Reproduction and Growth Bioluminescence, Pigments, and by W.S. Hoar and D.J. Randall (Eds.)

By W.S. Hoar and D.J. Randall (Eds.)

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Extra info for Reproduction and Growth Bioluminescence, Pigments, and Poisons

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REPRODUCTION 43 more responsive than others; the substance has been particularly effective in regulating the farrowing of pigs. In spite of the variations in response, all species of fish studied show clear evidence of the blocking of gonadotropic action in a manner comparable to that which follows surgical hypophysectomy. Spermatogenesis is either completely suspended or greatly depressed; yolk deposition ceases, and, in the more responsive species, steroidogenesis comes to an end. The side effects of the compound appear to be minimal involving a slight stimulation of the pituitary thyrotrophs (because of a mild thiourea action) and some depression of the somatotrophs (Wiebe, 1967; Leatherland and Pandey, 1969) .

13). Turner applies the term “follicular pseudo-placenta” to this complex of follicular wall, follicular space, and the portal system of the belly sac. 38 WILLIAM S. HOAR Fig. 13. The embryonic-maternal connections in several poeciliids. 5-mm embryo of Lebistes (=Poecilia) reticuhtus, ( B ) Poeciliopsis embryo showing the portal network of the belly sac (pericardial sac anteriorly and expanded coelom posteriorly), ( C ) low branched villi on the internal surface of the follicle of Poeciliopsis, and ( D ) section of follicle and adjacent Poeciliopsis embryo.

Only the pituitary gonadotropic hormones and the gonadal steroids are considered in this chapter. Chapters associated with the other endocrine glands contain pertinent references to their role in reproduction; the endocrinology of reproductive behavior is considered separately in the chapter by Liley, this volume, The literature on fish endocrinology has been reviewed several times during the past decade (Pickford and Atz, 1957; Vivien, 1958; Bern and Nandi, 1964; Hoar, 1966; Matty, 1966), while the reproductive hormones of fishes have been separately considered by Dodd (1960a) and Hoar (1965a).

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