Size-dependent growth of individual Atlantic salmon Salmo salar alevins from hatch to first feeding

J. Gilbey, E. Cauwelier, C. S. Jones, A. Mclay, L. R. Noble, E. Verspoor

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Abstract

Variation in egg size, hatch timing and size at hatch, and their influence on individual growth rates of Atlantic salmon Salmo salar alevins up to first feeding were examined in pure strain and hybrid crosses of fish from Scotland and Canada. At the intra-female, intra-cross type and inter-cross type levels, specific growth rates prior to first feed were strongly size dependent, with smaller and later hatching alevins growing significantly faster. The magnitude of this size-dependent growth was greatest in the hybrid crosses. This resulted in a 40% reduction in the coefficient of variation (c.v.) in alevin size from post-hatch to first feeding at the intra-female level, and a reduction of both intra- and inter-cross differences in alevin sizes in the same period.
Original languageEnglish
Pages (from-to)2820-2831
Number of pages11
JournalJournal of Fish Biology
Volume75
Issue number10
DOIs
Publication statusPublished - Dec 2009

Keywords

  • egg size
  • hatch timing
  • specific growth rate
  • yolk sac

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