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Abstract

A digestibility trial was conducted to examine the effect of feeding rate on dry matter, gross energy, crude protein and phosphorus digestibility in Atlantic salmon
(Salmo salar). Duplicate groups of fish were fed 0.25, 0.5, 0.75, 1.0, 1.25 and 1.9% BW/day. The faeces were collected by Guelph-type collectors for five successive days. Dry matter, protein and phosphorus digestibilities were all significantly (P<0.05) affected by feeding rate. Dry matter digestibility was significantly lower in fish fed 0.25% BW day in comparison with fish fed 0.5, 0.75 and 1% BW day. Protein digestibility was significantly lower in fish fed 0.25% BW/day in comparison with
1.25% BW day. Phosphorus digestibility was significantly lower in fish fed 0.25%
BW/day in comparison with all other treatments except for 1% BW day. There were no
significant differences for energy digestibility between fish fed with different amount of
feed. The main effect was reduced digestibility at the lowest level of intake with no
obvious relationship between feeding rate and digestibility above this amount. This was
explained by a relatively higher loss of endogenous faecal nitrogen and phosphorus at
sub-maintenance feeding.

Item Type:	Article
Authors/Creators:	Sajjadi, M and Carter, CG
Keywords:	Atlantic salmon, Phosphorus digestibility, Feeding rate, Apparent digestibility.
Journal or Publication Title:	Iranian Journal of Fisheries Sciences
ISSN:	1562-2916
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