Fisheries Management Area Research Articles

Population dynamics of grey mackerel fish (Thunnus tonggol) caught in fishery management areas (WPP 711)

Grey mackerel is a fish that originates from tropical and subtropical waters worldwide. This pelagic fish has very important economic value in the Indonesian fishing industry. Grey mackerel production in WPP 711 using gillnet fishing gear has shown a fluctuating trend in recent years. This research is to estimate the stock of grey mackerel fish caught by fishermen who landed at PPN Pemangkat and Sungai Rengas Fishing Port. This research uses two data collection methods, namely primary and secondary data collection. The results of data analysis of the relationship between length and weight in the catch of grey tuna fish of 1,015 total fish samples produced the equation W = 0.0929x2.5504 (r2 = 0.8764) with a value of 0.0929 and the b value of 2,5504. Based on the results of the t-test, it shows that the value of b 3 in the growth pattern is negative allometric, meaning that the relationship between length and weight has a slow and rapid increase in weight compared to the increase in length. The landed grey mackerel had a growth rate coefficient (K) = 0.40. Tuna fish obtained a total mortality value (Z) of 1.81/ year. The exploitation rate (E) of grey tuna caught is 0.28/ year, which means the exploitation rate is still relatively low.Keywords: Gray mackerel; Pelagic Fish; Population dynamics; WPP 711Grey mackerel is a fish that originates from tropical and subtropical waters worldwide. This pelagic fish has very important economic value in the Indonesian fishing industry. Grey mackerel production in WPP 711 using gillnet fishing gear has shown a fluctuating trend in recent years. This research is to estimate the stock of grey mackerel fish caught by fishermen who landed at PPN Pemangkat and Sungai Rengas Fishing Port. This research uses two data collection methods, namely primary and secondary data collection. The results of data analysis of the relationship between length and weight in the catch of grey tuna fish of 1,015 total fish samples produced the equation W = 0.0929x2.5504 (r2 = 0.8764) with a value of 0.0929 and the b value of 2,5504. Based on the results of the t-test, it shows that the value of b 3 in the growth pattern is negative allometric, meaning that the relationship between length and weight has a slow and rapid increase in weight compared to the increase in length. The landed grey mackerel had a growth rate coefficient (K) = 0.40. Tuna fish obtained a total mortality value (Z) of 1.81/ year. The exploitation rate (E) of grey tuna caught is 0.28/ year, which means the exploitation rate is still relatively low. Keywords: Gray mackerel; Pelagic Fish; Population dynamics; WPP 711

ANALYSIS Catch Per Unit Effort (CPUE) AND Maimum Sustainable Yield (MSY) MALE MACKEREL (Rastrelliger kanagurta) FLYING IN THE SAMUDERA FISHING LAND (PPS) KENDARI

The Banda Sea is an Indonesian water body that holds potential for small pelagic fisheries resources. Situated between Sulawesi Island and Maluku, it is part of the Fisheries Management Area Of The Republic Of Indonesia (WPP-NRI 714), Male mackerel (Rastrelliger kanagurta) is one of the fish species with high economic value, greatly favored by the community for consumption. This has led to an increase in its capture rates. Therefore, the research aims to determine the CPUE and MSY of Indian mackerel in the Kendari Ocean Fisheries Port. Data collection was conducted at the Kendari Ocean Fisheries Port from logbooks, and the research lasted from November to December 2023. The results showed that the standard fishing gear used to catch these fish is purse seine. The status of the utilization of the fishery resources is said to be experiencing underfishing. Based on the research results, the maximum sustainable yield (MSY) is 96,386 kg/year, with an optimal fishing effort of 2,300 trips/year (Fox model).

