Potential Fishery Research Articles

Density and extractive potential of “uçá”-crab, Ucides cordatus (Linnaeus, 1763), in mangroves of the “Todos os Santos” Bay, Bahia, Brazil

Ucides cordatus is one of the main fishery resources of the “Todos os Santos” Bay (BTS), State of Bahia, Brazil. Population parameters (structure, density, and fishery potential) of this crab species were analyzed in the dry and rainy seasons in nine mangrove areas of BTS. Five sample quadrats (5 × 5 m) were used to record the number and diameter of active open burrows (with biogenic activity) and closed burrows of U. cordatus, tree variables (composition, density, and diameter), and flood level. Crab density (ind.m−2) was indirectly estimated by counting galleries. The diameter of open galleries was converted into carapace width (CW) using a regression model to later characterize the U. cordatus population structure. There were more galleries in the dry season than in the rainy season. Crab density ranged from 0.32 to 2.63 ind.m−2 (1.32 ± 0.90 ind.m−2), and the mean density was higher during the dry period (t = 0.02; p < 0.05). Crab density differed among sampling areas regardless of seasonal period. Crab size (CW) in BTS was 52.4 ± 16.7 mm, with specimens significantly larger during the dry period (t = 0.01; p < 0.05), and there was a significant difference (F = 4.57; p = 000.1) among mangrove areas. Non-commercial size animals (CW < 60.0 mm) were more abundant (65.2%) than those with commercial size (34.8%) in BTS. Crab density and flood level showed significant negative correlation (p = −0.51; p < 0.05), while there was a positive correlation between CW and flooding level (p = 0.40; p < 0.05). U. cordatus population parameters differed significantly among BTS sampling sites due to their heterogeneity. This study is the first assessment of “uçá”-crab populations in BTS mangroves and reveals a need for a sustainable management in the area. Furthermore, this study could be a model for monitoring other large brachyuran species inhabiting estuarine systems, which are economically and biologically relevant.

Perencanaan Produksi Makanan Laut dengan Pertimbangan Permintaan dan Kapasitas

The sea holds many resources that are very important for life, and one of them is the potential of fisheries, which is a basic human need. Indonesia, as a maritime country whose waters cover 2/3 of its territory, most of its people who live in coastal areas have utilized this condition by conducting fisheries management activities. However, the process still needs technical support to optimize the results. This research will review the production planning process of processed marine products under demand uncertainty. This research will construct a model to minimize production costs by considering demand uncertainty. The model will be computed using Mixed Integer Linear Program (MILP) method to provide the decision of processed products produced and the amount of production.

Biodiversity and relationship between phytoplankton and aquatic environment in the Majakerta coastal waters, Indramayu, West Java, Indonesia

Coastal area of Majakerta has a high potential fishery resource and it is commonly utilized by the surrounding community. The fluctuation on the aquatic environment around the coastal area can affect the sustainability of the phytoplankton. Sampling of this study was conducted once in each month at four stations distributed from river to the sea from December 2014 to May 2015, aiming to evaluate biodiversity and relationship between phytoplankton and the aquatic environmental condition in that coastal area. Based on the observation, phytoplankton in Majakerta coastal area consisted of six classes, i.e., Bacillariophyceae (36 genera), Cyanophyceae (7 genera), Dinophyceae (5 genera), Chlorophyceae (4 genera), Zygnemaphyceae (2 genera) and Euglenophyceae (2 genera). Based on the phytoplankton diversity index, it can be inferred that the value is relatively low. There were two habitat groups, namely group 1 (Station 1 and 2; river and estuary) and group 2 (Station 3 and 4; sea), which have influencing parameters: turbidity, pH, and salinity.

