4.1.3. Presence of other bioactive compounds in fish hydrolysates The lipid quantitative content was not identified as a relevant marker to predict the antiproliferative activity. For example, the lipid content of all blue whiting hydrolysates was quantitatively equivalent but the antiproliferative activity of Blue whiting 3–5 wasmuchgreaterthanthatofBluewhiting1and2.Thisanalysis does not exclude that the presence of peculiar bioactive lipids in hydrolysates, as well as trace elements of minerals or other bioactive compounds such as fin chondroitine sulfate, or