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

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

ISBN-10: 008058523X

ISBN-13: 9780080585239

ISBN-10: 0123504031

ISBN-13: 9780123504036

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Example text

On the contrary, the hypophysectomized animals remained immature in appearance while gonadal development was completely arrested in the females and markedly delayed in the males. Larsen (1965,1969) finds continued relatively slow growth of the ovaries after hypophysectomy but confirms Dodd's findings in the male. The effects on the gonads are particularly interesting. In the gnathostomes, hypophysectomy is followed not only by an arrest of ovarian development but also by a general atresia of the follicles (corpora lutea formation) while spermatogenesis is completely blocked in the testis.

0- H-P Both follicular and ovarian gestation are characterized by ovoviviparous and viviparous types of development. As in the elasmobranchs, the total dry weight of the larva at birth may be less than that of the egg, indicating the complete lack of a maternal contribution to the nourishment of the embryo while in the more specialized viviparous types the egg is endowed with very little yolk and the developing embryo obtains almost all of its nourishment from its parent (Fig.

On the contrary, the hypophysectomized animals remained immature in appearance while gonadal development was completely arrested in the females and markedly delayed in the males. Larsen (1965,1969) finds continued relatively slow growth of the ovaries after hypophysectomy but confirms Dodd's findings in the male. The effects on the gonads are particularly interesting. In the gnathostomes, hypophysectomy is followed not only by an arrest of ovarian development but also by a general atresia of the follicles (corpora lutea formation) while spermatogenesis is completely blocked in the testis.

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


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