Simple pot modification improves catch efficiency and species composition in a tropical estuary mud crab (Scylla serrata) fishery

Pots are widely used fishing gear type for targeting different crustacean and fish species. Pot entrance size and design are among the most important technical parameters that influence the catch efficiency of certain species. An optimal pot entrance design should allow an efficient entry for the target species while preventing subsequent escape. The tropical estuary pot fishery targeting mud crab (Scylla serrata) in Vembanad Lake, India, employs rectangular pots with rectangular-shaped entrances. Low catch rates for target species and high bycatch rates are observed in this fishery. This study was carried out to investigate if a simple pot modification by extending the entrance of the traditional pots, can improve the catch efficiency of mud crab. Further, we estimated and compared the catch composition in this small-scale fishery using the traditional and modified entrance pots. The results showed that the catch efficiency for all sizes of mud crab is on average more than six times higher with the modified entrance pots compared to the traditional pots (622% (CI: 344–1867%)). However, significant quantities of juvenile crabs are caught in modified pots. Further, the bycatch ratio was significantly reduced for modified compared to the standard entrance pots in this fishery. These results show that such pot modifications have potential to significantly improve the catches in mud crab pot fisheries without increase in capture of bycatch species. However, additional mechanisms for excluding undersized crabs from pot catches should be investigated.

The effect of Red LED Lights on Pot Catches in Penaah Waters, Lingga Riau Island

Pot fisheries are one of the dominant activities of capture fisheries in the Penaah waters of Lingga, Riau Archipelago. This study aims to determine the effect of red LED lamp attractors on the fish catches of pots and identify the fish species. This study was conducted in the waters of Pena'ah Village, Senayang District, Lingga Regency, Riau Islands, using an experimental method. Data were collected from 18 pots for 18 days. There were three treatments, namely pot without using bait as a control, pot with red LEDs light, and pot with red LEDs light and bait, in which a total of six units of pots on each treatment. The pots caught 18 groupers during the study, of which nine individuals were captured by the pot with a red LED and bait, five individuals by the pot with a red LED pot, and four individuals without bait. The effectiveness analysis showed that the pot with red LED and bait was the highest (50%), the pot with red LED had a value of 28%, and the lowest was trapped without bait with an effectiveness value of 22%. The total catches of the pot based on the economic fish showed that adding a red LED attractor gave more types of catch than control. The red LED attractor is expected to be a solution to increase the effectiveness of the pot.

SFA를 이용한 근해어업의 온실가스 배출 효율성 및 감축잠재량 추정

The purpose of this study is to estimate greenhouse gas(GHG) emission efficiency(GEE) and GHG mitigation potential(GMP) of offshore fisheries in preparation for carbon neutral and negative promotion in the ocean and fisheries sector, and to suggest policy improvements related to GHG mitigation. To this end, this study used stochastic frontier analysis(SFA) considering exogenous determinants of GHG emission inefficiency. As a result, the GEE of fleet and drag net fisheries with high fuel cost and vessel age was lower than other fisheries. In addition, the GMP and mitigation ratio of large purse seine, large pair trawl, large otter trawl, and anchovy drag net were higher than those of other fisheries. Lastly, as policy improvements to reduce GHG emission from offshore fisheries, fleet size reduction, development of low-energy used fishing gear, easing of conditions for participation in fishing vessel modernization projects, revising laws to supply eco-friendly fishing vessel, and improvement of the tax-free petroleum supply system were proposed.

Residency and habitat use of European lobster (Homarus gammarus) within an offshore wind farm

Abstract As offshore wind energy developments increase globally in response to climate change, it is important to gain an understanding of the effects they are having on the marine environment. Whilst there is growing information on the types of organisms present within these sites, our knowledge of how species interact with these sites is limited. For the first time we examined the movements and habitat utilization of a temperate decapod, the European Lobster Homarus gammarus, using acoustic telemetry within an offshore wind farm (OWF). Innovasea V9 acoustic transmitters were externally attached to 33 individuals (carapace length = 87–113 mm) at three turbine locations within an offshore wind farm in the Irish Sea. Individuals were found to exhibit high residency to the tagging sites, with over half of tagged lobsters present at the tagging sites for 70% of the study period. Individual home ranges and core territories were calculated using 95% and 50% kernel density, respectively. Home ranges ranged from 9313.76 to 23 156.48m2 while core territories ranged from 1084.05 to 6037.38m2. Over 50% of all detections were recorded within 35 m of the scour protection. These results suggest that particular areas of habitat within fixed-turbine OWFs provide a suitable habitat for lobsters. We postulate that this is likely the result of artificial reef effects arising from the addition of artificial hard substate into previously soft sediment dominated habitats. Therefore, future fixed-turbine OWF developments across Europe may provide potential fishery opportunities as a result of artificial reef effects.

