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Buoyancy in the Lumpsucker Cyclopterus Lumpus

Published online by Cambridge University Press:  11 May 2009

John Davenport  and
Elin Kjørsvik
John Davenport
Affiliation:
Animal Biology Group, Marine Science Laboratories, Menai Bridge, Gwynedd LL59 5EH
Elin Kjørsvik
Affiliation:
Institute of Biology and Geology, University of Tromsö, P.O. Box 3085, Guleng N-9001, Tromsö, Norway
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Extract

The lumpsucker or lumpfish, Cyclopterus lumpus L. (Cyclopteridae, Scorpaeniformes), is a cottoid teleost, and, like other fish in its family, exhibits many characteristics of a coastal, bottom-dwelling fish. It is globiform, has no swimbladder, possesses a large abdominal sucker (formed from the pelvic fins), and lays demersal eggs which are brooded by the male parent for many weeks (Fulton, 1907; Cox & Anderson, 1922; Yesipov, 1937; Zhitenev, 1970; Mochek, 1973). The species spends the breeding season in shallow water, where both sexes may be seen attached to the rocks by their suckers. Early researchers (Couch, 1863; Day, 1880–4; Smitt, 1892) believed that the adults retreated to rocky bottoms in deep water after breeding. However, later workers (Cox & Anderson, 1922; Saemundsson, 1926, 1949; Andriyashev, 1954; Bagge, 1964; Blacker, 1983; Daborn & Gregory, 1983) have demonstrated that the lumpsucker spends much of its larval and adult life living epipelagically and in mid water in coastal and oceanic areas upon macrozooplankton (e.g. ctenophores, mysids). The term ‘semi-pelagic’ seems the most appropriate label for its mode of life.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 66 , Issue 1 , February 1986 , pp. 159 - 174
Copyright
Copyright © Marine Biological Association of the United Kingdom 1986

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