Marine Fisheries : Journal of Marine Fisheries Technology and Management
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OPTIMIZING JULUNG-JULUNG (Hemiramphus sp.) FISHERY USING SURPLUS PRODUCTION MODELS iN EAST SERAM
Get PDFThe julung-julung (Hemiramphus sp.) fishery in eastern Seram waters is an important livelihood resource for coastal communities, yet it is increasingly exposed to high exploitation pressure driven by intensified fishing and coastal habitat degradation. This study assesses the stock status and identifies optimal management strategies using a surplus production modelling approach. Catch (tons) and fishing effort (number of trips) data from 2014–2024 were analyzed using the Schaefer and Fox models. Model comparison showed that the Fox model provided a better fit to the observed data, with an R² of 76.0%, compared with 73.3% for the Schaefer model. Based on the Fox model, the estimated maximum sustainable yield (MSY) was 945.7 tons per year, with an optimal fishing effort (Eopt) of 2,365 trips per year. The declining trend in catch per unit effort (CPUE), despite continued increases in fishing effort, indicates reduced fishing efficiency and suggests that the stock is already experiencing overfishing. These results demonstrate that the julung-julung fishery in eastern Seram waters is under overexploitation and requires urgent management intervention. Effort regulation aligned with Eopt, together with ecosystem-based and participatory management approaches, is recommended to support recovery and long-term sustainability. The findings provide evidence-based guidance for strengthening policy development and management of small-scale, data-limited tropical fisheries, particularly those facing similar ecological and socioeconomic pressures.
Keywords: Hemiramphus sp., MSY, CPUE, Fox model, fisheries managemen
DESIGN AND IMPLEMENTATION OF PIEZOELECTRIC TRANSDUCER TO IMPROVE FISHING EFFICIENCY ON BAGAN BOAT
Get PDFThe decline in fish catches among bagan boats in Labuhan Jambu, Sumbawa District, is caused by overfishing, illegal fishing, and climate change. To address this issue, technological innovations such as sonar systems that emit acoustic signals to attract fish are necessary. This study aims to design piezoelectric transducers and transmitter drivers capable of emitting acoustic frequencies that effectively attract fish around bagan boats, thereby increasing catch yields. The methodology included system design, fabrication, and testing. The developed transducer operates across a frequency range of 1–75 kHz, and field tests were carried out by installing the transducer beneath the bagan boat. Results indicated that fish responded quickly to frequencies between 500–800 Hz, as evidenced by the appearance of bubbles on the water surface, suggesting fish presence. The main species caught included pelagic fish, skipjack, and squid. Fish catches increased by approximately 2–3 times compared to conventional methods. The transducer and transmitter driver using piezoelectric materials were successfully developed and functioned effectively. The final prototype was capable of emitting acoustic frequencies from 1 Hz to 100 kHz. This innovation demonstrates the potential of piezoelectric transducer technology to significantly enhance fish catches in bagan boat operations in Labuhan Jambu.
Keywords: Driver transmitter, bagan boat, piezoelectric, transduce
THE IMPLEMENTATION STRATEGY OF THE SUSTAINABLE FISHING PORT CONCEPT AT CILACAP OCEAN FISHING PORT
Get PDFThe ecoport concept, or environmentally port management, is a sustainable development approach that integrates social, economic, and environmental aspects. This concept has been adopted in several developed and developing countries. In Indonesia, the ecoport concept has been applied to fishing ports, known as eco-fishing ports since 2013. However, the Cilacap Ocean Fishing Port (PPS Cilacap) was not selected as a pilot site that year, despite having adequate infrastructure and active fishing operations that meet the assessment parameters outlined in the National Fishing Port Master Plan. This study aims to identify the strengths, weaknesses, opportunities, and threats (SWOT) related to environmental management and the socio-economic conditions of the local community, in order to formulate strategies for implementing a sustainable eco-fishing port at PPS Cilacap. Strategy development was carried out using a SWOT analysis based on observations, interviews, and questionnaire surveys. The results indicate that PPS Cilacap possesses strengths such as good environmental conditions and competent human resources, but it also faces challenges, including poorly maintained facilities, waste management issues, and limited financial resources. In conclusion, although PPS Cilacap demonstrates favorable environmental conditions and skilled personnel, improvements in maintenance, waste handling, and budget allocation are needed. Enhancing infrastructure, fostering partnerships, and advancing sustainability initiatives will be crucial to the successful implementation of the eco-fishing port concept.
