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| Selectivity of Codend Mesh of Stow Nets with Double Pile Vertical Hole in Haizhou Bay in Autumn |
| XU Qingchang, LI Xiansen, SUN Shan, FAN Gangzhou |
| Key Laboratory for Sustainable Utilization of Marine Fishery Resources, Ministry of Agriculture and Rural Affairs, Shandong Provincial Key Laboratory for Fishery Resources and Eco-environment, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China |
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Abstract A stow net with codend mesh of 25, 35, 45 and 55 mm was operated 11 times in the sea area near Haizhou Bay fishing ground N 35°02.335',E 119°24.842' in the Yellow Sea in autumn of 2018 to probe into the selectivity of stow nets through Logistic selectivity model, selectivity curve of different meshes to small yellow croaker Pseudosciaena polyactis, composition of catches, proportion of juveniles and selectivity analysis. Results showed that the dominant species caught by the stow net were small yellow croaker, silver hairtail Trichiurus lepturus and swimming crab Portunus trituberculatus in September. Escape percentage of catch weight and number was rapidly increased with the increase in the mesh size, even over 80% at mesh size of 55 mm. There were high percentages of juvenile small yellow croaker, butterfish Pampus argenteus and swimming crab, almost all juvenile fish, over 70% in silver hairtail in the catches. Based on the minimum catch length of small yellow croaker, it was concluded that the optimum mesh size of the stow net was (40.59±3.19) mm. The findings provided a scientific basis for the sustainable development of fishery resources and fishery management in Haizhou Bay.
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Received: 01 March 2019
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