Algael protein both directly harvested from ocean and cultivated are the least cost and similar quality to fish meal. It can even replace the fish meal completely.
Very good to develop alternative sources of protein in aquafeeds. Can I have the full paper so as to make a more informed comment?
Fish meal addition in the feed formulation improves attractability apart from nutritionl point of view. Partial replacement may be possible if it is acceptable for farmers. I have formulated and produced balanced aminoacid feed by partial replacement of fish meal, due to less fish aroma it is not acceptable to aquacultuarists. It needs practical study and extension work