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Reproductive development and plasma levels of reproductive hormones of goldeye hiodon alosoides rafinesque taken from the north saskatchewan river canada during the open water season



Reproductive development and plasma levels of reproductive hormones of goldeye hiodon alosoides rafinesque taken from the north saskatchewan river canada during the open water season



Canadian Journal of Zoology 64(12): 2843-2849



Changes in gonadal condition and plasma levels of gonadotropin and sex steroids were measured in goldeye (Hiodon alosoides) captured from the North Saskatchewan River, Edmonton, Alberta [Canada], from May to October in both 1983 and 1984. Mature females and spermiated males were captured in May and June and spent fish were captured in June. Gonadal recrudescence occurred over the summer and by October, relative gonad weights had reached 70% (females) and 90% (males) of the prespawning maxima. In females, plasma calcium was significantly elevated in spent fish in June, and in August there was a decrease in liver weight. Plasma levels of gonadotropin were highest in females during June, and in males during May. 17.alpha.,20.beta.-Dihydroxy-4-pregnen-3-one was elevated in preovulatory or spent females and prespawning males, then decreased throughout the summer, whereas testosterone was only detectable in the plasma of prespawning fish. Estradiol-17.beta. and estrone were not detectable in the plasma of females at any stage, including the period of vitellogenesis.

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Accession: 006316741

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