Samples of Antarctic krill, Euphausia superba, were collected during the Discovery 2010 cruise aboard the James Clark Ross (JR177). Krill from two areas were used, one from around 60 South from the vicinity of the South Orkney Islands, and the second from north-west of South Georgia at around 52 South. All of the krill were taken by target fishing.
Discovery 2010, Euphausia, South Atlantic, Southern Ocean, circadian rhythm, clock genes, krill
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