Contribution of legal architecture toward strengthening co-management platforms in small-scale fisheries in Sri Lanka

The importance of a robust and supportive legal framework to encourage community involvement in resource management is undeniable. The legal landscape of Sri Lanka's fisheries sector is examined in this paper, with a specific focus on co-management - a collaborative approach involving fishers, government agencies, and other stakeholders for sustainable fisheries management. A systematic review of relevant Acts, Regulations, and other related literature explores how the existing legal framework enables the establishment and function of co-management platforms. The appropriateness and sufficiency of current legal provisions towards implementing "co-management good practices" outlined in the FAO's Assessment Sheet for co-management design and performance and the practical application of legal provisions aimed at promoting co-management are also examined. The Fisheries and Aquatic Resources Act No. 35 of 2013 emerges as the cornerstone legislation supporting co-management. Particularly significant is the provision for establishing Fisheries Management Coordinating Committees within designated Fisheries Management Areas. These Fisheries Coordinating Committees include representatives from village-level Fisheries Management Committees, government bodies, and key stakeholders appointed by the Director General of the Department of Fisheries and Aquatic Resources. This represents a crucial step towards collaborative management of fisheries resources. The analysis reveals satisfactory compliance of existing legal provisions with the FAO's "co-management good practices". However, some deficiencies and practical limitations have been identified. For instance, there is no legal mandate to make Fisheries Management Committees or Fisheries Coordinating Committees compulsory within designated Fisheries Management Areas, nor is there a requirement for regular meetings. While the legal framework generally supports co-management, there is substantial room for improvement. The paper recommends that the government should address legal and administrative challenges that hinder the effective implementation of co-management initiatives.

Export demand patterns for blue swimming crab from Indonesia to United States : impact of fishing seasons in FMA 712 (2018 to 2022)

Abstract Blue swimming crab (Portunus pelagicus) is a significant fishery export commodity from Indonesia, especially the fisheries management area (FMA) 712. The aim of this study was to analyze the relationship between export demand and fishing season in FMA 712 during the last five years (2018–2022) based on export volume, prices, and fishing season information. Fishing season in Indonesia was classified as the west season with high rainfall (November to May) and the east season with low rainfall (June to October). The data were analyzed by correlation and trend analysis. The results showed that the export demand for blue swimming crab fluctuated with the fishing season. Demand for blue swimming crab tends to increase in the west season due to abundant supply from a favorable fishing season, leading to decreased prices due to international market competition. Conversely, demand for blue swimming crabs declines in the east season due to reduced supply from an unfavorable fishing season, resulting in increased prices due to limited availability. To address fluctuations, market diversification, product quality improvement, and sustainable fishery resource management are essential to balance profitable exports and marine preservation. Other variables that may influence export demand, such as global economic and political factors, were not included in this analysis.

Social-ecological system (SES) mapping of spiny lobster (Panulirus sp.) fisheries in Nasal Coastal Water, Bengkulu

Abstract Nasal coast is one of the areas with a fishing sector that includes lobster fishing and falls under the Indonesian Fisheries Management Area 572 (IFMA 572). However, little information on lobster fishery system in this area. This research aims to map the social-ecological system (SES) for the pronghorn spiny lobster (Panulirus penicillatus) in Nasal District, Kaur Regency, Bengkulu. This study conducted from November 2022 to February 2023 using a social-ecological system (SES) approach. The study refers that there are 34 nodes and 55 edges in the lobster fisheries connectivity parameter. The main elements in the lobster fisheries network are fishermen, fishing activity, weather, cost, fishing season, water quality, lobster, catch per unit effort, macro collectors, revenue, and catch. Those components are important in the dynamics of the SES lobster fisheries network (Panulirus spp.) in the coastal waters of Nasal District.

Population structure of longtail tuna (Thunnus tonggol) within and across Indonesia’s fisheries management areas (FMAs) and neighboring countries based on mitochondrial control region