Keywords: Cilacap Ocean Fishing Port, eco fishing port, opportunities, strengths, threats, weaknesse
DAILY OCCURRENCE OF WHALE SHARKS (Rhincodon typus) AND MIGRATION OF NEW INDIVIDUALS IN THE WATERS OF KWATISORE
Get PDFThe waters of Kwatisore are recognized as a consistent aggregation site for whale sharks (Rhincodon typus) throughout the year, with an increasing number of individuals observed. Understanding individual occurrence patterns is essential for monitoring population dynamics and conservation planning. This study aimed to analyze the daily occurrence of whale sharks based on individual identification and assess the entry of new individuals into the Kwatisore waters. Data collection was conducted from November 2023 to January 2024. A total of 27 male individuals were recorded, with a cumulative 592 sightings. Body lengths ranged from 2.5 to 5 meters, dominated by individuals approximately 3.5 meters in length. Spatial distribution of daily occurrences followed the positioning of anchored lift-net fishing gear (bagan), while temporal distribution showed a higher occurrence during morning hours. In 2023, 13 new individuals were recorded entering the area. The daily appearances were dominated by juvenile-sized individuals, and sighting frequency varied among individuals. Spatial and temporal patterns were strongly influenced by anchovy (Stolephorus spp.) catches from the bagan gear, while the entry of new individuals contributed to the growing aggregation of whale sharks in the Kwatisore waters.
Keywords: whale sharks, daily occurrence, new individual migratio
ESTIMATION OF WASTE AND ITS MANAGEMENT STRATEGIES IN THE MODERN FISH MARKET OF MUARA BARU JAKARTA
Get PDFModern Fish Market is one of the main fish marketing and culinary tourism centers located in Muara Baru, Jakarta, specifically within the Nizam Zachman Ocean Fishing Port area. The market faces environmental challenges related to solid waste, particularly the mismanagement of inorganic waste. This study aims to estimate the amount and economic value of waste produced, compare existing waste management practices with SNI-19-2454-2002, and formulate appropriate waste management strategies for Modern Fish Market. The research was conducted using a case study approach, and respondents were selected through accidental sampling and purposive sampling techniques. Data were analyzed using descriptive analysis, gap analysis, and SWOT analysis. The results showed that waste generated from fish marketing activities at PIM consisted of 3.95% organic waste and 96.05% inorganic waste, with the economic value of inorganic waste reaching Rp1,559,000 per day. In terms of waste management, two aspects were found to be inconsistent with SNI-19-2454-2002. Six strategies were recommended to improve waste management at Modern Fish Market, with priority actions including the preparation of technical guidelines aligned with SNI-19-2454-2002 and expanding cooperation with recycling industries.
Keywords: recycling, organic waste, inorganic waste, SNI-19-2454-2002, Nizam Zachma
THE SELECTIVITY OF FISH TRAP ESCAPE GAP SIZE ON BOTANA FISH (Acanthurus reversus)
Get PDFFish trap is used due to its good prospect, particularly for demersal fish and reef fish in Maluku. A challenge of trap fisheries is the capture of various species of fish, along with a narrow size variation in the captured fish. To reduce the species diversity in the catch and allow the escape of young fish, an escape gap is recommended. This study aims to analyze the effect of different escape gap sizes on the fish that escape and their chances of being caught or escaping relative to the dominant catch. The study was conducted from July to September 2021 in the waters of Eri Village, Nusaniwe District, Ambon City, Indonesia. The experimental fishing method was used in the field. The results indicated that the size of the escape gap had no effect on the number of fish that escaped through each escape gap. The 50% probability of Achanturus reversus escaping from the size 2.0 cm escape gap is in the total length range of 21-22 cm, while from a 3.0 cm escape gap is 24-25 cm.
Keywords: Fish pot, escape gap, selectivit
MODIFIKASI DINDING BUBU LIPAT UNTUK MELOLOSKAN RAJUNGAN YANG BELUM LAYAK TANGKAP: Collapsoble Trap Wall Modification to Realease Under Size Blue Swimming Crab
Get PDFIncreasing of fishing pressure poses a serious threat to the sustainability of blue swimminng crab resources. Trap design modifications are needed to improve size selectivity and to release under size crabs. This study aimed to determine the type of wall modification of collapsible trap that is effective in excluding under size blue swimming crab. Laboratory observations were conducted using four escape vents treatments and three different mesh sizes. The escape gap used are rectangular, square, circular and oval respectively. Moreover, the mesh sizes used are 2.0 inches, 2.5 inches and 3.0 inches. Descriptive analysis and scoring were used to determine the most effective type of wall trap modification to be used in the blue swimming crab fishing. The results showed that the rectangular escape gap has better effectiveness than other shapes with the percentage of crabs that pass through at 86.7%. The wall modification using a 3.0-inch mesh size had better performance than the other modification types with a total score of 19. Collapsible trap with a 3.0-inch mesh wall was able to escape 86.7% of the crabs with an escape time of only 11.2 seconds and an average escaped crab carapace width of 78 mm.
