鲤鱼在双向脉冲电场中的反应及带电兜式拉网的设计

本文将难以捕捞的鲤鱼为主要研究对象,测定了鲤鱼在 x/4双向脉冲电场中的感电场强、电流阈值以及双极式线状电极的感电范围。采用电场与网具互补和紧密配合的技术路线,在兜式拉网底纲设置合理电场阻止鱼类钻纲,底纲加设网兜堵塞“抬纲”产生的逃鱼“漏洞”,较好地摸索了底层鱼的捕捞技术。面积0.67公顷圈养区3网鲤鱼捕获率为85～96％,10公顷圈养区5网捕获率为87％。与传统渔具渔法相比,提高鲤鱼单位网次捕获率10倍以上。

THE RESPONSES OF COMMDN CARP IN TWO-WAY PULSE GROUND AND DESIGN OF BLOCKING NET WITH ELECTRICAL CUD END

By using common carp as main object of this studp, the electri-city-sensing field intensity, the threshold electric curxent value of #ish in c/4twe-way pulse ground and the electricity-sensing range of two-line electrode polewere determined. Since the successful technical way referred electric groundin eonjunction with fishing gear reasonable electric ground could be foamedefficiently in leadline the blocking net, so as to block up fish's escapethxau leadline. A cod end was supplemented in the leadline for purpose ofstoppirg up fish's escape loopholes due to the "rising of leadline" during thefishing operation. Thus,the difficult pxablem for catching freshwater bottom fishwas effectively solved. An average catching rate of 85-98 could be attained inthree hauls for common carp in a. fiT ha of enclosed fish farming area and an, eve-rage catching rate of 8Tin five hauls in 10 ha of enclosed fish faxming areacould be obtained. The catch rate is raised to la times as compare with the tradi-tional fishing method.