Longtail tuna (Thunnus tonggol), one of the neritic tuna species commonly found in the coastal areas of the Indo-Pacific region, is known to be in an overfishing state in certain areas, including in Indonesia. Understanding the condition of the T. tonggol population within Indonesia is very important in managing its fisheries policy. This research aims to understand the population genetic structure of T. tonggol across Indonesia's Fisheries Management Areas (FMAs), as well as to investigate the phylogeography of T. tonggol within the Indo-Pacific region. A total of 586 samples were collected from 18 locations within Indonesia’s six FMAs, and two locations from Malaysian waters. A 520 bp portion of mtDNA control region was amplified and sequenced. Data analysis was conducted using 586 total sequences generated from this study, and 336 sequences retrieved from GenBank, as well as provided by the author of previous study. Population structure analysis indicated a panmictic population of T. tonggol within six Indonesian FMAs and within the neighboring countries (Malaysia, Andaman Sea, Vietnam, Philippines, and India), with an indication of population expansion. These data do, however, reveal two potentially distinctive clades, one showing an affinity among samples from certain parts of Indonesia (East Aceh, West Aceh, Medan - FMA571 & FMA572) and India. Based on this finding, the T. tonggol fisheries should be managed as a single management unit both within Indonesia’s FMA and within neighboring countries, while also emphasizing localized genetic diversity to protect the sustainability of the species and its fishery.

Examining fishing activities based on in-situ tracking and oceanographic characteristics in Aru Sea and surroundings

Fisheries activites and oceanographic conditions have a strong relationship. Understanding the complex interplay between fisheries and oceanographic conditions is essential for effective fisheries management. The aim of this research is to analyze the in-situ fishing activities with oceanographic conditions in the Fisheries Management Area (FMA) or WPP-NRI 718 located in the Aru Sea and its surroundings. The main data source is from open global data ship tracking and oceanographic conditions from satellite data. In general, fishing is conducted around the waters of Aru Island. The fishing grounds are strongly influenced by a combination of environmental factors, including sea surface temperatures, chlorophyll-a (Chlor-a) concentrations, sea surface height, and current velocities. A decrease in fishing patterns around Aru Island waters occurs in the eastern season, where fishing tends to occur in the western region (near Timor-Leste). Based on the oceanographic conditions, fishing tends to occur in regions with warmer conditions ranging from 27 to 29 °C, moderate Chlor-a (1.02–3.01 mg/m3), a relatively high surface height (0.17–0.32 m), and slow surface currents.

Analysis of Fish Supplies at the Poumako Fishing Port, Mimika Regency, Central Papua Province - Indonesia

One of the feeder ports in Fisheries Management Area (FMA) 718 is the Poumako fishing port in Central Papua Province, which encompasses fishing grounds in the sea of Aru, Arafuru, and Eastern Timor. As a supply of fish for different consumer locations on the island of Java, the port is crucial to Indonesia's marine fisheries supply chain. Therefore, in fisheries management policies at FMA 718, it is necessary to predict fish catches as assessment materials. This research aims to analyze the availability of fish supplies at the Poumako Fishing Port. Secondary data from the Ministry of Maritime Affairs and Fisheries (MMAF) provided the production of fish that landed between January 2018 and October 2023 for analysis. In addition, secondary data from the Poumako Fishing Port and interviews with port management were used to reveal the dynamics of fish supply at the Fishing Port. Data was analyzed descriptively. Fish catch predictions were investigated by the Triple Exponential Smoothing method. The research results show that Poumako Fishing Port has significant roles in the local and national fish supply chains. The trend of fish catches landed at Poumako Fishing Port is parabolic. There is a trend of increasing production in 2018–2021 and decreasing production in 2022–2023. The catch fisheries production is predicted to decline in 2024. Therefore, it is necessary to improve port facilities and management to increase marine fisheries production at the Poumako Fishing Port in the future.

Detection Of The Thermal Front Using The Cayula-Cornillon Alghorithm: A Case Study Of The State Fisheries Management Area 713, Indonesia

