Catch Composition Research Articles

Status of mackerel scad (Decapterus sp.) resource based on Ecosystem Approach (EA) at PPS Kutaraja, Banda Aceh

The Kutaraja Ocean Fishery Port (PPS) is the largest port serving as the center of fisheries in Aceh Province, with a potential and diverse fishery, including the mackerel scad (Decapterus sp.). The fluctuation of the mackerel scad population on an annual basis, which raises concerns about the sustainability of the stock. Therefore, a structured management effort is required, employing an Ecosystem Approach to Fisheries Management (EAFM) to address this problem. The study aimed to assess the management status of mackerel scad resources based on PPS Kutaraja. The research was carried out from February to April 2023. Data collection was carried out through direct observation and interviews with 73 respondents. Data analysis for each indicator was performed using a multi-criteria approach with composite index assessment and flag model visualization. The research results indicate a 20% annual decline in the CPUE trend, a relatively consistent fish size trend, a 4% proportion of juvenile fish caught, a catch composition dominated by target species at 77%. Based on these EAFM indicators, the management status of mackerel scad resources in PPS Kutaraja falls under the 'good' category.

Freedivers harvest thousands of sea turtles a year in the Solomon Islands

Abstract Sea turtles are harvested in many small‐scale fisheries (SSFs), but few nations have quantified the impacts that SSFs are having on their sea turtle stocks. This study provides the first assessment on the catch composition, national harvest rates, and long‐term trends in sea turtle catches in the Solomon Islands SSFs. Between October 2016 and May 2018, 10 community monitors located in eight of the nine provinces of the Solomon Islands were trained and employed to work alongside fishers in their respective communities to document, photograph, and georeference the reefs where sea turtles were harvested. Local ecological knowledge (LEK) surveys were then conducted with 32 experienced fishers to infer whether the harvest rates of sea turtles had changed in recent decades. Community monitors recorded information on 1,132 sea turtles that were harvested on 529 fishing trips: 1,119 sea turtles were identified to species level, with harvests consisting of 73.3% (n = 818) green sea turtles (Chelonia mydas), 25.7% hawksbill sea turtles (n = 291) (Eretmochelys imbricata), and 0.9% (n = 10) olive ridley sea turtles (Lepidochelys olivacea). The great majority (92.6%) of sea turtles were captured by night‐time and daytime freedivers who use masks, snorkels, fins, hooks, spears, and underwater flashlights to target a wide range of fauna that inhabit coral reefs. A methodology that accounts for spatial heterogeneity in sea turtle catch rates was used to estimate that the SSFs of the Solomon Islands harvested 11,184 sea turtles per year, with a 95% confidence interval of 5,862–23,717 sea turtles. Experienced freedivers reported a 4.9‐fold decline in sea turtle harvest rates over the past 30 years, indicating that the sea turtle stocks of the Solomon Islands are being overfished. The results and recommendations from this study were integrated into the Solomon Islands National Plan of Action for Marine Turtles 2023–2027.

Catch assemblages in the small-scale trap fishery with relation to hydrographic features of a tropical bay in the Gulf of Thailand.

Catches from the small-scale trap fishery in Bandon Bay, Suratthani, Thailand, were monitored from 14 sites around the Bay, then disturbance to aquatic communities and catch assemblage were examined. At the same time, the hydrographical features of the bay were surveyed. The study was conducted throughout 2019 except in December, when a tropical cyclone made sampling impossible. In total, 17,373 animals from 118 species or species groups of aquatic animals were collected. The main target of the fishery, blue swimming crab Portunus pelagicus, contributed about 10% of the total catch in terms of number; meanwhile, another crab, Charybdis affinis, was the most dominant species (41% of total). W-statistics of Abundance-Biomass Comparison curves ranged between -0.025 and 0.031, indicating light disturbance to the communities in this fishing ground. The catch assemblage, based on number in catch composition, were divided into three main clusters and six sub-clusters by using the self-organizing map (SOM) technique. The SOM results showed that the catch assemblages differed based largely on temporal variation. The hydrographic features of Bandon Bay at times exhibited a layered structure and had strong spatial variation. The bay's current system was governed by motion of tidal currents; meanwhile, the circulation was governed by monsoonal wind and freshwater discharges. Tidal current was strong and ranged between approximately 0.6 m to 2.2 m. Water within the bay was always warmer than the outer sea. High water temperature was observed two times during the year: during monsoon transition 1 (April to May) and transition 2 (October). Salinity showed great spatial and temporal variation, differing by more than 5-10 ppt horizontally. It was possible to use these dynamic hydrological features of Bandon Bay to explain assemblage patterns of the trap-net catches.

