Reproduction of the temperate aspidochirote Stichopus mollis (Echinodermata: Holothuroidea) in New Zealand

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Show simple item record Sewell, Mary en 2015-01-18T23:08:45Z en 1992-05 en
dc.identifier.citation Ophelia, 1992, 35 (2), pp. 103 - 121 en
dc.identifier.issn 0078-5326 en
dc.identifier.uri en
dc.description.abstract Reproduction of the holothurian Stichopus mollis from the north-east coast of New Zealand was investigated through histological examination of the gonads. Changes in the gametogenic condition of the gonads are documented by the maturity index and oocyte size-frequency methods. The ovary or testis is located in the anterior coelom, and consists of two bilaterally symmetrical tufts of gonad tubules. S. mollis has an annual reproductive cycle, spawning in the austral summer. Males and females show synchronous development. Growth of the gonads begins in early spring, and involves the regrowth of the gonad basis, with subsequent branching and lengthening of the gonad tubules. In female sea cucumbers, oocytes develop from 5 µm to a maximum of 180 µm. Growth is characterised by the formation of larger oocytes surrounded by folJicular epithelium in the centre of the tubules, with a ring of smaller oocytes along the tubule wall. The testis retains a large spermatocyte layer throughout most of gonad growth. Few gonads were found to contain large numbers of spermatozoa. After spawning, the gonad tubules and basis are completely resorbed in both sexes so that no gonad tissue exists for 5–6 months. Observations from the South Island suggest that individuals do not undergo complete resorption, but maintain a resting phase gonad during the winter. Stichopus mollis, therefore, shows a different reproductive pattern with respect to latitude. Although the “tubule recruitment model” of Smiley (1988) may be representative of gonadal growth in S. mollis in southern New Zealand, in the warmer waters of north-east New Zealand the gonad is completely resorbed and the progressive recruitment of tubules cannot occur. These results emphasise the importance of location in studying reproduction in widely distributed holothurian species. en
dc.publisher Taylor & Francis en
dc.relation.ispartofseries Ophelia en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from en
dc.rights.uri en
dc.title Reproduction of the temperate aspidochirote Stichopus mollis (Echinodermata: Holothuroidea) in New Zealand en
dc.type Journal Article en
dc.identifier.doi 10.1080/00785326.1992.10429973 en
pubs.issue 2 en
pubs.begin-page 103 en
pubs.volume 35 en
pubs.end-page 121 en
dc.rights.accessrights en
pubs.subtype Article en
pubs.elements-id 146792 en Science en Biological Sciences en
pubs.record-created-at-source-date 2015-01-19 en

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