Moulting interval and growth of juvenile Antarctic krill (Euphausia superba) fed different concentrations of the diatom Phaeodactylum tricornutum in the laboratory
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- Ikeda, T. & Thomas, P.G. Polar Biol (1987) 7: 339. doi:10.1007/BF00293224
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 (ΔBL) of juvenile krill increased, up to a concentration of 1.0 mgCl-1. No further effect of food concentrations on IP or ΔBL was seen at concentration beyond 1.0 mgCl-1. IP plateaued at 23.8 days and ΔBL, 1.14 mm. The maximum daily growth rate (ΔBL/IP) of juvenile krill was calculated to be 0.047 mm day-1. ΔBL and IP were correlated and the relationship is expressed as ΔBL=-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.