepinus)
Hematological conditions can reflect the health status of fish. This study aimed to analyze the effect of adding different doses of pineapple peel flour to feed on clinical symptoms, anatomical pathology, survival rate, hematological parameters, and cellular immunity of Sangkuriang catfish after infection with Aeromonas hydrophila. The study was conducted using a Completely Randomized Design (CRD) with four treatments and three replications. The treatments consisted of feed supplemented with 0%, 10%, 20%, and 30% pineapple peel flour. The results showed that different doses of pineapple peel flour in feed had a significant effect (P<0.05) on anatomical pathology, survival rate, hematocrit levels, total erythrocytes, total leukocytes, and the percentage of lymphocytes, monocytes, and neutrophils in Sangkuriang catfish after A. hydrophila infection. The findings also indicated that the 20% dose of pineapple peel flour in feed was the most effective in controlling A. hydrophila infection.
Water quality analysis during tidal conditions using the Pollution Index Method in the Karang Mumus River, East Kalimantan
The Karang Mumus River, located in East Kalimantan, serves as an essential resource for the local community, supporting fisheries, trade, and household activities. However, these uses contribute to waste accumulation, potentially impacting the river's water quality. Tidal movements play a crucial role in water circulation, with the river's flow influenced by the Mahakam River’s tides, leading to backwater flow during high tide. This tidal phase affects the dispersion of pollutants. This study aims to assess the water quality, Pollution Index, and variations in water conditions between high and low tide in the Karang Mumus River. Sampling was conducted at three research stations: Station 1 (Gelatik Bridge), Station 2 (Perniagaan Bridge), and Station 3 (Selili Bridge) from September to November 2023. Water quality measurements were performed both in situ (on-site) and ex situ (at the Water Quality Laboratory, Faculty of Fisheries and Marine Science, Mulawarman University). The analysis follows Government Regulation (PP) No. 22 of 2021 on Environmental Protection and Management (Appendix VI). Results indicate that the DO and COD parameters only meet class III-IV water quality standards, while color, temperature, TDS, TSS, BOD, total phosphate, and nitrate comply with class I-IV standards. The Pollution Index (IP) assessment, based on class I-IV quality standards, categorizes the Karang Mumus River as meeting quality standards to lightly polluted, with an IP range of 0.53 - 2.90. According to Minister of Environment Decree No. 115 of 2003, water meeting quality standards has an IP of 0 < IP < 1.0, while lightly polluted water falls within 1 < IP < 5.
Provision of Fitoimun® in Feed for the Growth and Survival of White Snapper (Lates calcarifer) Raised in Silvofishery Ponds in Muara Badak Ulu Village, Muara Badak District, Kutai Kartanegara Regency
This study aims to analyze the effect of adding Fitoimun® as a natural medicine on barramundi/white snapper (Lates calcarifer). Maintenance is carried out for 30 days, white snapper fry measuring 72-103 g with floating net cage containers measuring 4x4 m2 with a stocking density of 14 heads / repeats. The method used in this study was using Complete Randomized Design (RAL) with 3 treatments 3 replications with doses P0: 0 mL/kg feed, P1: 20 mL/kg feed, P2: 24 mL/kg feed. Parameters observed include survival, absolute weight growth, specific growth rate, and feed conversion ratio. The results obtained from the study showed that the administration of Fitoimun® had no real effect, although the application of Fitoimun® dose of 20 mL/kg feed had a survival rate of 100%, absolute weight growth of 78.7g, a specific growth rate of 2.1%, and the best feed conversion ratio of 1.63 than other doses.
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Population Dynamics of Yellow Prawn (Metapenaeus monoceros) Captured at Night in the Waters of Samboja Kuala, Kutai Kartanegara Regency
Samboja Kuala is one of the Kelurahan in Samboja District which is an area where most of the population works as fishermen. There are two types of fishery activities in the Samboja Kuala area, namely capture fisheries (fishermen) and aquaculture fisheries. One of the most common catches obtained by fishermen is shrimp. Yellow-spotted shrimp (Metapenaeus monoceros) is one of the catches of fishermen shrimp in Samboja Kuala Waters. This study aims to determine several parameters of population dynamics using the carapace length data frequency method. The research was conducted in Samboja Kuala waters, Kutai Kartanegara Regency, in November-December 2022. Based on the results of the study, the sex ratio between males and females was 0,38: 2,65. The length range in male and female sex is 48,34 mm – 78,85 mm and 48,80 mm – 90,78 mm. And the natural mortality (M) of males and females was 1,27 per year and 1,65 per year, the capture mortality (F) of males and females was 0,63 per year and 1,64 per year, the total mortality of males and females was 1,90 per year and 3,29 per year, and the exploitation rates of males and females were 0,33 and 0,50. New additions of males occurred in October by 16,27% and new additions of females occurred in October by 24,93%. And it is known that the yield per recruitment value is 0.04 grams / recruitment.
