Gonadal Morphology of Normal and Sex-Reversed Triploid and Gynogenetic Diploid Coho Salmon (Oncorhynchus kisutch)
- Piferrer, Francesc
- Benfey, T.J.
- Donaldson, Edward M.
DOIAbstract
13 pagesIn this study, the gonadal morphology of untreated and sex-reversed juvenile triploid and gynogenetic diploid coho salmon was compared with that of diploids. Testes of triploids were of the same size as those of diploids. Spermatogonia, however, were significantly bigger than those of diptoids in both diameter (P<0·001) and volume (P<0·01), suggesting that this characteristic can be a useful indicator of ploidy in the early stages of gonadal development. In females, induction of triploidy did not affect the lamellar structure of the ovaries but reduced their size considerably. Further, these ovaries had no oocytes. Treatment of triploids with oestrogen resulted in the feminization of genotypic males, which had ovaries similar to tho...
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