For the past several years, one of the main directions in improving fish feeds has been the search for protein source
alternatives to fish meal and determining their nutritional suitability in diets [4].This trend is, firstly, a response to
growing demands for formulated diets, and secondly, a response to limited resources of fish meal that will soon hit
the upper threshold of exploitation. Additionally, according to Hardy R.W. 2008 [5] one of methods to develop less
expensive and effective formulations is lowering fish meal levels in diets. The total replacement of fish meal with
soybean protein was successful only in a few cases [6, 7].