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Fish meal replacement studies

The composition of plant raw materials differs in particular from that of marine raw materials in terms of amino acids and fatty acids.

While fish oils are rich in omega-3 polyunsaturated fatty acids, vegetable oils mainly contain omega-6 polyunsaturated fatty acids and saturated fatty acids.  These differences may modify the metabolic processes involved in lipid storage.

However, INRA showed that the total replacement of fish oil by a mixture of vegetable oils had no effect on either growth or muscle lipid levels in the trout. However, feed containing the mixture of vegetable  oils caused a reduction in the levels of plasma cholesterol and circulating LDL (low density lipoprotein, transport proteins) and in the expression of the LDL receptor gene in the liver and adipose tissue.

A total replacement of fish oil by a mixture of vegetable oils is thus possible in the trout, although further studies are necessary to clarify the mechanisms responsible for the cholesterol-lowering effect of vegetable oils. 


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