Marine Fisheries : Journal of Marine Fisheries Technology and Management
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Analysis of Ship Motion Response to Hull Line Redesign of The Manado Prototyped Small Purse Seiner
No full textHull line determines the ship motions in adapting to the ocean conditions, and therefore, ships require a flexibly appropriate hull line to have a highly safe sailing trip. This study aims to determine influence of small purse-seiner hull line redesign on the ship\u27s motion, namely rolling, heaving, and pitching which can be observed as a Response Amplitude Operator (RAO) due to the sea conditions. The hull lines were redesigned by manipulating the ship\u27s breadth (B) and depth (D) based on the Manado prototype, resulting in three new hull forms (ships B, C, D) and one prototype control (ship A). Data input and simulation used the Maxsurf Modeler Advanced and Maxsurf Motions Advanced applications to analyze motion responses at different wave angles (head sea 180°, bow quartering sea 135°, and beam sea 90°) under average load and service speed conditions. The findings demonstrated that each ship had a unique RAO for heave, roll, and pitch motion. In heave and pitch motion, ship D had a best RAO, but in roll motion, ship C had the best RAO. The rolling and pitching motions of all ships have met the minimum standard of the general operability limiting criteria for ships at all conditions, while the rolling motion at the wave coming of 90° was met at the slight and moderate conditions.
Keywords: Heaving motion, North Sulawesi-Indonesia, pitching motion, rolling motion, ship motio
TECHNICAL EFFICIENCY AND PRODUCTION SCALE ANALYSIS IN SMALL-SCALE TUNA HANDLINE FISHERIES IN WEST SULAWESI
No full textTuna fishing activity in West Sulawesi has intensified in recent years, raising concerns regarding the sustainability of the fishery in the Makassar Strait amid increasing fishing pressure. This study evaluates the capacity utilization and resource use efficiency of small-scale handline vessels by measuring their technical and scale efficiency. A total of 78 tuna handline vessels were analyzed using an output-oriented Data Envelopment Analysis (DEA) model under Variable Returns to Scale (VRS), covering two vessel categories: <5 GT and 5–10 GT. Vessel samples were selected through stratified random sampling from the Banggae and Tinambung sub-districts. The results show that vessels in the 5–10 GT category exhibit higher technical efficiency in utilizing production inputs and fishing capacity, while vessels smaller than 5 GT tend to operate closer to the optimal scale, with most exhibiting increasing returns to scale (IRS). These findings highlight that efficiency improvements in the small-scale segment could be achieved through targeted technological assistance and training, particularly among smaller vessels (<5 GT), while capacity management remains essential in larger vessels (5–10 GT) to prevent excessive fishing effort. Integrating efficiency-based management insights with Indonesia’s Measured Catch Policy is critical to support the sustainability of tuna fisheries in the region.
Keywords: DEA, scale efficiency, small-scale fisheries, tuna fishing, technical efficienc
Enhancing Fisheries Sustainability Through Supply Chain Efficiency with Business Intelligence (Machine Learning) at Auction Sites
No full textThe fisheries industry faces complex challenges in supply chain efficiency that impact sector sustainability and the welfare of fishermen. This study aims to analyze the implementation of machine learning-based business intelligence systems to improve supply chain efficiency at Palang Fish Auction Place (TPI), Tuban Regency. The research method employs a mixed-methods approach, combining qualitative methods through in-depth interviews with fisheries stakeholders with quantitative methods using linear regression models to predict fish catch volumes for the 2022-2024 period. Qualitative data analysis employs the Miles & Huberman framework, which involves data reduction, data presentation, and conclusion drawing. In contrast, quantitative data is evaluated using metrics such as MAE, MAPE, and RMSE. The results reveal five primary factors influencing supply chain efficiency: catch volume with distinct seasonal patterns, auction price stability influenced by demand and import policies, distribution constraints resulting from inefficient payment systems, significant weather and environmental impacts, and the potential for technology adoption with positive acceptance among fishermen. The machine learning model successfully predicts catch volume with increasing accuracy from MAPE 18.5% (2022) to 12.8% (2024). The implementation of machine learning-based business intelligence systems has proven capable of improving fisheries supply chain efficiency, stabilizing fish prices, reducing resource waste, and supporting the sustainability of the fisheries sector in accordance with the Sustainable Development Goals.