Copyright (c) 2023 Jurnal Ilmu Perikanan Tropis Nusantara (Nusantara Tropical Fisheries Science Journal) https://creativecommons.org/licenses/by-nc-sa/4.0
Analysis of Distribution and Marketing Margins of Sunu Grouper (Plectropumus leoparsus) in Teluk Sulaiman Village, Biduk-Biduk District, Berau Regency
The study was conducted with the aim of analyzing and describing how the distribution process and marketing margins of Sunu Grouper (Plectropomus leopardus) in Sulaiman Bay Village. The research was carried out for 9 months from March to December 2022 in Kampung Teluk Sulaiman, Biduk-Biduk District, Berau Regency. The method used in sampling fishermen is purposive sampling with a total of 21 respondents, while in sampling collecting traders and retailers using the snowball sampling method as many as 10 people. The analysis method uses qualitative descriptive analysis. The results show that the marketing channel pattern on the sale of Sunu Grouper Fish in Kampung Teluk Sulaiman there are 2 levels of marketing channels of the level one channel pattern and the second level channel pattern. Based on the results of the margin calculation of each Sunu Grouper marketing institution in Teluk Sulaiman village, the institutions that obtained a larger margin were collecting traders of IDR 25,000, while retailers of IDR 20,000
Marketing Channels of Sangkuriang Catfish (Clarias gariepinus) Hatchery Business in Karang Tunggal Village, Tenggarong Seberang District
This study aims to determine the marketing channel pattern of Sangkuriang Fahtoni catfish hatchery in Karang Tunggal Village, Tenggarong Seberang District, Kutai Kartanega Regency. This research was carried out from July 2022 to January 2023 at the Sangkuriang Fahtoni Catfish Hatchery, Karang Tunggal Village, Tenggarong Seberang District, Kutai Kartanegara Regency. The sampling method in research applies case study techniques. A sample of 1 respondent with reference to the census method. The results showed that there are 2 institutions involved in marketing activities at the Sangkuriang Fahtoni catfish hatchery, namely producers (Fahtoni hatchery business), retailers, and consumers. Marketing funnel pattern, level zero and level one marketing channel pattern.
Analysis of the welfare level of fish farming groups in Sebulu Ulu Village, Sebulu District, Kutai Kartanegara Regency
Economic development is the process of increasing overall income and per capita income while considering population growth and maximizing welfare for the benefit of families and communities. This study aims to analyze the welfare level of fish farming groups using indicators from the Central Bureau of Statistics (BPS) and the Fish Farmers' Exchange Rate (NTPi). The required data consists of both primary and secondary data in accordance with the research objectives. The research findings indicate that fish farmers in Sebulu Ulu Village, Sebulu District, Kutai Kartanegara Regency, are categorized as prosperous. Based on the 2016 BPS welfare indicators, the average score obtained was 19, with 6 respondents (60%) classified as having a moderate level of household welfare, meaning that their living conditions are fairly prosperous. According to the NTPi indicator, the total income of fishing families was 1.23, while the total income of fish farming businesses was 1.96. Since these values are greater than 1, it indicates that the majority of fish farming families are already prosperous.
Analysis of Nitrogen and Phosphate Content During High and Low Tides in The Karang Asam Besar River in Samarinda City
Rivers are open waters that flow and get input from various human activity discharges such as; settlements, industries that will result in changes in physical, chemical and biological factors in the waters. This can cause damage, disturbance and danger to living things that depend on water resources. This research was conducted in March 2022 in Karang Asam Besar River, Samarinda City, East Kalimantan Province. This study aims to determine the difference in Nitrogen and Phosphate content at high and low tide in Karang Asam Besar River, Samarinda City. Total Nitrogen at the five stations in the Karang Asam Besar River at average values ranged from 13.02-16.45 mg/L and at low tide ranged from 13.20-20.78 mg/L, the highest Nitrogen value at high tide was at Station 2 and the lowest at Station 4, while the highest Nitrogen at low tide was at Station 4 and the lowest at Station 1. Total Phosphate at the five stations at high tide ranged from 0.14-0.19 mg/L and at low tide ranged from 0.18-0.23 mg/L, the highest Total Phosphate value at high tide was at Station 1 and the lowest at Station 4, while the highest Phosphate at low tide was at Station 4 and the lowest at Stations 1, 3 and 5. Nitrogen compounds at each station in the Karang Asam Besar river based on the quality standards of PP No. 82 of 2001, Ammonia has exceeded the quality standard threshold which exceeds 0.5 mg/L. Nitrite does not exceed the quality standard threshold of less than 0.06 mg/L. Nitrate does not exceed the quality standard threshold value of less than 10 mg/L. Phosphate is still within normal levels and there is no pollution by phosphate compounds.
