The Physiology of Developing Fish: Viviparity and by W.S. Hoar and D.J. Randall (Eds.)

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

FROM THE PREFACE: Dramatic adjustments ensue within the body structure of such a lot animals in the course of their improvement. one of the vertebrates, birds are completely oviparous, dwell for variable sessions in a cleidoic egg, and convey basic changes in excretion, food, and respiratory on the time of hatching. by contrast, the eutherian mammals are all viviparous, depend upon the maternal move and a really good placenta to supply nutrition, trade gases, and discharge wastes. The body structure of either mom and fetus is extremely really good in the course of gestation and alterations essentially on the time of delivery. Fishes exemplify either the oviparous and the viviparous modes of improvement, with a few examples which are intermediate among the 2. In those volumes, chosen experiences of many, yet now not all, facets of improvement are awarded. The chapters partially A relate to the body structure of eggs and larvae; these partly B obstacle viviparity and the body structure of posthatching juvenile fishes.

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In species with superfetation, only the oldest embryos were released from the follicle, implying a differential response on the part of the follicular tissue. In Gambusia, where gestation to term is intrafollicular, release of the embryos from the follicles into the ovarian lumen coincides with birth, that is, expulsion of the embryos from the ovarian lumen. Birth or parturition is accomplished by the initiation of contraction of the muscular walls of the ovary. Embryos are quiescent and do not have any mechanical role in follicular rupture or parturition.

Comephoridae (Baikal oilfishes) Order Perciformes 12. Embiotocidae (surfperches) 13. Clinidae (Suborder Blennioidei) (clinids) 14. Labrisomidae (Suborder Blennioidei) (labrisomids) I Systematic references to the groups listed here are given in Wourms (1981). We have adhered to his arrangement although alternative arrangements are also accepted. , Nelson, 1984) place the Zoarcidae (eelpouts) among the Perciformes. Moreover, the Family Parabrotulidae is not universally recognized; instead, some systematists (Nelson, 1984) include its members within the Zoarcidae.

This raises the question of immunological relationships. Finally, viviparity, as a reproductive strategy of frequent evolutionary occurrence, needs to be considered in terms of its ecological implications. 2. ENDOCRINE RELATIONSHIPS According to Amoroso et al. ” Hogarth (1976), nevertheless, thought it unlikely that any major endocrine innovations 14 JOHN P. WOURMS ET AL. occurred during the acquisition of viviparity. Instead, new tissue responses to preexisting categories of hormones evolved and new factors, such as embryonic influences, have been added to the regulation of basic hormonal interactions.

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