研究目的
Investigating whether the addition of low-powered purple and white light-emitting diode (LED) fishing lights inside the pots could improve catch rates of snow crab in the Barents Sea.
研究成果
Pots equipped with purple LED fishing lights caught 12.8% more legal-sized snow crab than control pots, indicating a potential method to improve catch rates. However, the economic viability of using LED lights in the commercial fishery is uncertain due to high costs.
研究不足
The economic benefits of using underwater lights in pots remain unclear given the high capital investment required. The study also noted low catch rates in the Barents Sea, which may affect the generalizability of the findings.
1：Experimental Design and Method Selection:
Comparative fishing experiments were conducted in June 2017 and February 2018 in the Barents Sea to evaluate the effect of LED lights on snow crab catch rates.
2：Sample Selection and Data Sources:
Snow crab (Chionoecetes opilio) was the target species, with legal-sized male crabs being the focus.
3：List of Experimental Equipment and Materials:
Small Japanese-style conical pots, ElectralumeVR fishing lights (purple and white), frozen squid (Illex illecebrosus) as bait, and polyethylene bait protection bags.
4：Experimental Procedures and Operational Workflow:
Pots were baited and equipped with LED lights, deployed in fleets, and retrieved after varying soak times. Catch data were recorded, and crabs were measured for carapace width.
5：Data Analysis Methods:
Generalized linear mixed-effect models (GLMM) were used to analyze catch per unit effort (CPUE) and size selectivity.
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