Use of Fish Waste for the Production of Animal Nutritional Supplement Through the Acid Silage Process

Abstract

The use of fish waste to obtain by-products with added value is one of the appropriate ways to reduce waste generation. The acid silage process can be used to reuse these residues, as it is economically viable and easy to prepare. The present work aimed to standardize the acid silage process for the production of animal nutritional supplement from fish residues, and to compare the nutritional parameters with those described in the legislation, in scientific articles and on labels of sachets of commercial products. The results obtained for the nutritional parameters were satisfactory, corresponding to 1.70% (m/m) in gray matter; 0.06% (w/w) in calcium; 35.72% (w/w) crude protein; 1.63% (m/m) in crude fiber, except for the ether extract (50.31% m/m) and 31.00% moisture (m/m). The significant difference (≅ 25%) in the ether extract content and (≅ 16%) in relation to the moisture content is probably due to the type of raw material used. However, they are in accordance with the limits established by Brazilian legislation for supplements classified as semi-moist or moist. Depending on the characteristics, the product can be used to supplement animal feed.