| 桁杆虾拖网圆形分隔装置的效果分析 |
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| 引用本文： | 冯春雷,徐国栋,黄洪亮,张勋,李灵智,张禹,陈雪忠.桁杆虾拖网圆形分隔装置的效果分析[J].海洋渔业,2011,33(1):91-98. |
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| 作者姓名： | 冯春雷 徐国栋 黄洪亮 张勋 李灵智 张禹 陈雪忠 |
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| 作者单位： | 1. 中国水产科学研究院东海水产研究所,农业部海洋与河口渔业重点开放实验室,上海,200090
2. 上海海洋大学海海洋科学学院,上海,201306 |
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| 基金项目： | 科技部社会公益专项项目，国家"十一五"科技支撑计划 |
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| 摘 要： | 在桁杆虾拖网中间一只网囊前部加装圆形分隔装置,并在装置上部开设逃逸口.装置的格栅倾角分别为30.、45.、60.,栅条间距分别为2.5 cm、3.5 cm和4.5 cm.在逃逸口上方装有网袋,用于收集逃鱼.对装配不同倾角和不同栅条间距的装置进行了试验,根据各个网次网囊和网袋的渔获组成和体长分布情况,分析装置的分隔效果....
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| 关 键 词： | 分隔装置 选择性 桁杆虾拖网 |
Efficiency analysis on the circular separator device for shrimp beam trawl |
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| FENG Chun-lei,Xu Guo-dong,HUANG Hong-liang,ZHANG Xun,LI Ling-zhi,ZHANG Yu,CHEN Xue-zhong.Efficiency analysis on the circular separator device for shrimp beam trawl[J].Marine Fisheries,2011,33(1):91-98. |
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| Authors: | FENG Chun-lei Xu Guo-dong HUANG Hong-liang ZHANG Xun LI Ling-zhi ZHANG Yu CHEN Xue-zhong |
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| Abstract: | The circular separator device was set in front of the middle cod end of shrimp beam trawl,and an escape window was above the device.The inclination angles of the grid were 30°,45° and 60° and the space between the bars were 2.5 cm,3.5 cm and 4.5 cm respectively.A bag net covered the escape window to collect the escapees.The experiment was conducted with different angles and grid space.Separating effect of the device was analyzed through catch constitution and fish body length distribution of catch of cod end and bag net.Results indicated that: the pass-ratio of shrimp increased with the grid space.When the grid space was 2.5 cm,the pass-ratio decreased by the inclination.But most of the shrimp could get through the bars when the grid space reached 4.5 cm.When the grid space was 2.5 cm or 3.5 cm,more than 65% of flat shape fishes could escape from the trawl and caught by the bag net,and the pass-ratio increased with the angle.The ratio of dominated body length(150-200 mm) reduced to 45% when the grid was 4.5cm,and 70% of those with body length over 180 mm could be separated by the device.Because most of compressiform fishes were small,the separating efficiency was obviously good when the grid space was 2.5 cm.Most of the dominated body length(60-80 mm) fishes could not be separated when the grid space was 4.5 cm,and only those with body length over 110 mm could be separated when the inclination angle was 45°.It suggested that the device with 3.5 cm grid space and 45° angle was the ideal choice. |
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| Keywords: | Separator device selectivity shrimp beam trawl |
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