Diversity: Identification of Fish Catched Fisherman of Weru Village, Lamongan District

Lamongan Regency has great fishery potential, but the results of fishing by fishermen need to be reported to determine its diversity. The purpose of this study was to find out what fish were caught and the diversity of fish caught by fishermen from Weru Villaget. The method of conducting this research was carried out using a descriptive exploratory method with a quantitative approach, with the aim of describing the results of identifying the diversity of fish catches in Weru Village, Lamongan Regency. The results of the research from the catch of fishermen from Weru Village, Lamongan Regency, consisted of 14 fish species. Then the diversity index (H') of station I has a value of H' 0.33; station 2 has H' 0.34; station 3 has a value of H' 0.32; and station 4 has an H' value of 0.34. Then Stations 1, 2, 3, and 4 have an average value of 1.37 so they are classified as low diversity.

Carbon Emission Efficiency, Technological Progress, and Fishery Scale Expansion: Evidence from Marine Fishery in China

China’s technical progress on emissions and vast ocean area make the study for CO2 emission reduction suitable in a marine fishery. This study uses the slack variables of SBM and the Malmquist index to analyze the CO2 emission efficiency of Trawler, Seine net, Drift net, Fixed net, and Angling, along with their efficiency values, distinguishing the impact of technological progress, scale expansion, and technological efficiency. Results show that the CO2 emission efficiency of the Angling and Seine industry is high with the development potential of the low-carbon fishery. Moreover, China’s technological progress is increasing, but the technical efficiency of CO2 emission reduction is declining. Lack of pure technical efficiency is the primary constraint of low-carbon capture fishery, making changes in efficiency show a downward trend. These results expand the research depth of the efficiency impact of technological progress and reveal that technological progress keeps increasing, but the CO2 emission reduction efficiency is decreasing. This indicates that emission reduction requires both technological growth and the technology’s capacity to reduce CO2 emissions efficiently.

ANALISI ALTERNATIF PEMBANGUNAN PABRIK PEMBEKUAN UDANG VANNAAMEI (L. VANNAMEI) DI KABUPATEN KAUR PROVINSI BENGKULU

The potential of fisheries in Bengkulu Province is very large. Kaur Regency is one of the regencies in Bengkulu Province, which has a trend of vannaamei shrimp (L. vannamei) production in Kaur Regency which always increases every year. Production of vannamei shrimp (L. vannamei) in 2019 reached 950 tons in 2021, it reached 4,524 tons. This study aims to determine what alternatives can be done for planning the construction of a vannamei shrimp (L. vannamei) freezing plant. This study uses the SWOT analysis method. The results showed that the strategy needed was aggressive. Alternative strategies are; to improve the quality of materials and equipment for cultivation processes; recruit competent workforce in the field of marketing for the expansion of the domestic market; improve the quality of human resources in facing the international market; the vast market share of shrimp provides an opportunity for Kaur Regency to develop a frozen shrimp processing industry which is also strongly supported by the government; build cold storage to accommodate the production of vannamei shrimp (L. vannamei); the government or related stakeholders can immediately build facilities such as an ice factory and add electricity to support the continuity of the shrimp industry in Kaur Regency; increase capital by borrowing from banks or partners to increase production or expand shrimp marketing; and build relationships between the government, stakeholders related to shrimp farmers to collect production results.Keywords: SWOT analysis; Alternative Processing Unit Development Planning

Description of fish cultivation and production results of fish farming group in Palembang City

