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Biology and distribution of South Georgia icefish (Pseudochaenichthys georgianus) around South Georgia and Shag Rocks

Clarke, S.; Reid, W.D.K.; Collins, M.A.; Belchier, M.. 2008 Biology and distribution of South Georgia icefish (Pseudochaenichthys georgianus) around South Georgia and Shag Rocks. Antarctic Science, 20 (4). 343-353. 10.1017/S0954102008000990

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Abstract/Summary

Pseudochaenichthys georgianus is a member of the unique Channichthyidae family of fishes, which lack haemoglobin. The distribution, length-frequency and summer diet are described from 14 bottom trawl surveys undertaken in the summers between 1986 and 2006. Pseudochaenichthys georgianus (50-590 mm TL) were caught throughout the South Georgia shelf from depths of 76-370 m, but very few specimens (< 1%) were caught on the Shag Rocks shelf. Multiple cohorts were present during each survey and length-frequency analysis of these cohorts suggests that growth is fast during the first 3-4 years. Stomach contents analysis (2005 & 2006) indicated that P. georgianus is a pelagic or semi pelagic predator, with the summer diet dominated by Antarctic krill (Euphausia superba). Fish (channichthyids and notothenids) were also taken, but were a relatively minor part of the diet.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1017/S0954102008000990
Programmes: BAS Programmes > Global Science in the Antarctic Context (2005-2009) > DISCOVERY 2010 - Integrating Southern Ocean Ecosystems into the Earth System
ISSN: 09541020
Additional Keywords: Fish; Channichthyidae;
NORA Subject Terms: Marine Sciences
Biology and Microbiology
Date made live: 04 Aug 2010 08:54
URI: http://nora.nerc.ac.uk/id/eprint/10209

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