Keywords: Business intelligence, fish auction place, fisheries, machine learning, supply chain efficienc
EFFICIENCY OF HANDLINE TUNA FISHERMEN\u27S WORKING TIME USING THE PERT APPROACH
No full textHandline tuna fishing constitutes one of the key economic activities in coastal areas, particularly for small-scale fishermen. Efficient working time plays a vital role in improving fishermen’s productivity and income. However, in practice, tuna fishing operations frequently encounter inefficiencies in both planning and the execution of daily tasks. Therefore, an analytical method is required to identify and evaluate each stage of the work process systematically. The Program Evaluation and Review Technique (PERT) provide a structured approach to mapping work activities, estimating the time required for each task, and identifying the critical path that determines the total project duration. This study aims to evaluate the efficiency of working time utilization among tuna fishermen using handline gear by applying the PERT approach. The research was conducted on 163 fishing vessels using the PERT (Project Evaluation and Review Technique) method, focusing on the analysis of actual time allocation for each activity. The results indicate that of the 24 analyzed activities, 17 (70.83%) fall within the critical path, while 7 (29.17%) have slack time. Critical activities such as loading supplies, traveling to the fishing ground, and retrieving the parachute anchor determine the project’s minimum duration. Meanwhile, activities with slack time, such as preparing the parachute anchor and mooring the vessel to the fish aggregating device (FAD), can be performed flexibly without affecting the overall project timeline. Effective time management is essential to ensure that each operational phase is completed on schedule, thereby improving the efficiency and productivity of fishing operations.
Keywords: critical path, handline, PERT, tuna
IMPLEMENTATION THE CODE OF CONDUCT FOR RESPONSIBLE FISHERIES IN PURSE SEINE OPERATIONS AND CATCH HANDLING
Get PDFThe purse seine is one of the primary fishing gears used to land pelagic species at the Nusantara Fishing Port, Prigi. The adoption of environmentally responsible fishing practices is critical to minimizing bycatch, preventing habitat degradation, and preserving pelagic fish stocks. This study assessed the operational performance of small pelagic purse seines and catch-handling practices in relation to the CCRF. Fieldwork was conducted from February to May 2025 using purposive sampling, supported by observations and interviews with purse seine fishermen, including the stages of onboard and landing-site handling. A scoring system was applied to evaluate each indicator, and gap analysis was used to identify deficiencies in the handling system on KM. Sinar Mutiara. A total of 25 fishermen and 25 community respondents were surveyed, yielding an average score (X̅) of 28.78, indicating limited compliance with sustainable fisheries resource management principles. Variation in adherence to CCRF handling standards further reinforces this finding. While post-harvest handling at the auction site showed relatively better alignment with CCRF provisions, notable gaps remain in onboard and landing-site operations. These results underscore the need for targeted improvements to enhance compliance and support the transition toward more sustainable purse seine fisheries in Prigi.
Keywords: CCRF, handling of ctach, Prigi fishing port, purse sein
ESTIMATING SUSTAINABLE EFFORT RATES FOR SKIPJACK TUNA FISHERIES LANDED AT YOGYAKARTA’S COASTAL FISHING PORT USING THE FOX MODEL
Get PDFThis study aims to estimate the fishing effort for skipjack tuna (Katsuwonus pelamis) landed at Sadeng Coastal Fishing Port, Yogyakarta, under three management conditions: Maximum Sustainable Yield (MSY), Maximum Economic Yield (MEY), and Open Access Equilibrium (OAE), using the Fox model. The Fox model includes a key variable that helps balance ecological sustainability with economic profitability, ensuring the long-term viability of both the fishery and the livelihoods it supports. The skipjack tuna assessed in this study were caught using purse seines in the Indian Ocean south of Yogyakarta. Catch and fishing trip data from 2015 to 2021 were analyzed using the Fox bioeconomic model, a development of the Gordon-Schaefer model. The research was conducted from March to May 2022. Under MSY conditions, the estimated catch (CMSY) was 493,012 kg with an effort (EMSY) of 170 trips per year, yielding an annual profit of IDR 4,768,675,442. Under MEY conditions, the estimated catch (CMEY) was 474,424 kg with an effort (EMEY) of 127 trips, resulting in a higher annual profit of IDR 5,071,245,038. Under OAE conditions, the estimated catch (COAE) was 337,761 kg with an effort (EOAE) of 363 trips per year. Based on the Fox model, the current fishing effort is at 70% of EMSY, indicating that the skipjack tuna fishery in this area is not overfished.
Keywords: Bioeconomic, EMSY, purse seine,Sadeng, Indian Ocea
EXPLORING GLOBAL TRENDS AND FUTURE PROSPECTS IN FISHING TECHNOLOGY RESEARCH: AN INNOVATIVE BIBLIOMETRIC APPROACH
Get PDFFishing technology has undergone rapid development in response to sustainability challenges; however, a comprehensive global synthesis of its research progress and future directions remains lacking. To address this gap, this study explores global trends and prospects in fishing technology research using an innovative bibliometric approach. A total of 164 Scopus-indexed documents published between 2009 and 2023, authored by 179 researchers across 33 countries, were analyzed. Bibliometric analysis was conducted using the Biblioshiny application in the Bibliometrix R package, complemented by knowledge domain visualization (KDV) to map scientific structures, collaboration networks, and citation patterns. The results indicate an annual publication growth rate of 12.3%, reflecting increasing global interest in fishing technology. China was identified as the most productive country, with the strongest record of international collaboration, while Cooke SJ emerged as the most influential scholar, with a PageRank score of 0.0204 and accounting for 18.25% of global citations. Keyword mapping revealed research hotspots centered on sustainable development, selective fishing gear, and the integration of digital technologies, including artificial intelligence and electronic monitoring. This study concludes that bibliometric synthesis not only provides a strategic overview of global knowledge gaps and thematic evolution but also highlights the critical role of interdisciplinary collaboration and technological innovation in shaping the future of sustainable fisheries management.
