Fish Trap Research Articles

First record of Mastacembelus notophthalmus (Actinopterygii: Synbranchiformes: Mastacembelidae) for Belitung Island, Indonesia

This study was conducted aiming to record for the first time the occurrence of Mastacembelus notophthalmus Roberts, 1989 in Belitung Island (Indonesia), and update the geographic distribution of this species. Although this species is categorized as LC according to the IUCN Red List, it is rarely reported in fish inventories, with few specimens sampled. Moreover, data on the geographic distribution, population size, and other population details of M. notophthalmus are scarce and insufficient to predict possible threats and propose appropriate conservation measures and policies. A single specimen of Mastacembelus was collected using a fish trap on 20 February 2023, in a swamp, located in the middle course of the Lenggang River, Belitung Island, Indonesia. This specimen was identified as M. notophthalmus and this finding constitutes the southernmost record for this species, expanding its geographic range. In addition, the new record site is about 700 km south-east of the nearest locality in Peninsular Malaysia, about 250 km south-east of the nearest locality in Bangka Island, about 600 km south-east of the nearest locality in Sumatra, and about 500 km south-west from the nearest locality in Borneo. Better ecological and biological data concerning distribution, habitat, and stressors is crucial to reassess the conservation status of M. notophthalmus, and possible future conservation measures and policies. Therefore, we emphasize here the urgency for more comprehensive and accurate data to facilitate conservation assessments and management in Indonesia.

Eurasian otters prefer to prey on religious released non-native fish on the Qinghai-Tibetan Plateau.

Religious wildlife release is prevalent worldwide, especially in Asia countries. It is one of the anthropogenic pathways to cause biological invasions. Religious fish release is common on the Qinghai-Tibetan Plateau, yet few studies have assessed the influences of religious fish release on local species. In Yushu, a city on the Qinghai-Tibetan Plateau, we interviewed local people, conducted fish trap surveys in local rivers, and examined the diet of Eurasian otters Lutra lutra using a fecal DNA metabarcoding approach. We found that fish release started at least in 1980-1990s in Yushu. Tibetan residents released fish in large amounts and released fish were usually exotic commercial fish purchased from market. Despite such long-term and intensive fish release activities, released fish were few in local rivers. On the other hand, Eurasian otters mainly prey on fish and released fish accounted for ~20% of relative read abundance of prey DNA in otters' diet, indicating their high preference on released fish. Our study suggested that religious fish release may provide additional food resources for otters, whereas otters, as a top predator in local rivers, may deplete non-native fish once they were released and, therefore, reduce the probability of colonization of released fish, although further studies are required to assess otters' impact. Our study revealed otters' diet in Yushu, providing basic information for local otter management and conservation. Furthermore, it represents a case showing that native predators prey on religious released animals, implying a probable direction for controlling invasive species through native predator conservation.

Age Structure, Growth, and Mortality of Blue Swimming Crab (Portunus pelagicus Linnaeus,1758) in Banten Bay Waters

Blue swimming crab (BSC) (Portunus pelagicus) is the main fisheries commodity in Banten Bay, with the highest catch of catch occurring in the west monsoon. Increased fishing efforts have reduced the catch, as indicated by a decrease in the average size of carapace width. Overfishing might influence the life cycle and population structure of the BSC. This research aims to analyze the growth and mortality of the Blue Swimming Crab in Banten Bay, especially in the west monsoon. Blue swimming crab samples were obtained from the catch of fish trap and gillnet fishermen with landing sites around the Karangantu Archipelago Fishing Port. Growth, age, and mortality were predicted based on the measurement of total carapace width and body weight. Data were analyzed using Fisat II and Microsoft Excel. The frequency distribution of carapace showed one mode class which normally was distributed consisting of only one age structure group (cohort). The relationship between carapace width and weight of males or females resulted in a slope value (b>3) and was positive allometric, indicating that both sexes had a faster weight gain than the increase in carapace width. Growth parameters resulted asymptotic length (L∞); male 176.75 mm and female 176.46 mm. The growth was relatively fast, with a growth coefficient value of more than one. The mortality showed that the fishing mortality value (F);in males was 3.47 /year and in females 2.69/year was greater than the natural mortality value (M); males 1.25/year and females 1.22/year. Blue Swimming Crabs in Banten Bay had overfished as shown by the high fishing mortality value and there were still many BSC that were caught below the legal size allowed. Thus, catches should be controlled to keep the population and for sustainable fisheries.