Indonesia has enormous fishery potential. The city of Palembang is one area where the government encourages the development of urban fishery businesses through the establishment of fishery groups. Until now, the topic of urban fisheries on cultivation methods and production results and farmers' income has not been studied much. The research aims to · Describe the cultivation process in aquaculture groups in the Palembang City. · Analyzing the production results of fish farming groups in Palembang City · Analyzing the income of fish cultivating groups in Palembang City. The results of this research are useful as a foundation for developing urban fisheries. This research was conducted in Gandus and Sukarami Districts, Palembang City. This study used a survey method with an unbalanced layered random sampling method. The number of samples is 100 people. The method of analysis using the scoring method, Spearman correlation statistical testing. This shows that in the future it is necessary to continue to increase the participation of fish cultivators in groups, improve group work programs to provide increased production capacity and fish cultivating businesses, increase the role of fishery extension workers, establish collaborative programs with stakeholders for fishery development in Palembang City.

Productivity Analysis of Fish Farming in Floating Net Cages in Lake Toba (Case Study in Pangururan Subdistrict, Samosir District, Indonesia)

Lake Toba has fishery potential that needs to be managed properly, one of which is the use of Lake Toba for fish farming with floating net cage systems. This study aims to analyze the productivity of carp and tilapia aquaculture on the floating net cages system in Lake Toba, Pangururan District, Samosir Regency, North Sumatra Province and what factors affect productivity, This research was conducted from June 2022 to January 2023 in Pangururan District, Samosir Regency, North Sumatra Province using the case study method. Respondents in this study were 60 carp and tilapia farmers. The data collected were primary data and secondary data. Data were analyzed using productivity analysis with Microsoft Office Excel 2010, while multiple linear regression analysis was analyzed using the 2019 minitab program. The results of the analysis show that the average value of carp productivity is 22.32 kg/m3/season, this value is higher than the value of tilapia productivity which has a value of 17.2 kg/m3. The results of multiple linear regression statistical tests obtained factors that affect the productivity of floating net cages carp farming on Lake Toba, Pangururan District, Samosir Regency, North Sumatra Province are feed and pond volume, while the factors that affect the productivity of floating net cages tilapia farming on Lake Toba, Pangururan District, Samosir Regency, North Sumatra Province are seeds, feed, pond volume, and age of cultivators.

Fish Stock Status Assessment in Alue Naga Waters Using A 200 Khz Single Beam Echosounder

Monitoring fish stocks is an important part of sustainable management of fisheries resources. Conducting the current evaluation is very difficult since there are no reliable data on the potential for fisheries in the waters surrounding Banda Aceh city. The hydroacoustic method was used for the first time in the waters of Alue Naga, located north of Banda Aceh, to evaluate the condition of fish stocks. A single beam scientific echosounder with a frequency of 200 kHz was used to collect hydroacoustic data in the area. The collected data was then processed using the Sonar5-Pro software. Cell integration was carried out at an interval of 10 meters vertically with an elementary sampling distance (ESD) of 200 m. While the volume backscattering strength (SV) value tends to be the highest in intermediate layers, the target strength (TS) value was found to be maximum in deeper layer, reaching a maximum value of -49.46 dB at a depth of 51–60 m. Area density value (#.ha-1) was found to be the highest at a depth of 11-20 m, while Biomass (g.ha-1) at a depth of 21-30 m was the highest among other depth layers with a value of 1558 g.ha-1. According to the in-situ catches of Carangoides, Selaroides, Aphareus, Variola, and Priacanthidae, there are a number of potential reef fish resources in the waters of Alue Naga. The findings of this study strongly support the conclusion that the hydroacoustic method effectively provides comprehensive information on the horizontal and vertical distribution of fish in Alue Naga waters.

Fatty Acid Positions in Triacylglycerol of Iridescent Shark Fish Oil (Pangasius sp.), Focusing on Omega-3 and Omega-6 Fatty Acids.

