Journal Article

The dynamics of prespawning capelin (<i>Mallotus villosus socialis</i>) off the West Kamchatka coast

E. A. Naumenko

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 59, issue 5, pages 1006-1010
Published in print January 2002 | ISSN: 1054-3139
Published online January 2002 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1006/jmsc.2002.1280
The dynamics of prespawning capelin (Mallotus villosus socialis) off the West Kamchatka coast

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Pacific capelin catches for the period 1961–2000 are analysed. Biological data are used to show that spawning-stock biomass, spawning time, and size of the spawning areas were not stable. Estimates of stock biomass were made from a helicopter. Stock size, in terms of catch and estimated spawning-stock biomass, fluctuated in a two-year cycle, and differed by a factor of 10 or more from year to year. Every 20–22 years, the cycle shifted from even- to odd-numbered years. Capelin have also seemingly started to spawn earlier, coincident with a decrease in sunspot activity. The highest occupancy of spawning grounds was in 1990, when 90% of the possible habitat was used. Minimum occupation of spawning grounds was about 3%, in 1984.

Keywords: aerial surveys; capelin; cycles; spawning-stock biomass

Journal Article.  0 words. 

Subjects: Environmental Science ; Marine and Estuarine Biology

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