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The geographical distribution, population dynamics and reproductive biology of Boreomysis nobilis in Newfoundl and fjords

Published online by Cambridge University Press:  11 May 2009

Kirsten J. Clark  and
William Threlfall
Kirsten J. Clark
Affiliation:
Marine Fish Division, Bedford Institute of Oceanography, Department of Fisheries and Oceans, PO Box 1006, Dartmouth, Nova Scotia, B2Y 4A2, Canada
William Threlfall
Affiliation:
Department of Biology, Memorial University of Newfoundland, St John's, Newfoundland, A1B 3X9, Canada
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Extract

The hyperbenthic mysid, Boreomysis nobilis G.O. Sars, 1879 (Malacostraca: Peracarida), is reported from nine new locations around the island of Newfoundland in eastern Canada. It is commonest within and at the mouths of deep fjords and is less common or absent outside these fjords. Its absence from two bays where the depths, temperatures and salinities are all within the range inhabited by B. nobilis in other bays indicates that other factors are probably influencing local distribution patterns. The catch rates for B. nobilis are highest in the deep water within 150 m of the bottom. However, no differences were found in the vertical distribution of the different life-history stages of B. nobilis and no evidence was found for large-scale diel vertical migrations. Boreomysis nobilis was found to breed throughout the year, since all developmental stages were present on all sampling dates. However, there was a period of increased breeding activity in the late spring and early summer. An examination of the relationship between brood size, body volume of ovigerous females, and number of stage 1 larvae indicates that B. nobilis produced a smaller number of larger larvae than expected for epipelagic and coastal mysids

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 73 , Issue 4 , November 1993 , pp. 755 - 768
Copyright
Copyright © Marine Biological Association of the United Kingdom 1993

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