ESCAPEMENT OF FISH DURING BOTTOM TRAWL SAMPLING - IMPLICATIONS FOR RESOURCE ASSESSMENT

被引：36

作者：

GODO, OR

WALSH, SJ

机构：

[1] Institute of Marine Research, P.O. Box 1873

[2] Department of Fisheries and Oceans, St. John's, Nfld. A1C 5X1

来源：

FISHERIES RESEARCH | 1992年 / 13卷 / 03期

关键词：

D O I：

10.1016/0165-7836(92)90082-5

中图分类号：

S9 [水产、渔业];

学科分类号：

0908 ;

摘要：

In recent years studies of escapement of groundfish species such as cod, haddock and flatfish underneath the net of survey trawls have indicated common problems in Norwegian and Canadian surveys. In this paper we compare Norweigan and Canadian data on size-dependent escapement of cod and long rough dab, species common to both areas of investigation. Although survey trawls and experimental designs differ between the two countries, the similarities in the results are striking. Trawl net efficiency estimates showed that bobbin-rigged trawls used by both countries contribute significantly to escapement, resulting in considerable variability in estimates of pre-recruits. This variability is discussed in terms of its implications for resource assessments.

引用

页码：281 / 292

页数：12

共 22 条

[1]

Anon, Report of the Arctic fisheries working group, Int. Coun. Explor. Sea, CM/Assess, 4, (1989)

[2]

Beamish, Vertical migration by demersal fish in the northwest Atlantic, Journal of the Fisheries Research Board of Canada, 23, pp. 109-139, (1966)

[3]

Ben-Tuvia, Dickson, Proceedings of the FAO conference on fish behaviour in relation to fishing techniques and tactics, FAO Fish. Rep., 62, pp. 1-884, (1969)

[4]

Doubleday, Rivard, Bottom trawl surveys, Can. Spec. Publ. Fish. Aquat. Sci., 58, pp. 1-273, (1981)

[5]

Engas, Godo, Near-bottom sampling with bottom and pelagic trawls, Int. Coun. Explor. Sea, CM/B, 15, (1987)

[6]

Engas, Godo, Escape of fish under the fishing line of a Norwegian sampling trawl and its influence on survey results, ICES Journal of Marine Science, 45, pp. 269-276, (1989)

[7]

Engas, Godo, The effect of different sweep lengths on the length composition of bottom-sampling trawl catches, ICES Journal of Marine Science, 45, pp. 263-268, (1989)

[8]

Engas, Jacobsen, Soldal, Catch comparison between rockhoppers and bobbins ground gear on the Norwegian bottom sampling trawl, Int. Coun. Explor. Sea, CM/B, 31, (1988)

[9]

Godo, Engas, Swept area variation with depth and its influence on abundance indices from trawl surveys, Journal of Northwest Atlantic Fishery Science, 9, pp. 133-139, (1989)

[10]

Godo, Sunnana, Size selection during trawl sampling of cod and haddock and its effect on abundance indices at age, Fish. Res., 13, pp. 293-310, (1992)

← 1 2 3 →