The ability to improve the selectivity of pots for the king crab
2021
Pavlenko, A.A. | Likhoshapko, A.A. | Likhograev, A.Yu. | Shmelev, S.V. | Lyutiy, C.G.
The aim of this work is to analyze the impact on crab traps’ selective properties of the use of a selective device that employs openings (“windows”) in fish netting. These “windows” are formed using sewn-in wire rings located in the lower part of net sides, and are used for escape of non-commercial crab. Methods used: Trap lines were set in the Barents Sea nearshore zone, within the 160–255 m depth range. Both types of traps, with the selective windows and without, were included in each line. The lines were taken onboard following 1 to 14 overboard days. All catch was counted and measured. The catch results of both standard and selective traps were compared and analyzed. Feature of novelty: Kamchatka crab fishery in the Barents Sea with the use of selective traps have never been performed before, and no application results of such selective device have been estimated yet. The conclusion: The performed studies proved the efficiency of the selective windows in reduction of non-commercial crab catches. The studies revealed the positive correlation between the average carapace width of the crabs caught and the selective window diameter. This confirms the potential for reduction of small-sized crab catch when using selective windows of a given size. Practical significance: the use of the selective windows will increase the trap fishing efficiency and reduce catch sorting times as well as the amount of small-sized crab exposed to the adverse factors
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