&lt;b&gt;Background and Objective:&lt;/b&gt; Considering the many health benefits of fish oil, the potential of Indonesian fisheries needs to be mapped to find local fish oil sources that have the opportunity to be used as a source of omega-3 and 6. This research aimed to ascertain the glyceride profile of iridescent shark fish oil hydrolyzed by immobilized lipase from &lt;i&gt;Thermomyces lanuginosus&lt;/i&gt; at the sn-1,3 position and identify the position of omega-3 and omega-6 fatty acids. &lt;b&gt;Materials and Methods:&lt;/b&gt; To extract the fish oil from the iridescent shark, the soxhletation method was utilized. The analysis of the fatty acid composition that was carried out using gas chromatography (GC) was previously esterified with BF&lt;sub&gt;3&lt;/sub&gt; before it was carried out to position the fatty acid hydrolysis that was carried out using lipase enzymes to position the fatty acid composition. &lt;b&gt;Results:&lt;/b&gt; The sample had more unsaturated fatty acids than saturated ones. Omega-3 and omega-6 fatty acids are more concentrated in the fat molecule's sn-2 position than in the sn-1+sn-3 location. Iridescent shark fish oil meets the recommended ratio of omega-3 to omega-6 (1:1) or better (2:1). &lt;b&gt;Conclusion:&lt;/b&gt; It has been discovered that iridescent shark fish oil is rich in omega-3 and omega-6 fatty acids, especially those in the sn-2 position. This makes it a great food choice for those trying to get more omega-3 unsaturated fatty acids into their diets.

Pengembangan Pemasaran Abon Ikan Bandeng Laut Produksi Usaha Mikro “Dpore Meme” Desa Alasmalang, Kecamatan Panarukan, Kabupaten Situbondo

The strategic marine and fisheries potential of Situbondo Regency includes a high (106.28 tonnes per year) potential for catching sea milkfish (Chanos chanos). The neighborhood makes very little attempts to use processed sea milkfish, nevertheless. Fishermen on the Situbondo coast catch sea milkfish (Chanos chanos), which is only sold fresh and has a poor selling price. Using this chance, Dpore Meme Micro Business turns fresh marine milkfish into shredded fish with a great nutritious value. Because it has a unique flavor, a softer texture, is more fragrant and delectable, and is packed with nutrients, marine milk floss has a potential commercial opportunity and is highly alluring to the general population. There is a need for marketing development, which includes developing online marketing, expanding the marketing area, increasing collaboration with marketing networks or resellers in areas outside the city of Situbondo, as well as optimizing promotions to support product marketing. The current challenge is that the marketing and promotion carried out by the Dpore Meme Micro Enterprise is still offline and on a local scale in the Situbondo Regency area.

Overtaking Marine Pollution Issues for Sustainable Eco-Tourism in Mapur Island

Kepulauan Riau, which is located in the border area, is endowed with a lot of potential of fisheries and maritime resources. It has high potential on leveraging blue economy of Indonesia. The waters of the Kepulauan Riau presenting the beauty of the sea from the coast to its underwater natural charm such as coral reef ecosystems and marine biota, provide important prospects for the Kepulauan Riau to be able to increase the blue economy through sustainable tourism. For this reason, this study aims to find out what programs have been carried out by the government and civil society in order to realize sustainable tourism in the Kepulauan Riau. This research uses descriptive qualitative research method. The key findings of this research shows that even though Kepulauan Riau is one of the primary target of traditional and non-traditional strategic market of ASEAN, however, the enforcement of sustainable tourism remain deal with several obstacles and challenges that come up with uncompleted goals of the blue economy.

Analisis Strategi Pemasaran Dalam Menghadapi Persaingan Usaha Terhadap Usaha Ikan Laut

The existence of potential fishery resources in Indonesia makes business opportunities very abundant and profitable. This is a result of the large number of people consuming marine fish and the increasing demand for marine fish in the market resulting in intense competition in the business. The purpose of this research is to identify the implementation of the marketing strategy of marine fish agents in the Bandar Jaya Timur market, to find out the competitive conditions of marine fish agents and to find out how marine fish agents in the East Bandar Jaya Market face business competition. The type of research used is a qualitative research method with a descriptive design. The results of the research prove that the result of strength with opportunity and SO (Strength Opportunities) strategy, so that it is found that the aspect that must be prioritized is the quality of the product by looking at the increasing purchasing power of the people. The next result is that weaknesses and opportunities or WO (Weakness-Opportunity) strategies are found to take advantage of opportunities for increasing public purchasing power and increasing the number of human resources, as well as optimizing the schedule for fishing. Internal and external analysis of the industry and Cartesian diagrams can be found that the main strategy of the marine fish business is the Growth strategy. The marine fish business can maintain and improve the quality of marine fish products so that people continue to believe in the products of the marine fish business and establish networks with suppliers and consumers as well as expand marketing and take advantage of technological developments to face business competition.

