Fine structure of the corpuscles of stannius of the trout, Salmo gairdneri: Structural changes in response to increased environmental salinity and calcium ions

摘要: Abstract These studies confirm that there are two cell types, C 1 and 2 , in the corpuscles of Stannius (CS) trout, Salmo gairdneri both which have appearance protein-or peptide-secreting cells. cells large secretory granules, up to 1.0 μm diameter, while small granules 0.5 μm. In seawater (SW)-adapted trout significantly larger than those freshwater (FW)-adapted trout. fresh water relatively inactive mainly sparsely granulated actively secreting. The converse situation is found seawater-adapted very active contain stored granules. During adaptation SW from FW some develop extensive rough endoplasmic reticulum Golgi but other degenerate disintegrate apparently releasing entire contents, including into capillary lumena. Protein may be released these capillaries by digestive enzymes lysosome-like vesicles. adapted appear release their exocytosis. fish transferred calcium-enriched similar dilute SW, suggesting respond high levels external calcium, media low ionic osmotic strength.