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中文摘要：
张网Y型释放装置能够有效改善张网渔具选择性,为探究不同规格栅栏间距的选择性差异,该试验共设置3组栅栏间距（10 mm、15 mm、20 mm）,于2015年12月在舟山嵊泗进行海上试验,捕捞渔获优势种为口虾蛄（Oratosquilla oratoria）、三疣梭子蟹（Portunus trituberculatus）,采用联合网次数据分析该释放装置不同栅栏间距对口虾蛄、三疣梭子蟹的选择性。结果显示口虾蛄、三疣梭子蟹选择性指标50%选择体长/甲宽（L50）随着释放栅栏间距的增加不断增大,口虾蛄、三疣梭子蟹选择范围（SR）则随着栅栏间距的增加不断减少。表明Y型释放装置可有效用于释放小个体口虾蛄、三疣梭子蟹等甲壳类生物,但是适宜的释放间距仍需进一步的试验研究。
英文摘要：
Y-shaped exclusion device can improve the selectivity of Chinese stow net effectively. In order to study the selectivity differ- ence of barrier spacing at different sizes, 10-mm, 15-mm and 20-mm barrier spacings were set in this trial. The trial was carried out in Shengsi, Zhoushan in December, 2015, and the dominant species of the catches were mantis shrimp （Oratosquilla oratoria） and swimming crab （Portunus trituberculatus）. We then analyzed the selectivity on Y-shaped exclusion device for the mantis shrimp and swimming crab with different barrier spacings based on the combined net data. The results show that the selectivity index Ls0 of mantis shrimp and swimming crab increased with increasing barrier spacings, while the selection range （SR） of mantis shrimp and swimming crab decreased with increasing barrier spacing, which indicates that the Y-shaped exclusion device can be used to release the crustace- ans, such as mantis shrimp and swimming crab. However, the appropriate barrier spacing still needs further study.
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