Review: Use of Animal Fats in Aquaculture Feeds
Resumen
Formulated aquaculture feeds are among the most expensive animal feeds on the market.
These feeds are often high in lipids, the bulk of which is generally provided by fish oil.
Because of its high cost and potential long-term supply problems, it is now widely
acknowledged that fish oil should be used more sparingly in aquafeeds. Rendered animal
fats are economical lipid sources that have been used in fish feeds for decades but their use
has been greatly limited for various reasons, such as poor digestibility and nutritive value,
and more recently, fear of disease transmission. Recent studies have indicated that rendered
animal fats can be valuable ingredients in fish feeds. Incorporation levels equal to 30-40%
of total lipid of the diet do not impose any negative effects on growth performance, feed
efficiency, and product quality of most fish species studied. However, the diet must contain
sufficient levels of unsaturated fatty acids (mono and polyunsaturated) to allow for proper
digestibility of saturated fatty acids, and, obviously, meet essential fatty acid requirements
of the fish. The use of rendered animal fats at the expenses of fish oil in aquafeeds could
immediately result in significant savings for feed manufacturers.
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