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Indian Journal of Natural Products and Resources (IJNPR)
[Formerly Natural Product Radiance (NPR)] >
NPR Vol.4 [2005] >
NPR Vol.4(3) [May-June 2005] >
| 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. |
| Page(s): | 211 |
| ISSN: | 0975-1092 (Online); 0972-592X (Print) |
| Source: | NPR Vol.4(3) [May-June 2005]
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