Understanding the drivers, scale and impact of abandoned, lost and otherwise discarded fishing gear in small-scale fisheries: an Eastern Caribbean perspective

Abandoned, lost and otherwise discarded fishing gear (ALDFG) presents a significant and complex challenge which can result in severe deleterious impacts to habitats, marine wildlife, and fishing and coastal communities the world over. Small island states like the countries of the Eastern Caribbean are highly vulnerable to a range of external stressors, therefore it is essential to gain an understanding of the threat posed by all forms of marine debris including ALDFG to the sub-region. To gain an understanding of the drivers, scale and impact of the threat associated with small-scale fisheries of the Eastern Caribbean, interviews with 49 fish trap and line fishers as well as 14 divers in Antigua and Barbuda, and Dominica were conducted. Interviews were completed over the course of two months (July – August 2022) at landing sites around all three islands. Fish traps continue to be a major contributor to ALDFG in the study area, with an estimated 2, 273 traps and 2, 567 being lost on Antigua and Barbuda, and Dominica respectively, based on the most recent estimates of the fishing fleet. Severe weather and snagging of benthic obstructions have emerged as the most significant contributors to fish trap loss in both countries while towing of fishing lines was the most frequently identified cause in the countries’ line fisheries. Observed variabilities in drivers of loss between both countries may be attributed to a number of factors including diversities in the fishing sectors, differences in local practices and heterogeneity in the biogeography of the marine environment. Further, evidence shows that the challenge of ALDFG within the Eastern Caribbean context, goes beyond local drivers of loss and may be influenced by transboundary inputs from both within and outside the region. Divers reported encountering not only ALDFG originating from within the two countries but some forms of ALDFG that may have drifted into the area from neighbouring islands (MFAD components) or further afield (polypropylene netting). Managing this challenge effectively will require not only fisheries specific interventions but the cooperation and collaboration of pool of stakeholders both nationally and beyond.

Length Weight Relationship and Enviromental Condition of Red Snapper (Lutjanus sp.) of Polyvinyl Chloride (PVC) Modified Trap Fishing in Bunyu Waters

The characteristics of Bunyu Island as a small island which was surrounded by the sea, has capture fisheries resource potential in an abundant, one of them is red snapper (Lutjanus sp.). These fish was caught by using bottom fish pots from bamboo with one entrance. The aims of the study were to determine the weight length and the aquatics environmental conditions correlation of the red snapper fishing ground (Lutjanus sp.) which was caught by modified bottom fish pots with poly vinyl chloride (PVC) in Bunyu Waters. The research was conducted in September - October 2020. The results showed that the growth of red snapper was negative allometric. The results of partial and simultaneous regression tests show that there is no positive effect of water condition factors (temperature, dissolved oxygen, salinity and brightness) on catches of red snapper (Lutjanus sp.) with modified bottom fish pots

Мониторинг промысла синего краба (Paralithodes platypus Brandt) в горле залива Шелихова в январе 2018 года

It is stated that January there is the most intensive blue crab fishing period in the Shelikhov Bay during the year. At the same time, the catch of males of commercial size per day was 13.474 tons or 7600 pcs. However, this value does not reflect the real possibility of catching per day, since it is limited to the possibility of raw material processing per day (15–16 tons). Information on the size-weight composition of catches and the biological state of crabs is given, as well as the species composition of the by-catch of other species of fish and invertebrates in trap fishing is analyzed.

Analysis of Maritime Content in the Project for Strengthening the Profile of Pancasila Students (P-5) as an Educational Media in Getting to Know the Culture of Coastal Communities at SMP Negeri 19 Bintan (Activist School Batch 2)

The Driving School Program is a program that focuses on developing comprehensive learning outcomes, including skills (literacy and numeracy) and character, starting from school principals and teachers. This program is an evolution of the previous school conversion program. This program will also advance public/private schools in all school conditions one or two steps forward. The program is implemented in stages and integrated into the school ecosystem until all schools in Indonesia become driving schools. SMP N 19 is one of the second-generation schools in the Riau Islands, and this school is in Kelong village, located in the coastal area of Bintan. Given the conditions of coastal areas, schools choose P-5 activities tailored to the cultural conditions of coastal communities and student characteristics. Most of the students’ parents’ jobs are as fishermen. The P-5 topics chosen at this school are adapted to these conditions. The P-5 theme that has been implemented has 2 maritime themes; theme 1 is “Local Wisdom” with the title The Fun of Making Fish Traps at my School, and theme 2 is “Entrepreneurship: with the title Fish Processing and Preservation, building an entrepreneurial spirit from an early age. Theme 3 is still local wisdom with the title “My marine waste is valuable” through the P-5 themes, which are implemented as a form of school providing education to students to get to know the culture of coastal communities.

