[Histochemical localization of lactate dehydrogenase in blastomeres during early development of the rainbow trout embryo (Salmo irideus Gibb)].

During the early development of the trout egg, some blastomers display a certain activity of the L.D.H., variable according to their position in the embryo. At the morula stage, the histochemical ltion of those blastomeres. On the contrary, during the gastrula stage, the blastomeres which have a high L.D.H. activity concentrate in the deep layer of the germ, in the "embryonic button", and in the germinal ring.