Identifikasi dan Komposisi Hasil Tangkapan Ikan dengan Alat Tangkap Mini Purse Seine di Pesisir Kubutambahan, Bali

Kubutambahan Village is one of the villages in Kubutambahan Subdistrict, Buleleng Regency with the main catch fishery potential of Mackerel scad and several other species of fish. The fishing gear used by fishermen is dominated by mini purse seine. The purpose of this research was to determine the types of fish caught and the composition of fish catches. This research was conducted from September 2021 until October 2021. The data were obtained by direct observation in the field. Fish samples were taken using simple random sampling. The results showed that there were 20 species of fish, grouped into 5 orders, 9 families and 16 genera. The composition of the catches of fishermen using mini purse seine is dominated by Mackerel scad at 48.4% and the lowest is Hound Needlefish at 0.001% of overall catch.

Exploitation status and spawning potential ratio of banana prawn (Penaeus merguiensis) after trawling ban in Kaimana, West Papua

Penaeus merguiensis de Man, 1888 is a prawn species with high commercial value and is a potential fisheries resource in Kaimana, West Papua, Indonesia. Formerly exploited by foreign fishing trawlers, the Indonesian government issued a national moratorium of foreign fishing ship licensing and trawling ban in 2014 and 2015, respectively. Consequently, the fishing activities in this area have shifted to local, small-scale vessels using trammel nets. This study aimed to determine the exploitation status and the spawning potential ratio (SPR) of P. merguiensis in Kaimana waters after the moratorium implementation, considering this species’ previous intensive fishing pressure. The study was conducted from April 2018 to December 2020 using 15,227 measurement samples. The optimal fishing season was observed from July to September, while the peak spawning season was detected between August and November. The carapace length (CLc) was significantly increased, suggesting the improvement of the banana prawn population over three years of trawling ban implementation. However, the exploitation rate (E) from 2018 to 2020 was 0.7%, and the SPR was 17%, implying that the prawn stock was still in an overfished condition. Therefore, fisheries management needs to regulate the efforts of trammel net fishers to avoid further fishing pressure in Kaimana waters.

Increasing sustainability in food production by using alternative bait in snow crab (Chionoecetes opilio) fishery in the barents sea

The use of food grade wild-captured species as bait for other fisheries questions the sustainability of food production. In pot fisheries, bait is an important factor determining the effectiveness of the gear. In snow crab (Chionoecetes opilio) fishery, the pots are normally baited with squid (Illex sp.) and herring (Clupea harengus). This fishery uses substantial amounts of bait for each pot deployment, and it constitutes one of the largest expenses for operating the pots along with costs for fuel. Furthermore, reliance on bait that originates from wild-capture fisheries questions economic and environmental sustainability, and involves additional use of fuel for capture and transportation of the bait which increases the carbon footprint of the industry. Therefore, the use of alternative bait sources is needed. One such alternative bait source can be originating from processed by-products from commercial fisheries. However, for the new bait to be acceptable for the fishery, it must provide comparable catch efficiency as the traditional bait. Therefore, this study aimed at comparing the performance of a new experimental bait against the traditionally used squid bait in the Barents Sea snow crab fishery. The results showed no statistically significant difference in catch efficiency of target-sized snow crab. Specifically, a formal uncertainty estimation based on nested bootstrapping showed that there was no significant difference in efficiency between bait types for target-sized individuals for soak times typically employed in the fishery. Thereby this shows a potential to increase sustainability in food production and a positive effect on the size selectivity by additionally demonstrating a reduced capture of undersized individuals.