River discharge, fishing effort and catch composition of prawn fisheries in coastal Tanzania

This study examined the relationships between river discharge, fishing effort and catch composition of prawn fisheries in coastal Tanzania. Key assumptions were that river discharge would be a good indicator of rainfall and that the number of fishing vessels would reflect fishing intensity. We investigated whether reduced river discharge or increased fishing effort caused the collapse of the industrial prawn fishery in 2007, and which of these factors delayed recovery prior to reopening the fishery in 2017. The analysis showed a positive relationship between Catch Per Unit Effort (CPUE) and river discharge, with decreased river flow resulting in reduced prawn catches. The number of fishing vessels had little impact on CPUE before 2003, but thereafter CPUE declined even when fishing effort was reduced by 50%. A shift in trawl catches from a prawn-dominated fishery to a fish-dominated fishery was observed four years before the collapse. The trend in river discharge persisted below average (22 m³/s) between 2000 and 2007. Forewarning of low river discharge, changing trawl catch composition, and increasing effort may have led to developing proactive strategies to minimise the impact of a changing regime on fish stocks and dependent communities. We recommend establishing a monitoring system to anticipate similar events in the future.

Untangling the Complexity of Small-Scale Fisheries: Building an Understanding of Grouper-Snapper Fisheries Dynamics in Saleh Bay, West Nusa Tenggara, Indonesia

Small-scale tropical fisheries are complex systems that utilize multiple fishing gears to target various species. In this study, we investigated small-scale reef and demersal fisheries in Saleh Bay, Indonesia, using catch and effort data from 2016 to 2019, where 57.7 percent of the catch was grouper (serranids) and snapper (lutjanids). Despite the complexity (75 documented species and eight fishing methods), this fishery is characterized by the catches of four dominant species: leopard coral grouper (Plectropomus leopardus), orange-spotted-grouper (Epinephelus coioides), spotted coral grouper (P. maculatus), and malabar blood snapper (Lutjanus malabaricus). The species caught varied among fishing methods. Over 90% of the catch was attributed to three primary fishing methods: bottom longline, speargun, and handline. Multivariate analyses found that fishing depth, season, and/or year significantly influenced the catch composition for each of these fishing methods. Fishing activities exhibit a temporal pattern influenced by monsoonal seasons. Results also suggest that fishers employ specialized fishing tactics by targeting high-value species to maximize their profits. This study recommends a management strategy of focusing on monitoring and managing the three main fishing gears and four important species during their peak seasons to reduce some of the complexity and management costs.

Assessing the Fishing Impact on the Marine Ecosystem of Guishan Island in the Northeastern Waters of Taiwan Using Ecopath and Ecosim

