Journal Article

Relationships between herring school distribution and seabed substrate derived from RoxAnn

D. G. Reid and C. D. Maravelias

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 58, issue 6, pages 1161-1173
Published in print January 2001 | ISSN: 1054-3139
Published online January 2001 | e-ISSN: 1095-9289 | DOI:
Relationships between herring school distribution and seabed substrate derived from RoxAnn

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A series of three fine-spatial-scale acoustic studies was carried out to study the relationships between herring-school distribution and the seabed substrate. The study was carried out on three separate bank areas east of Shetland in July 1993. The study areas were characterised respectively as: mainly mud with some hard ground; mixed mud, sand and hard ground; and mostly hard ground. Herring schools were identified from the echo-sounder record. The substrate was mapped using the RoxAnn seabed classification system interfaced to the same echo-sounder. The relationship between herring distribution and substrate was examined at two different levels; map-based, using contour plots of the important variables, and track-based, using individual herring schools in relation to the specific substrate type found on the survey track under the schools. Data are presented which show a strong tendency for schools to be found preferentially over hard seabeds, particularly in the track-based analysis. There also appears to be a strong relationship between herring aggregations and particular topographic features. This is discussed in relation to specific features, a low ridge and two escarpments, identified in two of the study areas.

Keywords: herring; acoustic surveys; seabed substrate; RoxAnn

Journal Article.  0 words. 

Subjects: Environmental Science ; Marine and Estuarine Biology

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