Summary
The corpuscles of Stannius (CS) of the cichlid Oreochromis mossambicus (formerly Sarotherodon mossambicus) were studied in relation to sexual maturation and plasma calcium levels. After sexual maturation, the CS are enlarged in female fish, because of an increase in size and number of the type-1 cells. During the ovarian cycle, the size of the CS increases in parallel with the growth of the ovaries. Concurrently, plasma total calcium increases markedly until spawning. This increase is mainly accounted for by calcium bound to proteins (vitellogenins), but the ultrafiltrable calcium fraction is also slightly higher than in males. Ovariectomy is followed by a reduction in the size of the CS, mainly a result of involution of the type-1 cells, and by a reduction in plasma calcium to levels typical for males. Gonadectomy in males does not affect size or ultrastructure of the CS, or plasma calcium levels. Since the type-1 cells of the CS are the presumptive source of a hypocalcemic hormone, we conclude that activation of the CS during the female reproductive cycle is a response to elevated calcium levels that accompany ovarian maturation. We suggest that the CS respond in particular to the elevated ultrafiltrable or ionic calcium levels.
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Urasa, F.M., Bonga, S.E.W. Stannius corpuscles and plasma calcium levels during the reproductive cycle in the cichlid teleost fish, Oreochromis mossambicus . Cell Tissue Res. 241, 219–227 (1985). https://doi.org/10.1007/BF00214644
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DOI: https://doi.org/10.1007/BF00214644