Thermal fronts are pivotal in shaping the marine ecosystem, influencing the presence and distribution of marine species. This study delves into the fluctuating patterns of thermal fronts in Indonesian waters, specifically focusing on the State Fisheries Management Area of the Republic of Indonesia, known as WPPNRI, 713. We identified the distribution and frequency of thermal fronts across different monsoon seasons. Utilizing the extended Cayula Cornillon Algorithm – Single Image Edge Detection (CCA-SIED), we deploy a precise methodology for detecting these fronts, relying on sea surface temperature (SST) gradients to identify specific periods and regions. Our analysis encompasses extensive satellite data collected from Moderate Resolution Imaging Spectroradiometer (MODIS) level 3. Our findings unveil distinct seasonal variations, with a decrease in thermal fronts during the west monsoon and a surge during the east monsoon. Moreover, we identify regional disparities, with denser thermal fronts observed in the southern and middle regions compared to the northern areas. Furthermore, our study underscores the critical need to integrate oceanographic data with fisheries management strategies to address the impacts of climate variability on marine resources. The observed relationships between thermal fronts, nutrient distribution, and fish migration emphasize the necessity for ongoing, localized monitoring to develop adaptive management solutions. This research marks a significant step in characterizing thermal fronts in WPPNRI 713, laying the groundwork for future investigations into other ecologically significant fronts, including those related to chlorophyll, salinity, and nutrients, thereby enhancing our understanding of marine ecosystem dynamics.Keywords: Cayula Cornillon; Fishing Zone; Marine Ecosystem; Sea Surface Temperature; Thermal Fronts

Conservation status of sharks and rays caught in Indonesian Fisheries Management Area 712

Abstract. Lelono TD, Bintoro G, Setyanto A, Setyahadi D, Sutjipto DO, Adhihapsari W, Aliviyanti D, Isdianto A. 2024. Conservation status of sharks and rays caught in Indonesian Fisheries Management Area 712. Biodiversitas 25: 2603-2614. Elasmobranchs, including sharks and rays, are some of the most vulnerable marine fish and are particularly at risk from fishing pressure. Sharks and rays landing data that listed in the Convention on International Trade in Endangered Species (CITES) appendices and/or assessed as in The International Union for Conservation of Nature (IUCN) Red List threatened categories were collected from July to October 2023 at two sites in Indonesian Fisheries Management Area (FMA) 712, East Java, Indonesia, namely Pelabuhan Perikanan Nusantara (PPN) Brondong at Lamongan District and Pelabuhan Perikanan Pantai (PPP) Muncar at Banyuwangi. Stingray species designated as Critically Endangered (CR), Endangered (EN), or Vulnerable (VU) were recorded at both landing sites. More IUCN Red List threatened ray species were recorded at Brondong than at Muncar. Based on Brondong's international trade status, ray species landed at Brondong are at higher risk of extinction than those landed at PPP Muncar. Six shark species are currently listed in CITES Appendix II: A pelagicus, A. superciliosus, S. lewini, S. zygaena, C. falciformis, and I. oxyrinchus. At PPP Muncar, two of these species were traded. Sharks landing at Muncar included species in IUCN Red List categories, while those landing at Brondong were in four categories. Two CITES categories regulate the capture of sharks landed at PPP Muncar and PPN Brondong. At both sites, numerous species with conservation statuses of CR, EN, VU, and NT are still caught. In conclusion, exploitation and insufficient control threaten the shark and ray populations in PPP Muncar and PPN Brondong. To save these species, conservation efforts should prioritize trade monitoring, habitat protection, and stricter laws.

Spatial and temporal pattern of thermal front in Republic of Indonesia fisheries management area 571 (FMA 571)

Abstract The spatial pattern of thermal front were obtained by processing sea surface temperature (SST) data using the SIED (Single Image Edge Detection) method. The objective of this research is to establish the characteristics of the surface thermal front in the Republic of Indonesia Fisheries Management Area (FMA) 571 based on its spatial and temporal map in the year of 2010-2020. SST & chlorophyll-a of AquaMODIS satellite imagery and FMA 571 bathymetry of the Indonesian Geospatial Information Agency data are used in this research. This research results that the maximum & the minimum average thermal front are found in the southwest monsoon and the first inter-monsoon with values of 135 and 39 events, respectively. The maximum (minimum) SST average is 32.182°C (30.483°C) and the maximum (minimum) average chlorophyll-a concentration value is 0.858 mg/l (0.577 mg/l). The optimum SST is estimated ranges of 30.483°C – 31.831°C for thermal front formation. The Pearson correlation analysis reveals a significant positive correlation coefficient of 0.674 during the northeast monsoon, highlighting the association between thermal fronts and chlorophyll-a concentration. Spatially persistent thermal front always appears in the northern part of FMA 571.

