| Quantification of the maternal-embryonal nutritional relationship of elasmobranchs: case study of wobbegong sharks (genus Orectolobus). | |
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MedLine Citation:
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PMID: 21539548 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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The present study used wobbegong sharks (genus Orectolobus) to assess the threshold value proposed by previous research to categorize strict lecithotrophic from incipient histotrophic species. Totals of 236 and 135 ornate wobbegong Orectolobus ornatus and spotted wobbegong Orectolobus maculatus, respectively, were collected from the New South Wales commercial fishery between June 2003 and May 2006. Eight pregnant gulf wobbegong Orectolobus halei were also recorded outside the sampling period for the first time. The three species were reproductively synchronous with a gestation of c. 10-11 months. Embryos started to be macroscopically visible during January and external yolk sacs were fully absorbed by June to July when embryos were c. 200 mm total length (L(T) ). Internal yolk sacs were first observed during April to May when embryos were c. 160 mm L(T) , reached a peak during June and persisted in embryos immediately prior to parturition. The total wet mass from uterine egg to full-term embryos increased by 44-89% and 45-62%, whereas the total organic mass decreased by 32-33% and 26%, for O. ornatus and O. maculatus, respectively, suggesting that these species are strict lecithotrophic yolk-sac viviparous sharks with no maternal nutrient input. A review of the literature identified various issues and suggested that the previously proposed organic mass loss threshold value separating strict lecithotrophic species from incipient histotrophic species might not be appropriate. Instead, it is recommended that a combination of methods (e.g. estimation of organic mass gain or loss between ovarian egg and developed embryo, histology and electron microscopy of the uterus, radio-tracer assay and uterine fluid analysis throughout gestation) is used to discern between strict lecithotrophic and incipient histotrophic species. |
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Authors:
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C Huveneers; N M Otway; R G Harcourt; M Ellis |
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Publication Detail:
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Type: Journal Article Date: 2011-04-06 |
Journal Detail:
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Title: Journal of fish biology Volume: 78 ISSN: 1095-8649 ISO Abbreviation: J. Fish Biol. Publication Date: 2011 May |
Date Detail:
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Created Date: 2011-05-04 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0214055 Medline TA: J Fish Biol Country: England |
Other Details:
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Languages: eng Pagination: 1375-89 Citation Subset: IM |
Copyright Information:
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© 2011 The Authors. Journal of Fish Biology © 2011 The Fisheries Society of the British Isles. |
Affiliation:
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Threatened Endangered and Protected Species subprogram, SARDI-Aquatic Sciences, 2 Hamra Avenue, Adelaide, South Australia 5165, Australia School of Biological Sciences, Flinders University, Sturt Road, Adelaide, South Australia 5043, Australia Graduate School of the Environment, Macquarie University, Sydney, New South Wales 2109, Australia Industry and Investment NSW, Port Stephens Fisheries Institute, Taylors Beach Road, Taylors Beach, New South Wales 2316, Australia. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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