The northeastern waters of Guishan Island constitute one of the crucial fishing grounds for coastal trawl fishery in Taiwan and have been exploited for many decades. To construct the marine ecosystem and to examine the interactions among trophic levels of fisheries resources in the waters of Guishan Island, historical catch, catch composition, biological information, fishing effort, environmental data such as sea surface temperature, salinity, and nutrients were analyzed using Ecopath with Ecosim. The results indicated that the longline and drift net fisheries have a very minor incidental catch of cetaceans, with a fishing mortality (F) of 0.01 year−1 and an exploitation rate (E) of 0.03. The F and E were 0.308 year−1 and 0.617 for small skates and rays, and were 0.261 year−1 and 0.580, respectively, for small sharks. The F and E of the dolphinfish, Coryphaena hippurus, an important pelagic species, were 0.411 year−1 and 0.245, respectively. Fisheries had negative impact on major commercial species except the dolphinfish and the oil fish, Lepidocybium spp., which benefited from the reduction of their predators or competitors. The keystone species of the Guishan Island marine ecosystem is phytoplankton, which has the lowest trophic level and great biomass, and is an important energy source of the ecosystem. The influences of zooplankton and anchovy rank as second and third, respectively, with regard to the keystone species in the ecosystem due to their great biomass. Regarding the biomass of less abundant species, carangids had the highest influence followed by hairtail due to their feeding habits. The results of simulations using Ecosim indicated that the hairtail, small sharks, skates and rays, mackerels, and marine eels will benefit if fishing efforts are reduced by 30%. On the other hand, the biomass of phytoplankton, zooplankton, demersal benthivores, and shrimps will decrease due to the increase in the biomass of their predators.

ABUNDANCE AND SPECIES COMPOSITION OF THE FISHES IN BLUE NILE RIVER BELOW THE TISS ISSAT FALL, ETHIOPIA

In the present study we evaluate the relative abundance and species composition of fishes in Blue Nile River below the fall during the wet season (September-October 2010) and dry season (March-April 2011). Fish samples were collected by using monofilaments gillnets (5-55 mm) and multifilament gillnets, having mesh sizes of six, eight, ten, twelve and fourteen centimeter stretched bar mesh, having a length of twenty five meter and depth of one and half meter, on three sampling sites of the Blue Nile River below Tisisat Fall. Eight hundred fifty seven fish specimens that belong to a single class, Actinopeterygii (ray-finned fishes), four orders, and five families and 6 genera were collected. The most dominant species were Labeobarbus intermedius, Labeo forskalii and Mormyrus kannume. The site harbors large flock of L. intermedius population. Sefiana site had the higher diversity (average H'=3.02). Labeobarbus intermedius was the most dominant (39.67% by number) followed by Labeo forskalii (27.77%) and M. kannume (11.67%). The other species, L. nedgia, B. docmak, L. crassibarbis, C. gariepinus and O. niloticus were found in 9.57%, 5.13%, 3.50%, 1.98% and 0.70%, respectively. All fish species except C. gariepinus and O. niloticus were found in all sites. All the fish species except L. crassibarbis, B. docmak and C. gariepinus showed significant differences in abundance between seasons with overall catch composition of 39.67%, 27.77%, 9.57%, and 11.67% for L. intermedius, L .forskalii, L. nedgia and M. kannume, respectively. L. intermedius, L. forskalii, L. nedgia and M. kannume were the most important species in both seasons and in most of the sampling sites. The studied habitats are in danger being eroded and therefore catchment rehabilitation should be considered and the massive seasonal fishing by the local communities should be reduced

Assessment of amateur fishing and its impact on the state of stocks of aquatic biological resources on the Ob river and its tributaries (Chulym, Tom) within the boundaries of the Tomsk region

Amateur fishing is one of the types of activities for the extraction (catch) of aquatic biological resources, which affects their stocks. As part of the state task, VNIRO conducts annual monitoring of amateur fishing and analyzes its impact on the state of aquatic life stocks. The paper presents the seasonal results of observations for the period from September 2022 to August 2023, including: the number of days suitable for amateur fishing, the number of amateur fishermen, the species composition of catches and an estimate of the volume of their catch. An assessment of the impact of amateur fishing on the stocks of aquatic biological resources is presented. The largest quantitative catch falls on pike (18.2%), perch (17.9%), roach (11.3%), ide (11.1%), and also, mainly on the Tom — Yelets river (16.1%), and in the mass unit of measurement — on pike, accounting for 50.7% of the total catch weight in year. The largest number of amateur fishermen and the volume of fish caught by them falls on the summer and autumn periods. In the autumn period, pike is caught better than at other times of the year, and more experienced amateur anglers come to such fishing. The seasons of the year are also significantly different in terms of the average number of amateur fishermen per day and the duration of fishing, there are the least number of winter fishing enthusiasts, which is due to weather conditions and meager catches. In spring, the average number of amateur fishermen per day increases by 2.5 times, and in summer it is already 6.5 times more than in winter. The average duration of fishing also increases from the winter period (2 hours) to the summer (6 hours). In general, the impact of amateur fishing on aquatic biological resources is assessed as weak, but there is pressure on certain species that are in the greatest consumer demand.

