Effect of an escape vent in accordion-shaped traps on the catch and size of Asian paddle crabs Charybdis japonica in an artificial reef area

文献类型： 外文期刊

第一作者： Zhang Peng

作者： Zhang Peng;Li Chao;Li Wentao;Zhang Xiumei;Zhang Peng;Zhang Peng;Zhang Xiumei

作者机构：

关键词： Charybdis japonica; accordion-shaped trap; escape vent; selectivity; artificial reef area

期刊名称：CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY （ 影响因子：1.068； 五年影响因子：0.983 ）

ISSN： 0254-4059

年卷期： 2016 年 34 卷 6 期

页码：

收录情况： SCI

摘要： Accordion-shaped traps are widely used in China to catch the Asian paddle crab Charybdis japonica but traps of conventional design often catch juvenile crabs. A new type of accordion-shaped trap with an escape vent (LxW=4.3 cmx3.0 cm) was designed and a comparative study between the newly designed and conventional traps was performed in the artificial reef area of Zhuwang, Laizhou Bay, China from June to August 2012. The mean catch per unit effort (CPUE) of undersized crabs was significantly lower in the vented traps than in the conventional traps (paired t -test, n=30, P < 0.001), while the CPUE of marketable crabs was significantly higher in the vented traps (paired t-test, n=30, P < 0.001). The mean size of crabs (carapace length) caught in the vented traps was significantly larger than in conventional traps (paired t-test, n=29, P < 0.001). The ratio of undersized crabs was 35.05 +/- 2.57% in conventional traps and 12.53 +/- 0.69% in vented traps (significantly lower, paired t-test, n=29, P < 0.001). Therefore, a 4.3 cmx3.0 cm escape vent was considered appropriate for C. japonica fishing in the artificial reef area. This finding will assist the development of more sustainable and efficient crab fishing methods using accordion-shaped traps.

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