Plankton Community Structure in Seagrass Beds at Selangan Hamlet, Bontang City, East Kalimantan
Plankton is an organism that lives floating in the water whose movement is influenced by the current. The presence of plankton in a water body can be used as a bioindicator because it has a high level of sensitivity and is also influenced by changes in water conditions. Changes in water conditions can be caused by human activities. The purpose of this study was to determine the structure of the plankton community in seagrass beds in the waters of Selangan Hamlet. This research was conducted in November-December 2019 in Selangan Hamlet, Bontang City, East Kalimantan. Data analysis includes abundance, diversity index, uniformity index and dominance index. The results showed that the composition of plankton species found in the waters of Selangan Hamlet at 4 stations with conditions at high tide and low tide obtained 13 plankton classes namely Cyanophyceae, Bacillariophyceae, Oligotrichea, Dinophyceae, Foraminifera, Chlorophyceae, Trebouxiophyceae, Conjugatophyceae, Hexanauplia, Crustaceae, Gastropoda, Tubulinea, and Euglenoidea consisting of 47 plankton species. Plankton abundance ranged from 893-2,514 ind/L. The structure of the plankton community in the waters of Selangan Hamlet has a Diversity Index (H') value in the medium category with a range of values of 2.28-2.99, Diversity Index (E) category of stable plankton communities with a range of values of 0.82-0.95, and Dominance Index (C) category there is no dominant genus at each research station with a range of values of 0.06-0.14.
The relationship between the characteristics of seagrass beds as a macro-rubbish trap in Balikpapan Bay, East Kalimantan
Balikpapan Bay is a waters that become sea transportation used by the community and also companies. Community and company activities that use sea transportation cause a lot of garbage in the waters of Balikpapan Bay Seagrass beds are stretches of seagrass vegetation that cover a coastal area or shallow sea. seagrass Balikpapan Bay, East Kalimantan. Data collection using to quadrant transect sampling. Analysis of the data used to determine the relationship between macro-rubbish and seagrass types of rubbish, rubbish volume and seagrass stands. Sampling was carried out using a 50 x 50 cm transect at 4 stations with 3 repetitions. The results of the study found 2 types of seagrass, namely E. acoroides and T. hemprichii. Then 2 types of waste were found, namely organic and inorganic waste Based on the results of the correlation test between macro-rubbish volume and trash seagrass stands, it stated that there was no positive correlation in seagrass beds in the waters of Balikpapan Bay, East Kalimantan.
Concentration of Heavy Metal Pb and Cu in Reef Fish at the Waters of Miang Besar Island in Kutai Timur Regency
Miang Island is a transportation route for coal ships and a place for loading and unloading coal, then there are also oil palm companies around this island. On this island there are also still islanders who carry out household activities in this area, such as washing activities, thus producing household waste in the waters on this island. Therefore, community activities carried out on this island can contribute to the burden of pollution of waters and reef fish in these waters, therefore it is necessary to conduct research on heavy metal levels that have contaminated organisms in these waters related to the pollution conditions that occur. This research was conducted in February 2023 in the waters of miang island and analyzed water quality and heavy metal content in the water quality laboratory and soil laboratory of mulawarman university. The parameters that will be observed are the analysis of heavy metals lead (Pb) and copper (Cu) found in reef fish meat and statistical analysis using the Chi-Square test by comparing heavy metal content in reef fish against water quality data. In this study, reef fishes that have been analyzed are Lutjanus decassatus, Pentapodus caninus, Ephnephlesu ongus, Lethrinus erythropetrus, Balistapus undulatus, Gymnocranius microdon, Plectropomus leopardus, and Priacanthus meeki. All fish species contain heavy metals lead (Pb) and copper (Cu), this can be caused by activities carried out by local communities that can disturb water conditions and have an impact on fish, In the Chi-square analysis that has been carried out on water quality at each station on Miang Island, the results obtained water quality gives an influence on heavy metals in the bodies of reef fish that have been caught in this study. This can be caused by water quality that is affected by heavy lead (Pb) and copper (Cu) from human activities in these waters, such as ship loading and unloading activities, and ship transportation routes.