Ecological survey of the Notothenioid fishes in the Southern Ocean from Bouvet to Kerguelen Islands

概要

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The oceanographical cruises of the R. S. MARION-DUFRESNE to Bouvet, Marion, Crozet, Kerguelen, Heard Islands and on the seamounts Ob', Lena, Kara Dag and Skiff, from 1974 to 1982,complemented by the observations made on board of several trawlers, have made possible to compare the different species of Nototheniidae and Channichthyidae which occur in this part of the Southern Ocean and draw some ecological conclusions : relations with the environment, abundance and geographical distribution. First of all, it is noteworthy to point out the absence of Channichthyidae around Marion and Crozet Islands and their presence around Bouvet, Kerguelen and Heard. The species Notothenia squamifrons is characterized by a noticeable ubiquity and a power of adaptation to various biotopes which is not reached by other species. Champsocephalus gunnari seems to be a tracer of lightly colder water masses and its abundance is directly related with the high productive areas of zooplankton.
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