An archaeological example of Aboriginal management of a hydro-ecological system in the Murray River valley, South Australia

Context A rare archaeological example of Aboriginal water management in a Murray River floodplain upstream of Renmark is described and contextualised. Aims Historical accounts, archaeological descriptions and hydrological modelling are used to propose a likely function of the site. Methods The site was documented through archaeological field recording, a digital elevation model (DEM) developed through a real-time kinematic (RTK) survey and flood inundation modelling (FIM), and is interpreted through a review of archival and documentary sources. Key results The site represents one of only a few extant physical examples of Aboriginal water management in the Riverland and greater Murray–Darling Basin. Conclusions Our assessment indicates that Aboriginal people had excavated an artifical channel within the Calperum floodplain in order to manipulate natural water connectivity, most likely as part of a fish trap or weir structure. Implications The site builds an appreciation of the complexity of Aboriginal land practices and supports the impression gained though historical accounts of a curated and managed riverscape.

Fishway performance of adult Chinook salmon completing one of the world's longest inland salmon migrations to the upper Yukon River

Fishways can restore functional connectivity within rivers for migratory fish where barriers compromise connectivity. Providing fish passage is particularly important for semelparous, anadromous species that require access to upriver habitats to successfully reproduce. From 2017 to 2020, we used a combination of acoustic and radio telemetry to investigate the passage success of Chinook salmon (Oncorhynchus tshawytscha) in the upper Yukon River through the wooden Whitehorse Rapids Fishway and compared this to the migration of salmon in the nearby free-flowing Takhini River. The upper Yukon River population of Chinook salmon studied here is highly unique, completing a 2800 km inland migration to Whitehorse, YT, before attempting to pass the Whitehorse Hydro Plant (WHP) to reach spawning sites upstream. We found that upstream passage success was variable across four years of study (0%–66%), was low overall at 31%, and was considerably lower for female salmon. In contrast, salmon migrating up the free-flowing Takhini River had high migration success to spawning grounds and had many times faster migration rates. Attraction (86%), entrance (77%), and passage efficiency (36%) were less than that reported for Chinook salmon at other fishways. Within the fishway, a disproportionately high number of salmon returned downstream upon reaching a daytime-operated viewing chamber (fish trap) located ∼115 m up the fishway. Upon passing the fishway, salmon had high migration success to spawning grounds, though 12% of salmon returned downstream of the WHP, typically after multiple days and after traveling dozens of kilometres upstream of the facility. Findings from this study reveal opportunities to improve fishway performance and thus connectivity for one of the world's most impressive animal migrations.

Maximizing salmonid bycatch survival with passively operated commercial fish traps

Commercial fish traps were recently implemented at a limited scale in the lower Columbia River in efforts to selectively harvest hatchery-origin fishes with minimal mortality of wild-origin salmonids listed under the U.S. Endangered Species Act. Prior studies of a modified passive trapping technique demonstrated nearly 100 % survival among adult salmonids released as bycatch. Building upon this research, additional survival studies for adult coho salmon, spring-run Chinook salmon, and summer-run Chinook salmon were conducted between 2019 and 2021 at two separate fish trap sites in the lower Columbia River. Over three years of study, we used mark-recapture and net pen holding methodologies to estimate post-release survival of Chinook salmon and coho salmon, respectively. Evaluating detections of Chinook salmon tagged and released from a passively operated fish trap in 2019, detection at Bonneville Dam over a mean 6.5 d upriver migration (167 km) was 1.000 (95 % CI: S ≥ 0.970) for the sample genetically assigned to populations originating upriver of Bonneville Dam. Through two separate net pen holding studies, post-release survival of coho salmon was estimated at 1.000 (95 % CI: S ≥ 0.975) over 4 d in 2020 and 0.965 (95 % CI: 0.948 ≤ S ≤ 0.969) over 6 d in 2021. Given that these analyses lacked control groups to adjust survival estimates for confounding mortality effects, study results are inherently conservative. Ultimately, the findings of our research support the conclusions of prior studies and further suggest that passively operated fish traps may allow for selective harvesting of targeted fish stocks with little to no mortality of adult salmonid bycatch.