Influence of Marine Heatwaves on Upwelling Parameter in Indonesian Fisheries Management Area (IFMA) 713 Waters

Abstract An upwelling process linked to water productivity is likely to be affected by marine heatwaves (MHWs). The events of MHWs are distinguished by warmer sea surface temperature (SST), leading to increased stratification, causing vertical mixing limits and suppressing the upwelling process. In the Indonesian Fisheries Management Area (IFMA) 713 waters, which have enormous potential for fishery resources, five upwelling areas were identified during the southeast monsoon months (May–October) based on the Ekman pumping velocity (EPV) assessment, namely locations A (western part of West Sulawesi), B (southern Makassar), C (eastern part of Bone Bay), D (southern Banjarmasin), and E (southern Makassar Strait). Thus, this study aimed to investigate the influence of MHWs on upwelling parameter (chlorophyll-a concentration) in IFMA 713, particularly in 1998 and 2016, where prominent MHWs occurred and coincided with upwelling sessions. To accomplish this, EPV anomalies and chlorophyll-a concentrations for each MHWs event during May–October 1998 and 2016 were calculated. The analysis revealed that MHWs events co-occuring with negative (upwelling velocity is weaker than the climatological mean) and positive (upwelling velocity is stronger than the climatological average) EPV anomalies were associated with decreased chlorophyll-a concentrations.

Measuring indices of fish community structure in Fisheries Management Area 713 (FMA 713), Indonesia

Measuring indices of fish community structure in Fisheries Management Area 713 (FMA 713), Indonesia

THE ECONOMIC ANALYSIS OF FISHERIES MANAGEMENT OF BIG PELAGIC FISH IN WPPNRI 715

Fisheries management is essential in striving for fish resources to be utilized optimally and sustainably and have a welfare impact. WPPNRI 715 is one of Indonesia's eleven fisheries management areas with the most significant potential in big pelagic fish with high economic value. The aim of this study was to estimate the economic value in the management of large pelagic fisheries in WPPNRI 715. The result of the research can show utilization of big pelagic fish in WPPNRI 715 is good condition and has not exceeded the Maximum Sustainable Yield (MSY) value. Additionally, economically the benefits are still in good condition. The optimal production (MSY) of big pelagic fish in WPPNRI 715 is 421 872, 11 tons. Maximum profit MEY is Rp3 065 588,97 trillion with the actual effort of 470 609 trips where optimal effort is sustainable (MSY) of 861 131 trips and economically optimal effort (MEY) of 554 902 trips. Based on the results of the study, it was stated that there were economic benefits in the utilization of large pelagic fish resources in WPPNRI 715.

Peluang investasi dan daya dukung lingkungan usaha penangkapan ikan di Kabupaten Majene Provinsi Sulawesi Barat

Background: Majene Regency, which is located in West Sulawesi Province, is part of the Republic of Indonesia State Fisheries Management Area (WPPNRI) 713. It has a coastline length of approximately 125 km2, a sea area of more than 13,124 km2, and a land area of around 947.84 km2. The potential fish resources are 1,026,599 million tonnes per year, mainly consisting of small pelagic fish, large pelagic fish, demersal fish, coral fish, penaeid shrimp, lobsters, crabs, and squid. Methods: This research uses scientific literature sources, government publications, policy documents, academic databases including scientific journals, and books to obtain a comprehensive and up-to-date view. Findings: Data shows that capture fisheries production in Majene Regency produces 7,458 tonnes of marine fisheries products. Conclusion: This increased from the previous year's 4.36 percent from 2017 to 2018. The largest marine fisheries production came from Banggae District, contributing 21.87 percent to Majene Regency's fisheries production. Aquaculture production originating from ponds decreased by 46.36 percent from 2017 to 2018. The amount of investment entering Western Province is still relatively low, namely being ranked 30th out of 34 provinces in Indonesia and in last position. out of 5 provinces in Sulawesi.

