Binders in fish feeds

Abstract

Alginate and guar gum were fed in different concentrations in dry, moist and wet diets to rainbow trout (Salmo gairdneri, Richardson). Both binders reduced the apparent digestibility of protein and fat. They also reduced the feed intake and increased the moisture content of the faeces. Guar gum caused a delayed rate of passage through the gastro-intestinal tract. High levels of guar gum reduced the growth and the dry matter and fat contents of the fish. The protein content, $\text{Ca}\text{P}$-ratio of the bones, condition factor, viscera and liver weights, and mortality were not influenced by the binders.