The free amino-acid composition of the sera of 4 species of Isopods Cymothoidae (Meinertia oestroides, Meinertia parallela, Emetha audouini, Anilocra physodes) are very similar, and present the same characteristics, both quantitatively and qualitatively, as those of free marine Isopods of the family Sphaeromatidae and Idoteidae. Five amino acids are preponderant (serin, prolin, glycin, alanin and taurin). The total concentration is relatively high (154.6-356.4 mg/100 ml) with respect to Decapods. In the parasites studied so far, the free amino-acid pattern (except prolin) is rather like that of the Teleost Fishes, whether they are potential hosts of Cymothoidae or not. The free amino-acid concentration of the blood of the Fishes does not seem to be impaired by the Cymothoidae parasitism.
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