The nitrogenous extractives from fresh fish muscle. III. -Comparison of several flat fishes and members of the herring-mackerel group

The fractionation by displacement chromatography on ion‐exchange resins of the aqueous‐alcoholic extracts of the muscle of six species of flat fish, as well as four members of the pelagic group, has shown the presence of a variety of amino‐acids in addition to creatine, creatinine and trimethylamine oxide, which are common to all. On the whole, the diagrams for the flat fishes are rather similar to those previously recorded for the gadoids. The pelagic species differ from both these groups by the presence of large amounts of histidine and by the absence of carnosine, anserine and the latter's constituent amino‐acids, methylhistidine and β‐alanine.