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    A comparison of the annual changes in testicular activity and serum androgen levels between the early and delayed maturing groups of male Cottus hangiongensis

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    Date
    1992
    Author
    Quinitio, Gerald F.
    Goto, Akira
    Takahashi, Hiroya
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    1,046
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    Abstract
    Annual changes in testicular activity and concentration of two serum androgens were monitored in two groups of the river-sculpin Cottus hangiongensis collected from the upper and lower reaches of a river at southern Hokkaido, Japan. One of them (early maturing group) underwent testicular maturation with aberrant spermatids and spermatid masses produced during the reproductive cycle. Moreover, regular seasonal changes in serum testosterone and 11-ketotestosterone concentrations were observed. On the other hand, in the other group (delayed maturing group), although body size of the fish was large enough to undergo reproduction, annual changes in gonadosomatic index and testicular activity did not vary much. During the months of active testicular development in the early maturing group, spermatogenesis was observed to begin in some regions of the testes of delayed maturing fish, but always resulted in the formation of aberrant spermatids and spermatid masses. Moreover, concentration of serum androgens did not significantly vary throughout the year. Results suggest that low androgen production is a proximal factor for delayed sexual maturity in the delayed maturing group, and that the occurrence of aberrant spermatids and spermatid masses during spermatogenesis is not linked to the delayed maturity.
    URI
    http://hdl.handle.net/10862/1392
    Suggested Citation
    Quinitio, G. F., Goto, A., & Takahashi, H. (1992). A comparison of the annual changes in testicular activity and serum androgen levels between the early and delayed maturing groups of male Cottus hangiongensis. Environmental Biology of Fishes, 34(2), 119-126.
    DOI
    10.1007/BF00002387
    Type
    Article
    ISSN
    0378-1909
    Subject
    Animal reproductive organs; Annual variations; Freshwater fish; Males; Sex hormones; Sexual maturity; Testes; Cottus hangiongensis; Japan
    Collections
    • Journal Articles [1108]


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