Abstract
The effect of increased dietary salt on growth and nutrition of rainbow trout was investigated using two types of salt-enriched diets: (a) commercial trout food reconstituted to contain 4.5%, 9.2% and 11.6% NaCl, (b) isonitrogenous and isocaloric diets containing similar salt levels, i.e. no nutrient dilution caused by salt addition. Food conversion efficiency of fish fed the isonitrogeous diets was not affected by the added salt, but both conversion efficiency and growth rate were adversely influenced by the salt-supplemented commercial food. The insignificant differences in protein efficiency ratio among fish fed on different levels of salt indicates that reduction in food conversion efficiency is probably the result of protein dilution rather than the added salt. Food intake and appetite were not affected by dietary salt, and feeding to satiation enhanced growth in all feeding treatments, but this feeding regime did not alter the differences in growth rate between normally fed fish and those fed on salty diets.
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