Abstract
The icefish Cryodraco antarcticus is common in deeper waters of the southern Scotia Arc and the high-Antarctic zone. A number of biological features of this species are presented, with new information collected from recent scientific surveys of the South Shetland Islands and South Orkney Islands. The species is closely related to Chaenocephalus aceratus, but can be distinguished by a number of meristic characters. The two species are similar in size, colouration and body shape, and have a number of aspects of their life-cycle in common, such as reproduction, length-weight relationship and diet. These two species appear to occupy a very similar niche in the southern Scotia Arc ecosystem. However, Cryodraco antarcticus is less abundant and uses different spatial components of shelf areas, replacing Chaenocephalus aceratus in deeper water and high-Antarctic regions.
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