Analisys of lead (Pb) Heavy Metal Content in Climbing Perch Fish (Anabas testudineus) Derived from Rawa Taliwang Lake, West Sumbawa Regency 2021

Rawa Taliwang Lake as an Nature Park in West Sumbawa Regency have an economic value for the fishermens and fish traders from Climbing Perch fish (Anabas testudinesu). Consuming Heavy metals content in climbing perch fish will be damaged human body. This research aims to analysis of lead (Pb) heavy metal content in climbing perch fish (Anabas testudineus) derived from Rawa Taliwang Lake, West Sumbawa Regency 2021. This research was conducted for two months, starting from September - October 2021. Sampling was carried out by purposive sampling method at 2 research stations. Fish samples were taken are 2 fishes from each station using traditional rattan fish trap. The fish species taken were climbing perch fish. The research sample was then analyzed in the West Nusa Tenggara Health, Testing and Calibration Laboratory. The data analysis was carried out by taking muscle tissue from headsnake fish and then analyzing the content of heavy metal in the from lead using AAS (Atomic Absorbtion Spectrophotometry). The measurement result showed that heavy metal content of lead in climbing perch fish from Rawa Taliwang Lake 0,1 mg/kg (ppm) or still under the maximum standard by Food and Drug Supervisory Agency (BPOM) No.5 of 2018 concerning the Maximum Limit of Heavy Metal Contamination in Processed Food which is 0,2 mg/kg.

Practical Approaches for Providing Empirical Data on Seabird Behavior and Prey Assemblages in Tidal Channels

Persisting knowledge gaps relating to the ecological context and potential environmental impacts of marine renewable energy (MRE) devices continue to add substantial costs and uncertainty to MRE projects globally. Increasingly sophisticated technological approaches to environmental monitoring can have fundamental non-trivial shortcomings for environmental impact assessment (EIA), whilst substantial practical and financial costs of deployments can prevent their application. For the tidal stream energy (TSE) sector, there is a need for practical and cost-effective methods that can provide site-specific information on predator behavior and associated prey assemblages. Considering existing knowledge of animal communities in tidal channel environments, a proportional approach using shore-based observation and baited fish trap methods was developed. During April 2021, a trial of these methods was conducted in tidal channel environments in Shetland, UK. The practical application of the proposed approach is demonstrated here with results from three tidal channels including Bluemull Sound, the site of active TSE installations (the Shetland Tidal Array). Observation of predator behavior across the study sites are reported for great cormorant Phalacrocorax carbo and European shag Phalacrocorax aristotelis. Seabird diving data calculated from the shore-based observations provided metrics relevant to informing EIA and collision risk modelling including dive duration, dives per minute, and % time underwater. Fish trap deployments targeted the benthic and demersal prey of these predators in the three study sites and across a range of depths and hydrodynamic conditions. A variety of fish and invertebrate species known to be important components of benthic-foraging seabird diet were successfully captured by the traps, providing basic biological information on the prey assemblages observed in each site. The fish species observed in the highest abundance were saithe Pollachius virens and cod Gadus morhua. Benefits, limitations, and applications of this approach are discussed along with various factors relating to the performance of both methods. The shore-based observations rapidly identified relevant patterns in predator foraging activity which informed the targeted deployment of fish traps to provide complementary prey data. This novel combined approach has potential to reduce costs and uncertainty in EIA and for supporting the responsible development of the MRE industry.

Analysis of Cadmium (Cd) Heavy Metal Content in Headsnake Fish (Channa striata) Derived from Rawa Taliwang Lake, West Sumbawa Regency 2021

Fish is one of the aquatic organisms that is often used as a biological indicators of heavy metals in waters. The purpose of the research about analysis of cadmium (Cd) heavy metal content in headsnake fish (Channa striata) derived from Rawa Taliwang Lake, West Sumbawa Regency 2021 is to determine the cadmium in headsnake fish from Rawa Taliwang Lake. The research was conducted for 2 months, starting from September-October 2021. Sampling was carried out by purposive sampling at 2 research stations. Fish samples were taken 2 fishes at each station using gill nets and plaited rattan fish trap. The fish species taken were headsnake fish. The research sample was then analyzed in the West Nusa Tenggara Health, Testing and Calibration Laboratory. The data analysis was carried out by taking muscle tissue from headsnake fish and then analyzing the content of heavy metal in the from cadmium using AAS (Atomic Absorbtion Spectrophotometry). The measurement result showed that heavy metal content of cadmium in headsnake fish from Rawa Taliwang Lake ranged from 0,115 mg/kg (ppm) to 0,161 mg/kg (ppm). This shows that Rawa Taliwang Lake has been contaminated by cadmium exceeds the threshold set by Food and Drug Supervisory Agency (BPOM) No.5 of 2018 concerning the Maximum Limit of Heavy Metal Contamination in Processed Food which is 0,1 mg/kg.