Keywords: Collapsible trap, escape gap, environmentaly-frendly fisheries, mesh size of trap wal
MODEL PERAMALAN JUMLAH TANGKAPAN IKAN KAKAP YANG DIDARATKAN DI PPI OEBA KUPANG NUSA TENGGARA TIMUR: Forecasting Model for the Snapper Catches Landed at PPI Oeba Kupang, East Nusa Tenggara
Get PDFSnapper is one of the economically important fish targeted by fishers in the island of Timor. Domestic and foreign markets for fillet and fresh snapper is considerably large. The export volume in 2021 was 4,172,056 kg, and the total value reached 12,452,211 USD. Along with the increasing snapper production in Kupang City and NTT, it is necessary to forecast the future snapper production. Thus, it can be a reference for policy makers in the region in designing fisheries development. This study aims to produce forecasting model for snapper catches at PPI Oeba Kupang. This research applied Autoregressive Integrated Moving Average (ARIMA) and Seasonal Autoregressive Integrated Moving Average (SARIMA), as a forecasting method. The data of snapper production analyzed in this study consisted of 72 months, started from January 2016 to December 2021. Data were obtained from the UPT of the Department of Marine and Fisheries of NTT Province at PPI Oeba Kupang. Data have a non-stationary pattern to the variance, hence a logarithmic transformation is needed, as well as seasonal differences analysis. However, there is no need for non-seasonal differences since the data are stationary with respect to the mean. The results of the identification of the Autocorrelation function and Partial Autucorrelation function Plots are ARIMA models with seasonal factor period 4, ARIMA (P,D,Q) = (1,0,1), while the SARIMA order (P, D, Q) = (2,1,1)4. Based on parameter testing, verification, examination, and testing of suitable models, the best model obtained was (0,0,1)(2,1,1)4.
Keywords: Autoregressive Integrated Moving Average, focecasting model, Seasonal Autoregressive Integrated Moving Average, Snapper
POTENSI LESTARI DAN STATUS PEMANFAATAN IKAN TONGKOL (Auxis thazard) DI PERAIRAN MALUKU TENGAH: Maximum Sustainable Yield (MSY) and Utilization Status of Mackerels Tuna in Central Maluku Waters
Get PDFFishery resources are open access and often considered as common property. This can lead to a decrease in the quality of fish resources and economic rents. This study aims to calculate the maximum sustainable yield (MSY) and to determine the exploitation status of mackerel tuna (Auxis thazard) in Central Maluku Regency water. Analysis of MSY was conducted using the Walter Hilborn and Schaefer models. It is revealed that the main fishing gear for mackerel tuna fishing in Central Maluku is purse seine which in the MSY analysis are classified as standard fishing gear. The results show that the maximum hMSY and eMSY are 17,329 tons/year and 3,055 trips/year respectively. The utilization status is at the fully-exploited level.
Keywords: Fully-exploited of mackerel tuna, mackerel tuna, maximum sustainable yield, production of mackerel tuna, model Schaefer
HULL REDESIGN AND ITS EFFECT ON THE RESISTANCE OF MANADO PROTOTYPE SMALL PURSE SEINER: Rancang Ulang Desain Lambung dan Pengaruhnya terhadap Tahanan Gerak Kapal Pukat Cincin Kecil Manado
Get PDFThis research aims to determine the effect of redesigning the hull of a small purse seine ship on its motion resistance. The research was carried out using a small purse seine ship prototype in Manado by changing the length-breath-depth ratio based on the main dimensions of the ship, resulting in three new hull designs coded K-0 (prototype), K-1, K-2, and K- 3. Maxsurf modeler and Maxsurf resistance were used to run a simulation set of three loading conditions (light, half, full) and speed (low, medium, high). The research results show that changes in ship hull design affect the resistance and thrust of the ship. There is a difference in resistance between the ship with the redesigned hull and the prototype, where the smallest difference is shown by K-3. In addition to changes in hull design, changes in ship loading conditions, Froude number, and ship speed lead to increases in ship resistance and thrust. Based on the average allowance (sea margin or service margin) in shipping lanes, the need for propulsion power and the number of propulsion power vessels K-0 (prototype) and K-3 are still better than K-1 and K-2.
Keywords: purse-seiner, resistance, speed, propulsio