Evidence of Considerable Shifts in Catch Composition in the Artisanal Spiny Lobster Fishery in Kenya.

The artisanal lobster fishery in Kenya is small in world terms but important locally both in terms of supporting local fishing communities and generating revenue for the government. Despite its socioeconomic importance, detailed knowledge of many aspects of the fishery is lacking. The study reported herein aimed to investigate and provide information on the population structure and catch composition of spiny lobsters caught by artisanal fishers off six major landing sites along the coastline. A total of 2711 lobsters representing five palinurid species were collected during the study period (November 2000-March 2001). Among the five species, Panulirus longipes dominated the catches in Msambweni (75%) and Shimoni (58%), P. homarus in Mambrui (70%) and Kipini (72%), P. ornatus in Lamu (49%), and P. penicillatus in Kilifi (39%). P. versicolor was the rarest species observed in the catches across the six sites. The overall catch consisted of 33% P. ornatus, 32% P. homarus, 28% P. longipes, 6% P. penicillatus and 2% P. versicolor. Sitewise, Lamu contributed 31% of the overall catch, Kipini 23%, Shimoni 20%, Mambrui 13%, Msambweni 7%, and Kilifi 6%. A comparison of the results of this study and lobster abundance data from 1970s surveys revealed considerable shifts in the catch composition of artisanal landings over time. Future work on this fishery should concentrate on the lobster populations in the decades-old marine protected areas to obtain unfished reference data to assess the fishery and establish the underlying cause(s) of the observed shifts in catch composition.

Connecting catch profiles with efficiency: An application to the beam trawl fishery in the Northern Adriatic Sea

Estimation of technical efficiency in fisheries is most commonly finalized at comparing the conversion from inputs (e.g. time at sea, fuel consumption) to production (i.e. landed fish) among vessels or gears. In this paper we adopt a novel approach focusing on the efficiency of fishing trips characterized by different catch composition within the same fleet. In particular, the case study under analysis is represented by the beam trawl (“rapido”) fishery of Chioggia (Adriatic Sea, GSA 17), which has been subject to increasing technical and effort limitations in recent years due to its severe impacts on the marine ecosystem. The methodological strategy first involves a cluster analysis of catch profiles to identify homogeneous groups of fishing trips, which are subsequently compared in terms of economic performance based on the efficiency scores from stochastic frontier analysis. By including also an estimation of Greenhouse Gas emissions per trip, the results from our study can be used to inform future management interventions that aim at improving the overall efficiency of the fishery while reducing its carbon footprint and the pressure on the most relevant target species.

Composition of Catch Results from Gombang Fishing Tools in Prapat Tunggal Village, Bengkalis District, Riau Province

One of the livelihoods of the people of Prapat Tunggal Village, Bengkalis Regency, Riau Province, is fishing. The fishing gear fishermen operate is longline, gombang, drier, and gill nets. The research was conducted in June to determine the composition of catches from gombang fishing gear in Prapat Tunggal Village. The method used is a survey method and descriptive analysis. From the results of this research, the number of catches from gombang fishing equipment was 153.77 kg or 433,290 fish. The dominant net is rebon shrimp, which is the main catch of 77.90% of the total weight of the trap and the bycatch catch of 20.92%, as well as the discard catch of 1.17%.

