Histophysiologie de l'axe hypophyso-corticosurrenalien chez le saumon de l'Atlantique (cycle en eau douce, vie thalassique et reproduction)

摘要: The corticotropic cells of the pituitary gland and interrenal (adrenocortical tissue) Atlantic salmon Salmo salar L. were studied at various stages life cycle in fresh water (Adour River) Ocean, near Greenland; cytological data completed by measurement cell surface nuclear area ACTH cells; diameter number nuclei on a constant determined interrenal. Results indicate that corticotrophic-interrenal axis is stimulated sedentary parr winter, during testicular maturation, compared with immature male female parrs. In spring, after slight reduction, activity this endocrine once again smoltification prior to catadromous migration. large (3–10 kg) caught North Greenland, feeding abundantly September, both tissues seem attain maximum activity. return freshwater March–April coincides slightly reduced which not clearly modified spawning ground (December) kelts (March–April) returning sea for second time 1 yr starvation. However these freshwater, functional heterogeneity more evident islets some degenerating processes may occur kelts. At last two stages, PAS positive cytoplasmic bodies are abundant possibly be correlated development gonads. These those published Pacific often show striking hypercorticism sexual maturation. significance adrenal hyperactivity discussed relation euryhalinity smolt, mainly gill level.