Robin Mahon and Robert W. Smith
Marine Fish Division, Bedford Institute of Oceanography
Dartmouth, Nova Scotia, Canada B2Y 4A2
Source - Journal of Northwest Atlantic Fishery Science, Volume 9(1): 73-79
ISSN-0250-6408
Mahon, R. and Smith, R.W. 1989. Comparison of Species Composition in a Bottom Trawl Calibration Experiment. J. Northw. Atl. Fish. Sci. 9(1): 73-79. https://doi.org/10.2960/J.v9.a6
Abstract
The species composition in a comparative trawl fishing experiment on the Scotian Shelf was analysed to determine if two ships using different gear resulted in different pictures of assemblage structure. A multiple regression technique was used with an index of biological dissimilarity as the dependent variable, and dummy variables to control day-night differences, sampling stratum and location. The analysis showed that the dissimilarity index values between vessels were not significantly larger than those within vessels. Pairs of tows by the different vessels and gear at the same location, were significantly less dissimilar than pairs of tows by the same vessel in the same sampling stratum (i.e. nearby). The study shows that it is valid to compare assemblage structure on the basis of surveys by these two vessels. The results also suggest that there are spatial patterns in the demersal fish assemblages on the Scotian Shelf at a scale between the area covered by a trawl tow and the area of a stratum.
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Language - English
Publisher - Northwest Atlantic Fisheries Organization (NAFO), Dartmouth, N.S., Canada
Publication Date - September 1989
Publication Type - Journal Article
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