Bio-socio-economic analysis of ESBN fishery of Kattoli coastal area of Chattogram, Bangladesh

In consideration of the characteristics inherent to the estuarine ecosystem, the employment of the estuarine set bag net (ESBN) emerges as an effective instrument for the capture of a diverse spectrum of finfish and shellfish species. The present investigation, conducted between May and December 2015 in Kattoli, a representative locality along the Chattogram coast, was undertaken to perform a comprehensive bio-socio-economic analysis of the ESBN fishery. The analysis of the catch composition in Kattoli revealed that finfish constituted 67.67%, shrimp accounted for 24.34%, and crab made up 7.99% of the total catch. The average daily catch per boat in Kattoli was determined to be 25.8 kg. The zenith of the total daily catch per boat, reaching 70 kg, was observed in December, while the nadir occurred in August, when no fishing activities were recorded in Kattoli. The cumulative catch over the study period in Kattoli amounted to 26,664 kg, with a complete absence of fishing in August. Moreover, the average daily catch per fisherman stood at 6.19 kg in Kattoli. In terms of economic considerations, the mean monthly cost per boat in the Kattoli region was approximately 8,750 BDT, while the average monthly sales revenue exceeded 28,695 BDT in Kattoli. Notably, during July and August, a substantial proportion of fishermen were engaged in Hilsa (Tenualosa ilisha) fishing utilizing gill nets, which resulted in a diminished catch with ESBN during these months. Furthermore, the preliminary socio-economic conditions of the study area were also explored. This research offers valuable insights into the bio-socio-economic dimensions of the ESBN fishery in the Kattoli coastal area, with potential practical implications for fisheries management and the livelihoods of the local fishing community. Asian J. Med. Biol. Res. 2023, 9 (4), 114-125

Composition of Tuna Catch Hand Line at the Fish Landing Base (FLB) Lonrae, Bone Regency, South Sulawesi Province, Indonesia

Fish landed at fishing ports generally come from various species, fisheries management has developed into a decentralized system. Tuna is one type of economically important fish in the world and is the third largest fishery commodity in Indonesia. The aim of this research is to determine the size composition of catches and analyze the relationship between length and weight of hand line tuna catches. Data collection techniques were carried out by observing and measuring as well as interviews with crew members of hand-line fishing boats who landed their catches at the Lonrae Fish Landing Base (FLB). Descriptive data is presented in the form of tables and graphs. The statistical analysis used is a simple regression between two variables, namely the length and weight of the fish. Next, to get the regression coefficients, the data is processed using the graphical method provided in MS Excel software. The catch of hand line tuna boats landed at FLB Lonrae, consists of three species of tuna, namely: yellowfin tuna (Thunnus albacares), skipjack tuna (Katsuwonus pelamis) and bigeye tuna (Thunnus obesus). The length-weight relationship of 876 Yellowfin tuna fish obtained a value of b=3.08, the length-weight relationship of 467 Skipjack Tuna fish obtained a b value of 2.71 and the length-weight relationship of 430 Bigeye tuna fish obtained a value of b=2.97 shows positive allometric growth where weight growth is faster than length growth. The tuna species composition observed at PPI Lonrae Bone Regency consisted of 3 species, namely Yellowfin Tuna, Bigeye Tuna and Skipjack. Composition of tuna species YFT=29.2% BET=11.8% and SKJ =58.97%.

An Assessment of Coastal and Bank fisheries in Mauritius: Analysis of CPFD Trends

Marine capture fisheries are crucial for food security and economic stability, yet they confront escalating threats from anthropogenic activities and climate change. This study focuses on the coastal and bank fisheries of the Republic of Mauritius, a Small Island Developing State (SIDS) which is highly reliant on fisheries. We analyze a decade of catch data sourced from the Ministry of Blue Economy, Marine Resources, Fisheries, and Shipping, by studying catch composition and trends in Catch Per Fisherman Day (CPFD). Our analysis reveals intriguing patterns in CPFD across different regions. Coastal fisheries exhibit fluctuations in CPFD for various fishing methods, signaling the necessity for adaptive management strategies. In contrast, bank fisheries demonstrate more stable CPFD trends, possibly due to the unique characteristics of these fishing grounds. These findings offer valuable insights for fisheries management and conservation efforts in Mauritius. They emphasize the significance of sustainable practices and adaptive management to safeguard the future of these vital marine resources amidst environmental challenges.

