Fish silage was produced by the addition of formic acid to minced tilapia fish (Oreochromis niloticus) waste biomass. The aim was to evaluate the potential incorporation of formic acid fish silage as the main source of protein for the diet of cultivated fish Results showed that formic acid silage has good storage properties. The formic acid silage was able to provide similar values of energy content (approximately 483 Kcal per 100 g of dry silage) to those provided by fishmeal, which is the commercial product generally employed as the main source of protein in feed formulations. In addition, the ensiling process does not require heat processing, which is a characteristic of the production of fishmeal. Based on the good nutrient content and amino acid composition of the fish silage produced, it could be successfully employed as an alternative protein source for fishmeal in feed production. In this way, it is possible to utilize processing wastes for producing valuable animal protein and, furthermore, avoid the pollution problems associated with the discard of fish wastes into the environment.
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