Keywords: Bibliometrics analysis, fisheries, fishing technolog
STAKEHOLDER PERSPECTIVES ON MANAGING ABANDONED, LOST, OR DISCARDED FISHING GEAR IN REMBANG CRAB FISHERIES
Get PDFAbandoned, lost, or discarded fishing gear (ALDFG) poses a significant threat to natural marine habitats, causing damage to aquatic ecosystems and affecting fishing productivity. In this study, the Analytic Hierarchy Process (AHP) method was employed, and interviews were conducted with stakeholders to identify strategies for preventing the occurrence of ALDFG in crab fisheries in Rembang waters. The results indicate that the highest-priority criteria, as identified by stakeholders, include: marine debris: plastic bags; fishing gear waste: fishing traps; cause: entanglement with other fishing gear; impact: decreased income; solution: prohibition of modified purse seines; and actor: central government. These were considered the most significant by stakeholders. In contrast, the lowest-priority criteria were marine debris: sacks; fishing gear waste: nets or flags; cause: physical damage (cuts); impact: anxiety; solution: establishment of an oversight committee; and actor: business entities. It is hoped that these findings will offer stakeholders new insights and perspectives, which will accelerate the process of integrating diverse public opinions to develop more effective approaches to handle ALDFG.
Keywords: Analytic Hierarchical Process, Abandoned, lost, or discarded fishing gear, Crab fisherie
IDENTIFICATION OF ACTORS AND MARKETING MARGINS OF PROTECTED FRESHWATER STINGRAYS IN MUSI RIVER, SOUTH SUMATERA
Get PDFThe Musi River in Palembang, South Sumatra-Indonesia, serves as the habitat for three protected freshwater stingray species: the marbled whipray (Fluvitrygon oxyrhynchus), the white-edge whipray (Fluvitrygon signifier), and the giant freshwater whipray (Urogymnus polylepis). All three species are categorized as endangered on the IUCN Red List and are listed under Appendix II of CITES. However, communities along the Musi River continue to trade freshwater stingrays freely in local markets. This research aims to identify the economic potential of the freshwater stingray trade, which is suspected to drive illegal capture, by analyzing its supply chain and estimating its marketing margins. Descriptive analysis and marketing margin analysis were employed to address the research objectives. The findings indicate that the freshwater stingray trade in the Musi River involves a short supply chain and covers a wide range of capture areas. Positive marketing margins ranging from IDR 17,000 to IDR 60,000 per kilogram for the white-edge whipray and the giant freshwater whipray, and up to IDR 200,000 per individual for the marbled whipray, provide empirical evidence that freshwater stingrays contribute to the income of the market actors, thereby potentially encouraging the trade of protected species and potentially driving illegal trade.
Keywords: Conservation, illegal trade, ornamental fish, protected species, wildlife traffickin
USE OF BLUE LED LIGHTS AS AN ATTRACTANT IN A COLLAPSIBLE POT ON BLUE SWIMMING CRAB CATCHES
Get PDFBlue light-emitting diode (LED) lights have been tested as a potential tool in a blue swimming crab collapsible pot at the laboratory level. However, field-scale trials have not yet been conducted to confirm their effects on pot catches. This study aims to determine the effects of blue LEDs on catch composition and the effectiveness of catching the main target of crab (Portunus pelagicus). A fishing trial was conducted in Brondong, Lamongan waters to examine the influence of blue LED lights on crab catches. A total of 54 pots were deployed, consisting of 18 pots with fish bait (U) as control, 18 pots with blue LED light (L), and 18 pots with a combination of fish bait and blue LED (LU). The results showed that the LU treatment yielded the highest number of species, with a total of 13 species, followed by the U treatment, with 10 species, and the L treatment, with 9 species. The LU treatment had the highest catch of 48 fish (3,718 g), followed by U with 43 fish (3,448 g) and L with 5 fish (208 g). Statistical analysis revealed no significant differences between the LU and U (control) treatments in terms of both catch number and weight. The highest catchable width distribution in treatment U was 88%, while the highest catchable weight distribution in treatment LU was 75%. The analysis of crab-catching effectiveness analysis showed that the LU treatment had the highest average effectiveness of 13%, followed by the U treatment at 11%, and the lowest was the L treatment at 1%. In conclusion, LED lights do not affect the catch, however, adding LED lights to the bait can increase the number of species caught, the number of individuals, the weight of the catch, and the effectiveness of catching kingfish (P. pelagicus).
Keywords: Blue light, catchable distribution, effectiveness, bai