Kinship relationship of Uroteuthis chinensis in the waters of western Kalimantan and northern Java based on morphometric characters and genetic structure

Uroteuthis chinensis was a squid species with a wide distribution and rapid reproduction. It was commonly found in the waters of western Kalimantan and northern Java, which were the highest squid fishing grounds in Indonesia. Exploitation of U. chinensis in these waters was intensive and increasing, which might have affected the sustainability of U. chinensis squid resources. Therefore, proper and responsible management was needed to maintain the sustainability of this squid resource. For exploitation to be sustainable and optimal, management based on stock units of the managed resources was required. Therefore, information was needed on the stock units of U. chinensis squid in the western waters of Kalimantan and northern Java. Currently, the Indonesian government has separated the management of these two interconnected waters. The method used was to analyze 12 morphometric characters and genetic structures with COI and Rhodopsin markers. Sampling locations included the Sungailiat and Pontianak, for the waters of western Kalimantan, Jakarta, Pekalongan, and Lamongan for the waters of northern Java. Morphometric data were analyzed using Principal Component Analysis (PCA) and Discriminant Analysis (DA) approaches. Genetic analysis (COI and Rhodopsin) included genetic diversity, AMOVA, and haplotype distribution. The results of the morphometric analysis showed that the 12 morphometric size characters in this study showed a close relationship between the five U. chinensis sample populations. Genetic variation between populations and FST values on COI and Rhodopsin showed very low values; P-values also showed results that were not significantly different between populations. The haplotype distribution of both COI and Rhodopsin showed almost the same composition in both observed waters. The results of these analyses suggested that U. chinensis species in both waters showed indications of connectivity and close kinship or could be regarded as a single stock. Therefore, collaborative management across fisheries management areas in both waters (western Kalimantan and northern Java) was required.

Impact of Implementing Ex-Foreign Ship Moratorium Policy on Tuna Fishing Business in Benoa, Bali

Regulation of the Minister of Maritime Affairs and Fisheries number 56 of 2014 and Regulation of the Minister of Maritime Affairs and Fisheries number 10 of 2015 help realize responsible fisheries management and combat Illegal, Unreported, and Unregulated (IUU) Fishing in Fisheries Management Area of ​​the Republic of Indonesia (WPP NRI). The policy of temporarily stopping permits (moratorium) for ships manufactured overseas (ex-foreign vessels) directly impacts fishermen working on ex-foreign vessels in the form of reduced income to loss of livelihoods. The research used a retrospective approach where policy analysis is carried out on the consequences of a policy after the policy is implemented. It is usually referred to as an evaluative analysis model, so it is expected to produce information that can improve the quality of the policies implemented by the government. The study aimed to determine the moratorium's impact on capture fisheries licensing on business activities, especially on fishing effort, catch per unit effort (CPUE), and socioeconomic conditions of fisheries at Benoa Harbor, Bali. This research was conducted from March to October 2022 in the Benoa Harbor Area, Bali. The data in this study were obtained from observation, interviews, questionnaires, and literature/document studies. The moratorium policy for ex-foreign vessels, followed by a ban on transshipment, significantly changed the pattern of trade, particularly for tuna, which was dominated initially by fresh tuna to frozen tuna with a lower value. The longline catches are dominated by Thunnus alalunga, followed by Thunnus maccoyii, Thunnus albacares, and Thunnus obesus. The total of ships in 2014 was 915 units, and only 246 ships remained in 2018. The significant decrease in fish landings in 2015-2017 is a real impact of the moratorium on ex-foreigners in Benoa. The results of the data analysis show that in 2014 the number of attempts was 2,264, which continued to decline until 2018, with only 697 trips.

Legal Protection of Portunus Pelagicus: An International Fisheries Law Perspective in the Republic of Indonesia's Fisheries Management Area 713

The demand for Portunus pelagicus exports is increasing, which is encouraging more Portunus pelagicus capture. As a result, portunus pelagicus resources become available. The aim of this study is to examine the legal protection of portunus pelagicus based on international fisheries law in the Fisheries Management Area of the Republic of Indonesia (WPPRI) 713 and law enforcement against illegal rajuangan capture. The research method is qualitative research using an empirical normative approach. The findings revealed that the Indonesian government has incorporated international fisheries law into national legislation governing the management of Portunus pelagicus in Indonesian fisheries management areas. Administrative sanctions are used by law enforcement to punish non-compliant Portunus pelagicus fishing. In comparison to criminal and civil sanctions, this sanction is effective because it can be directly enforced by administrative officials. The government and the community share responsibility for the protection, utilization, and preservation of portunus pelagicus so that future generations are able to enjoy it.

