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Effect of escape vents on retention and size selectivity of crab pots for swimming crab Portunus trituberculatus in the East China Sea

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Aquaculture and Fisheries 2021年第4期6卷 340-347页

作者： Jian Zhang Zhanwen Pei Pingguo He Jiangao Shi College of Marine Sciences Shanghai Ocean UniversityShanghai201306China National Engineering Research Centre for Oceanic Fisheries Shanghai Ocean UniversityShanghai201306China Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources Ministry of EducationShanghai Ocean UniversityShanghai201306China School for Marine Science and Technology University of Massachusetts DartmouthNew BedfordMA02747-2300USA East China Sea Fisheries Research Institute Chinese Academy of Fishery SciencesShanghai200090China

An increase in the crab pot fishery in the East China Sea has caused great pressure on swimming crab Portunus trituberculatus resources.Thus,it is essential to implement suitable measures to release sublegal-sized crabs to increase the number of recruits for legal-sized crabs.One of the measures considered is the installation of escape vents on crab pots.We tested crab pots with one and two escape vents and compared the catchability and size selectivity of these pots with control pots without an escape vent.Pots with one escape vent located on single side of the pot,top or bottom(SS),and another on both sides at top and bottom edges(BS)were tested in sea trial experiments following typical commercial fishing practice.The results show that both SS pots and BS pots caught significantly smaller number of sublegal-sized crabs(escape vents,taken as the fixed effect,on selectivity parameters and indexes was analyzed by hypothesis testing.The results show that null hypothesis of no effect of location of vents on size selectivity cannot be rejected,indicating that there is no significant difference in size selectivity between the two types of pots for P.trituberculatus.

关键词： Crab pots Portunus trituberculatus escape vents Retention Size selection Location

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Effectiveness of escape vent shape in crab pots for releasing swimming crab Portunus trituberculatus in the East China sea

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Aquaculture and Fisheries 2023年第3期8卷 332-340页

作者： Jian Zhang Xiaofei Shi Pingguo He Jiangao Shi College of Marine Sciences Shanghai Ocean UniversityShanghai201306China National Engineering Research Centre for Oceanic Fisheries Shanghai Ocean UniversityShanghai201306China Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources Ministry of EducationShanghai Ocean UniversityShanghai201306China School for Marine Science and Technology University of Massachusetts DartmouthNew BedfordMA02744USA East China Sea Fisheries Research Institute Chinese Academy of Fishery SciencesShanghai200090China

To stop the decline of swimming crab(Portunus trituberculatus)stocks in the East China Sea,escape vents on crab pots are urgently required to improve pot selectivity and enable release of sublegal-sized crabs.This study presents field comparative fishing experiments,which examined the effectiveness of different shapes and sizes of escape vents in crab pots for the release of swimming crabs.Two sizes each of rectangular,elliptic,and circular escape vents were tested.The results of comparative fishing experiments indicated that experimental pots with escape vents,regardless of their configuration,caught significantly fewer sublegal-sized crabs(vents produced steeper selectivity curves than elliptic and circular escape vents.This indicates that rectangular vents may be more suitable and controllable when escape vents will become a requirement and their use will be enforced in fisheries.Underwater observations were conducted using GoPro cameras and LED lights during the first 2.5 h of the deployments(which usually lasted between 5 and 12 h).Video recordings of experimental pots equipped with rectangular or elliptic escape vents showed that swimming crabs trapped in the pots could detect the vents,and readily approached and passed through these.However,no significant difference was detected in the response behavior of swimming crabs between rectangular and elliptic vent pots when quantitative indicators,derived from video recordings,were compared.The effect of different vent shapes on the escape behavior of swimming crab gradually manifested as an increased soak time and by the onset of the escape of larger crabs.Future underwater observations should thus last the entire duration of pot soaking to study how crabs escape from the pots.

关键词： Crab pots Portunus trituberculatus escape vents Vent shape Size selection Underwater observation

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