西撒哈拉沿海章鱼拖网的改进试验

THE FISHING IMPROVEMENT TEST OF OCTOPUS TRAWLNET IN THE WEST SAHARA WATERS

摘要:

本文阐述中国渔船在西撒哈拉沿海捕捞章鱼的单拖网的改进和试验结果。这一结果表明，适当改变原有网具的某些尺度和参数，能改变网具在作业中的性状。使其扩张、贴底、轻重、稳定、导鱼、惊扰、驱集等性能更适应于该海域章鱼的生物学习性。从而提高了产量。改进后的网具从1993年7月17日起投产。至12月11日告一段落。对比生产表明。新网性能良好。产量、产值同步增长了17％。由此揭示了这类网具改革中若干值得重视和探讨的问题。现在，这项改革试验的结果已在部分中国渔船中推广应用。

Abstract:

In this paper the results of the fishing improvement test for the octopus trawlnet operated by Chinese fishing vessels in the West Sahara waters were conducted. The results showed that it is possible to improve net per formance and make it more adaptable to the behaviour of octopus by modifying some dimensions and parameters of the net.The improvement design included expanding main dimension of the net, such as net length, net mouth circumference, lengths of both headrope and groundrope, increasing the weight of the groundrope, and changing the length and distribution of three tickler chains in order to improve the property of the spreading, bottom-touching stability, fish-guiding of the net and disturbance of the tickler chains.The new-designed net has been operated in the Waters from July 17th to December llth, l993. Both the production and output value all incereased more than 17%.The results of this test indicated some important considerations, to which more attention should be paid in further improving trawlnet performance.