EFFECT OF TOW DURATION ON LENGTH COMPOSITION OF TRAWL CATCHES

被引：58

作者：

GODO, OR

PENNINGTON, M

VOLSTAD, JH

机构：

[1] Institute of Marine Research, N-5024 Bergen

[2] National Marine Fisheries Service, Woods Hole Laboratory, Woods Hole

来源：

FISHERIES RESEARCH | 1990年 / 9卷 / 02期

关键词：

D O I：

10.1016/0165-7836(90)90062-Z

中图分类号：

S9 [水产、渔业];

学科分类号：

0908 ;

摘要：

The standard tow duration for trawl surveys is normally from 30 min to 2 h. In this paper we investigate if catch rates for different size groups change for varying durations of from 5 min to 2 h. Data for cod, haddock and long rough dab from the Barents Sea and Georges Bank are analyzed. Owing to small fish-large fish differences in swimming capacity, a relative decrease in catch rates of large fish with decreasing tow duration is expected. The results show no significant change in mean length with varying tow duration. It is indicated that short tows are at least as efficient as long tows in catching fish of any size. A hypothesis is proposed to explain this discrepancy from expectation. The results suggest that the efficiency of trawl surveys can be increased by reducing tow duration. © 1990.

引用

页码：165 / 179

页数：15

共 18 条

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