Yellowstripe scad fishery (Selaroides leptolepis) in FMA 712: a short review

Small pelagic fish caught with mini purse seines (MPS) in the Java Sea has been exploited for a long time and causes resource sustainability. Policies in preserving natural resources require scientific studies that can provide management options. This research was conducted from March to July 2017 at PPN Pekalongan by recording catches and measuring fork length (FL). The composition of the MPS catch showed that 64% were small pelagic and dominated by Goldstripe sardinella (Sardinella gibbosa) 56.3%, Bigeye scad (Selar crumenophthalmus) 19.3%, and the scads (Decapterus spp) 12.3%, other species with small numbers including Yellowstripe scad (Selaroides leptolepis) by 2.5%. This Yellowstripe scad has a length of between 4.5-18.5 cm FL (average of 10.86 cm FL). The estimated natural mortality (M) is less than the fishing mortality (F). The level of exploitation (E=0.70) indicates that it is overfishing. The management operations that need to be taken to preserve the yellowstripe scad are by regulating the fishing area, determining the size of the allowed MPS nets, and limiting MPS attempts in the Java Sea.

Small-scale fishery catch composition in Rhodes (Eastern Mediterranean Sea)

Trammel net and boat-seine experimental fishing samplings were carried out seasonally, over a rocky-sandy and a Posidonia oceanica habitat respectively, in the coastal waters of Rhodes, south-eastern Aegean Sea, Greece, between 2019 and 2020. Fish catch composition, abundance and biomass were investigated as a contribution to the qualitative and quantitative monitoring of the fish assemblages in the artisanal fishery in this Greek marine region most affected by biological invasion. A total of 56 native and 11 alien fish species were captured. Five invasive species Fistularia commersonii, Pterois miles, Siganus rivulatus, Siganus luridus and Lagocephalus sceleratus were recorded using both fishing gear. In trammel nets, the alien to native fish species ratio was 1:2.87 with eight allochthonous species composing 43% of the total abundance and greatly exceeding native species biomass with the most dominant being F. commersonii, P. miles, S. rivulatus and S. luridus. Boat seine samples were dominated by Spicara smaris and Boops boops, which accounted for 84% and 56% of total abundance and biomass, respectively, while the alien to native fish species ratio was 1:5.1. The 10 Lessepsian fish, i.e., fish that have entered the Mediterranean Sea via the Suez Canal, identified on a Posidonia seabed represented a small proportion of the total abundance (3.4%), while their biomass reached 17% of the total catch, with a prevalence of F. commersonii. Among alien fish on P. oceanica, S. rivulatus exhibited the greatest abundance, followed by F. commersonii, Parupeneus forsskali and S. luridus, with small but not negligible densities of Pteragogus trispilus and Torquigener flavimaculosus. The abundance of Pterois miles over the rocky-sandy habitat was remarkable. Results indicate a transitional shift in fish catch composition with introduced species competing with natives for food and space (i.e. between introduced siganids and Sparisoma cretense, Sarpa salpa, between the recently introduced P. forsskali and mullids, and between introduced P. miles and scorpaenids), further influenced synergistically by environmental and anthropogenic factors. The Total-Standard length and Total weight-Total length relationships and their applications in fisheries data for the allochthonous fish are briefly discussed.

Mean temperature of the catch index can be masked by changes in catch composition unrelated to ocean warming

AbstractOceans are increasingly warming through climate change. Fish and invertebrate ectotherms respond to ocean warming through poleward and depth‐related migrations, a consequence of which is disruption of fisheries catch compositions. Mean temperature of the catch (MTC) is an index of change in catch composition, from colder to warmer water species. MTC is widely applied as an easily parameterised variable using readily available data (catch and species preferred temperature), but few studies underscore situations that might mask the “true” MTC trend. Here, we use fisheries catch in the Arabian‐Persian Gulf (“Gulf”) to highlight, for the first time, how abrupt changes in market demand can strongly influence catch composition and thereby mask a trend in MTC, and discuss the implications of the unmasked MTC trend to fisheries in the region. We found that a recent sharp decline in MTC from 27 to 26°C, despite a gradual increase in sea surface temperature, coincided with an escalated demand for the largehead hairtail (Trichiurus lepturus), a relatively cold‐water species in the Gulf, that caused catch to dramatically increase for export to overseas markets. Our findings suggest that the change in MTC reflected a fishery response to satisfy increased international market demand, rather than reflecting warming‐driven changes in catch composition. When excluding the effect of T. lepturus catch, the Gulf MTC trend was stable over time and consistent with a trend in many tropical and subtropical waters. Our findings highlight that an MTC change can be masked by factors unrelated to warming‐driven changes in catch composition, and that catch‐only MTC trends should be examined cautiously.