An account of the traditional trap fishing in a reservoir of south Tamil Nadu

The traditional knowledge of fishing small indigenous fishes in rivers practiced by the Kanikkaran tribal community living along rivulets and tributaries of rivers running down from Western Ghats was explored. The Pechiparai reservoir is native to a variety of fishes and the local inhabitants generate subsidiary income by fishing and sale of fishes caught from the rivers. A small circular trap made by them was the fishing tool with a handful of feed serving as an attractant for the fishes. On average, 200 numbers of live fish per day have been found to be harvested within 5-6 hours. The advantage of the trap is that it is less damaging to fishes and the captured fishes remain active. This traditional fishing method is acclaimed by the fishers who felt this harvest technique as a sustainable fishing practice. The present analysis revealed that this community had a thorough knowledge on various fish species and their habitats, with knowledge on the geographical features of lower stretches of the reservoir.

A analysis of occupational accidents in the Korea trap fishing vessel

A analysis of occupational accidents in the Korea trap fishing vessel

Time series covering up to four decades reveals major changes and drivers of marine growth and proportion of repeat spawners in an Atlantic salmon population.

Wild Atlantic salmon populations have declined in many regions and are affected by diverse natural and anthropogenic factors. To facilitate management guidelines, precise knowledge of mechanisms driving population changes in demographics and life history traits is needed.Our analyses were conducted on (a) age and growth data from scales of salmon caught by angling in the river Etneelva, Norway, covering smolt year classes from 1980 to 2018, (b) extensive sampling of the whole spawning run in the fish trap from 2013 onwards, and (c) time series of sea surface temperature, zooplankton biomass, and salmon lice infestation intensity.Marine growth during the first year at sea displayed a distinct stepwise decline across the four decades. Simultaneously, the population shifted from predominantly 1SW to 2SW salmon, and the proportion of repeat spawners increased from 3 to 7%. The latter observation is most evident in females and likely due to decreased marine exploitation. Female repeat spawners tended to be less catchable than males by anglers.Depending on the time period analyzed, marine growth rate during the first year at sea was both positively and negatively associated with sea surface temperature. Zooplankton biomass was positively associated with growth, while salmon lice infestation intensity was negatively associated with growth.Collectively, these results are likely to be linked with both changes in oceanic conditions and harvest regimes. Our conflicting results regarding the influence of sea surface temperature on marine growth are likely to be caused by long‐term increases in temperature, which may have triggered (or coincided with) ecosystem shifts creating generally poorer growth conditions over time, but within shorter datasets warmer years gave generally higher growth. We encourage management authorities to expand the use of permanently monitored reference rivers with complete trapping facilities, like the river Etneelva, generating valuable long‐term data for future analyses.

폐어구 발생 저감을 위한 어업규제 개선방안에 관한 연구 - 통발어업 및 문어단지어업 중심으로 -

Until recently, illegal fishing in the coastal fishing industry in Korea has been occurring in many different ways in most industries. Among the types of illegal fishing, it is said that the problem of political and trap fishing, octopus jar fishing, and gill net fishing, which are for fishery regulation measures under the fisheries related laws and regulations, is causingwaste fishing gear. In particular, most of these fisheries, trap fishing and octopus jar fishing, are illegal fishing that violates the rules of operation, and many occurrence wast fishing gear are generated during fishing, whether intentionally or fruitfully. Therefore, it destroys the fragile marine ecosystem environment and causes ghost fishing. And it is leading to the decrease of fishery resources, and many problems are raised in terms of protection and management of fishery resources, and the damage is enormous. In other words, about 380 billion won of fishery damage, which is 10% of the annual catch, is occurring due to the waste fish. In addition, when waste fishes made of styrofoam, plastic, and nylon nets for wast fishing gear are left in the sea for a long time, microplastics are generated, and when marine organisms ingest them and eventually come to our table, human beings finally ingest substances that are very harmful to the human body. For this reason, advanced countries including the World Food and Agriculture Organization and the United Nations Environment Program are seeking active management measures to reduce the occurrence of waste fishing gear, which is caused by marine ecosystem environmental pollution and ghost fishing due to the occurrence of waste fish. This study sought ways to reduce the occurrence of waste fishing gear by eradicating violations of fishing regulations on trap fishing and octopus jar fishery which are reducing fishery resources by marine ecosystem contamination and ghost fishing by illegal fishing Therefore, the present laws and regulations related to fishery regulation are reviewed and the problems are considered to suggest legal improvement measures to reduce the occurrence of waste fishing gear

