[Free amino acids of hemolymph of marine isopods, Sphaeroma hookers Sphaeroma serratum (Flabellifera) and Idotea balthica (Valvifera)].

The total concentration of the free amino acids in the hemolymph is higher (about twice the amount in three species of marine Isopods (Sphaeroma hookeri, S. serratum and Idotea balthica) than in Decapods. In the three species so far studied, the proportions of glycine and taurine are always rather high.

[Free amino acids in sera of Cymothoidae (crustacean, isopods, parasites of fishes) and some teleosts].

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.

[Free amino acids of hemolymph during pubertal molting and senescence in Spaeroma serratum (Isopoda, Flabellifera].

In Sphaeroma serratum, the amino-acidemia is high (about 120 mg/100 ml) during the intermolt stages. The relative proportions of the different free amino acids show only slight differences in young males and senescent ones. At the time of the puberty molt, the total amino-acids concentration (including taurine) of the hemolymph increases sharply during premolt (up to 267 mg/100 ml), falls after ecdysis (down to 97 mg/100 ml and then rises up to the level of the intermolt stage.