Impact of Hermodice carunculata (Pallas, 1766) (Polychaeta: Amphinomidae) on artisanal fishery: A case study from the Mediterranean sea

Invasive species can cause severe economic damages, ecosystem alterations, and can even threat human health. In the global warming scenario, which can act as a driving force for the expansion of thermophilic species, we investigated for the first time the economic damage caused by the invasive bearded fireworm, Hermodice carunculata, to artisanal longline fishery in the Mediterranean Sea. We focused on bottom longline fishery targeting the highly prized white seabream Diplodus sargus, investigating catch composition of the fishing gear and Catch Per Unit Effort (CPUE) of species caught, with particular emphasis on the economic damage caused by the bearded fireworm, H. carunculata, in relation to water temperature. Our results clearly indicated direct and indirect economic damage to fishing activities practiced in the southeastern coast of Sicily (Ionian Sea). Type and extent of the damage caused by the invasive worm (H. carunculata) were discussed in relation to temporal scale and overall yields obtained by this traditional artisanal fishery, and some solutions are proposed. However, the actual situation requires special attention because it is expected to worsen in the context of the global warming future scenarios, such that further studies are urgently needed.

Pengaruh fase bulan terhadap produktivitas hasil tangkapan bagan apung di perairan teluk Mutiara Kabupaten Alor

Bagan Apung fishing gear is one of the fishing gear that uses light as a tool in the fishing process. Floating Bagan fishing gear is a fishing gear that produces a high enough value for fishery production. The value of marine fishery production sometimes experiences instability which can be caused by several factors including oceanographic, weather or climate factors and the period of the moon phase. The research method used in this study was observation or following the fishing operation directly on Bagan Apung as many as 16 trips. Data analysis was carried out to see the effect of the catch on the moon phase using the t test and the BNT follow-up test. The composition of the catch shows that the crescent phase has a catch composition of 33% or with a total catch of 884 kg. The first bright spring moon phase with a catch composition of 17% or with a total catch of 454 kg, the full moon phase with a composition of 13% or with a total catch of 346 kg. The second semi-bright moon phase with a composition of 37% or with a total catch of 987 kg. The results of the t test and further test (BNT) showed that there was a moon phase on the catch of Bagan Apung.

Monitoring Small-Pelagic Fishery Utilization in Java Sea Based on Fishing Log Book

The most attention issue of sustainable fisheries management is related to the availability of catch and fishing efforts data with the spatio-temporal distribution. The monitoring data plays important to evaluate the fish stock status and fishery dynamic in the waters. As dependent-fishery data, logbook data is a reliable data source for estimating the utilization rate of fish resources and designing effective regulation tools in fisheries management areas. This study aims to analyze catch composition, spatial and temporal distribution, and productivity (catch per unit effort) of small-pelagic purse seine fisheries in the Java Sea using fishing logbook data. The result shows the highest It was found that the catch composition of small pelagic purse seines was dominated by longtail tuna/kawa-kawa, scad (Decapterus spp.), and sardinella fimbriata with the highest catches annually occurring in September 2021, March 2020, and November 2019. However, the highest productivity was achieved in September 2021, May 2020 and June 2019, namely 1,290 kg/setting/day, 1,700 kg/setting/day, and 1,660 kg/setting/day, respectively. Regarding spatial distribution, the highest productivity was in the northern and central parts of the Java Sea and the southern parts of Kalimantan.