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Title: Fishery
Issue Date: Jun-2005
Publisher: CSIR
Abstract: The experimental use of fish silage as an alternative protein ingredient in aquafeeds has been widely reported. Feeding, digestibility and growth studies on warm water species including the Indian carp (Cirrhinus mrigala), tilapia (Oreochromis niloticus and O. aureus) and pacu (Piriactus mesapotamicus), have shown fish silage to be highly digestible and an effective replacement for up to 75% of fish meal in aquafeeds. Fish silage is prepared by combining minced fish or parts of fish with acid or lactic acid bacteria derived from fermentable carbohydrate substrates. At low pH the fish is liquefied through the action of digestive tract, proteolytic enzymes. The breakdown is accelerated by the acids, which in addition to reducing the pH also break down bones and cartilage and prevent the growth of spoilage bacteria. Liquid fish silage may be combined directly into moist diets, or condensed or dried for use as an animal feed ingredient. However, conventional methods of drying, using energy derived from fossil fuels, are generally too expensive and fish silage is usually manufactured and stored as a liquid, close to point of use. The limited use of fish silage in tropical aquaculture is surprising given its potential effectiveness as a method for the utilization of otherwise wasted fishery products. Fish silage can be manufactured using simple technologies on small amounts of raw materials in isolated areas or on-board fishing vessels. This limited use of silage in the tropics may result from failure to optimize methods of manufacture, use of spoiled raw materials or poor storage conditions.
Description: 211
ISSN: 0975-1092 (Online); 0972-592X (Print)
Appears in Collections:NPR Vol.4(3) [May-June 2005]

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