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Moulting interval and growth of juvenile Antarctic krill (Euphausia superba) fed different concentrations of the diatom Phaeodactylum tricornutum in the laboratory
Authors:T. Ikeda  P. G. Thomas
Affiliation:(1) Antarctic Division, Department of Science, Channel Highway, 7150 Kingston, Tasmania, Australia;(2) Present address: Japan-Sea Regional Fisheries Research Laboratory, 1 Suido-cho, 951 Niigata, Japan
Abstract:Summary Juvenile Antarctic krill (Euphausia superba) were fed the diatom Phaeodactylum tricornutum at concentrations ranging from 0.0–5.0 mgCl-1. Intermoult period (IP) decreased, but an increment of body length per moult (DeltaBL) of juvenile krill increased, up to a concentration of 1.0 mgCl-1. No further effect of food concentrations on IP or DeltaBL was seen at concentration beyond 1.0 mgCl-1. IP plateaued at 23.8 days and DeltaBL, 1.14 mm. The maximum daily growth rate (DeltaBL/IP) of juvenile krill was calculated to be 0.047 mm day-1. DeltaBL and IP were correlated and the relationship is expressed as DeltaBL=-0.0066IP+2.47 (r=0.58, n=141, P<0.01). Growth conditions of krill in the Southern Ocean are discussed in terms of available food concentration in there.
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