Abstract
Two types of cells (type 1 with large granules and type 2 with small granules) are present in the corpuscles of Stannius of the coho salmon, Oncorhynchus kisutch, during smoltification. The cells increase in size during normal smoltification and are equally large in freshwater and seawater smolts; in abnormal stunted fish in seawater the mean cell size is similar to that characteristic of parr. Nevertheless, the predominant type 1 cells (as well as the less frequent type 2 cells) in stunts appear active and are relatively depleted of granules. Type 1 cells may be associated with hypocalcin secretion; release of this hormone may be greater in stunts than in normal seawater smolts, possibly owing to initial difficulty of these incompletely smoltified fish to adjust to the seawater environment.
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