Ecological value of the earliest human manipulated coastal habitats: Preliminary insights into the nursery function of a pre-colonial stonewalled fish trap in South Africa

Pre-colonial stonewalled fish traps, an ancient engineering feat in the intertidal region, represent the earliest proof of human manipulation of the coastline in Southern Africa, specifically by the First Indigenous Peoples of South Africa. We investigated the ecologically functioning of a fish trap located on the southeast coast of South Africa from a larval fish and invertebrate perspective. This research was done in collaboration with the Khoi traditional custodians of the area of study. Samples were collected using a light trap on four separate spring tide occasions, deployed for 3 consecutive nights during 2 full moon trips and 2 new moon trips during the known peak larval settlement period (November 2020–February 2021). Although time-dependent, the importance of this novel microhabitat for the development of coastal fishes and invertebrates was highlighted. Even with the high intertidal location of the stonewalled fish trap sampled at Cape Recife, the presence of a pool of permanent non-stagnant water within the fish trap, even during low spring tide, could provide protection to larvae, in the form of more stable environmental conditions, as well as less exposure to marine predators and harsh physical environmental conditions. This research aims to raise awareness of the stonewalled fish traps located on the southeast of South Africa with a view towards developing a more inclusive management of these marine cultural heritage sites, specifically involving the First Indigenous Peoples of South Africa.

트롤조사에 의한 제주 서쪽 해역에서의 해저 폐기물 조사

This study analyzed distribution density in relation with sea-bed waste at the west fishing grounds of Jeju island by bottom trawl of nine-times in June, August 2019, July, November 2020 and June 2021. Through the 9 times’ survey many sea-bed wastes were collected at the west fishing grounds of Jeju island. The kinds of collected sea-bed waste were the fish traps(42pcs), the octopus pots(3pcs), the eel fish trap(8pcs), the waste nets(6pcs), the fishing lines(2pcs) and so on(27pcs). The total quantity investigated were 88pcs and total weight investigated were 690.4Kg in relation with sea-bed waste of the survey area. The Quantity density in relation with sea-bed waste of the survey area was 30.8pcs/km² and the weight density was 337.4kg/km². Of the total fish traps(50pcs) including the eel fish trip the broken fish trap were 32 traps (64%) and the intact fish trap were 18 traps (36%). As a result of survey of sea-bed waste in the Jeju west fishing grounds were polluted by the sea-bed waste and we need continuous monitoring to get rid of this environment pollution.

Behavioral response and retinal adaptation of Blue swimming crab (Portunus pelagicus) exposed to LED lights – Led light as a potential artificial attractant in trap fishing

Trap fishing offers many potential benefits such as high catch quality and the possibility to release unwanted catch alive. The use of wild fish as a bait in trap fishing, however, can be troublesome and may involve sustainability concerns. There is a need for accessible and sustainable alternative attractant that is not based on marine resources which can be used for human consumption. To reduce reliance on natural bait and to improve the catch rate of traps, underwater LED lights have recently been tested with promising results in several trap fisheries targeting crustaceans. We investigated in laboratory conditions the response and behavior of blue swimming crab towards different LED light colors and a natural bait. Our results suggest that blue swimming crab has a high preference for blue LED light. The frequency of crab moving toward attractant was highest with blue light, followed by natural bait, red light, and green light. Trap equipped with blue LED light captured 3,5 times more crabs than trap with red light. In addition, during the 60-min exposure time, a trap with blue LED light was equally effective as a trap with natural bait to retain crabs caught in a trap. Furthermore, our study shows that the rhabdom layer of blue swimming crab eyes was more pigmented with a blue light than green and red light which indicates that its eye is more sensitive to blue light. Our experiments suggest that the use of blue LED light as an attractant would be a potential alternative to natural bait. Further research, however, is required through fishing trials in natural conditions to verify the effectiveness of LED light as artificial bait to blue swimming crab.