Biological parameters and spawning potential ratio of Longtail Tuna Thunnus tonggol landed in Kranji fishing port, Lamongan District, Indonesia

Abstract. Harlyan LI, Rahman MA, Rihmi MK, Abdillah SFA. 2023. Biological parameters and spawning potential ratio of Longtail Tuna Thunnus tonggol landed in Kranji fishing port, Lamongan District, Indonesia. Biodiversitas 24: 6527-6535. Longtail Tuna (Thunnus tonggol), one of the small-pelagic tropical fisheries in the Fisheries Management Area (FMA-712), is important in supporting global food security. Therefore, to ensure its sustainability, this fishery is applying for fishery certification to be an ecolabel fishery by the Marine Stewardship Council (MSC). However, limited information about Longtail Tuna's biological parameters and stock status in this management area will lead to failure in certification completion. This study aims to provide biological parameters and stock status of Longtail Tuna landed in the Kranji fishing port, Lamongan, Indonesia. Length, weight, and gonad weight of female Longtail Tuna individuals which landed in the Kranji fishing port were conducted from January to April 2023. Several analyses were carried out to figure out the biological parameters of Longtail Tuna, such as length-weight relationship, length at first maturity ( ) and length at first capture ( ) estimation. Length-Based Spawning Potential Ratio (LB-SPR) analysis was conducted to estimate fish exploitation. Results showed that the Longtail Tuna landing in the Kranji fishing port exhibited a negative allometric growth pattern with the length-weight relationship model W = 0.0433 FL2.7608. A comparison between (43.9+0.11cm) and (43.6+0.04cm) indicated that most female Longtail Tuna landed in the Kranji fishing port are mature (60% of the total samples). The LB-SPR analysis showed moderate exploitation status (SPR = 34%). Fishing activities are still manageable in this situation by focusing on stock sustainability. An overlapping fishing ground occurs in the Kranji water, showing the domination of two species landed in the Kranji fishing port, Longtail Tuna and Eastern Little Tuna (Euthynnus affinis). Therefore, Longtail Tuna fishery management might also consider fishery management of Eastern Little Tuna or other species with overlapped habitats.

Assessing the Institutional Domain: A Comprehensive Analysis of White Prawn (Penaeus merguiensis) Fisheries Management in Cilacap Regency through Ecosystem Approach and Multi-criteria Analysis

The concept of fisheries management in coastal and marine areas refers to the concept of sustainable development, which emphasizes the balance between economic growth, environmental quality, and the quality of natural resources. Data were collected using observation, questionnaires, and in-depth interviews with 20 respondents. This study aims to determine the condition of the management of white prawn (Penaeus merguiensis) resources from the institutional domain which has 6 indicators based on the score criteria in EAFM. This research uses a simple composite approach with flag modeling technique. The flag modeling technique is done by analyzing a multi-criteria analysis (MCA) approach in which a set of criteria is built as a basis for analyzing the state of fisheries management areas seen from the ecosystem approach in fisheries management (EAFM) through the development of composite indices. Based on the results of the research, the condition of the institutional domain in the management of white prawn in Cilacap Regency obtained a composite index value of 75.80, this fig. indicates that the condition is in the good category. Each indicator in the institutional domain obtained different valuesand conditions. For the Fisheries Management Plan indicator, it received a score of 1, which means it is in the poor category. For the indicators of the completeness of the rules of the game and the decision- making mechanism, each received a score of 2, which is a moderate category. Then, the indicator of compliance with the principles of responsible fisheries in fisheries management, the indicator of the level of synergy of fisheries management policies and institutions, and the indicator of stakeholder capacity received a score of 3, meaning that each of these indicators was in a good category. The conclusion that can be drawn is that the condition of the institutional domain in the management of white prawn in Cilacap Regency has a good category and still needs a strategy for improvement.