The reproduction and development of sharks, skates, rays and ratfishes: introduction, history, overview, and future prospects

ReferencesThis volume had its origin in aSymposium on the Reproduction and Development of Cartilaginous Fishes that was held at the annual meetings of the American Elasmobranch Society and the American Society of Ichthyologists and Herpetologists in Charleston, South Carolina in June 1990. The aim of this symposium was to bring together many of those scientists interested in chondrichthyan reproduction and development in order to assess the current state of knowledge in these fields.The chondrichthyan fishes occupy a pivotal position in comparative and evolutionary studies of vertebrate reproduction and development. They are the oldest surviving group of jawed vertebrates and they possess both the adult vertebrate Bauplan and the vertebrate program of embryonic development. The major features of the female reproductive system, including its embryonic origin, structure, physiological function, and biochemistry, apparently were established early in vertebrate evolution and are fully developed in chondrichthyan fishes. These features of the female reproductive system have been retained during the evolution of the other classes of vertebrates. Much the same can be said for the male reproductive system. Moreover, viviparity, placental nourishment of developing embryos, and the hormonal regulation of these events made an initial appearance in this group.The twenty-two articles contained in this volume bring together a wide variety of complementary research by investigators from seven countries. It is hoped that presentation of this disparate body of research and thought in one place will provide perspective on current research activity, call attention to those areas in which the research endeavour is deficient, and identify opportunities for future study. The appearance at this time of a volume on the reproduction and development of cartilaginous fishes is quite opportune. The continued existence of these fishes, which survived the great extinction events of Earth"s history, is now threatened by over-exploitation unless immediate steps for their conservation are undertaken. Knowledge of their reproduction and development not only is an end in itself, but is of critical importance in devising successful conservation and resource management strategies.

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