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• W2146265003 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 355:277-285 (2008) - DOI: https://doi.org/10.3354/meps07227 Non-lethal assessment of reproductive characteristics for management and conservation of sharks Cynthia A. Awruch1,5,*, Stewart D. Frusher2, Ned W. Pankhurst3, John D. Stevens4 1School of Aquaculture, University of Tasmania, Launceston, Tasmania 7250, Australia 2Marine Research Laboratories, Tasmanian Aquaculture and Fisheries Institute, University of Tasmania, Hobart, Tasmania 7053, Australia 3Griffith University, Science, Environment, Engineering and Technology Group, Gold Coast, Queensland 9726, Australia 4CSIRO, Marine and Atmospheric Research, Castray Esplanade, Hobart, Tasmania 7001, Australia 5Present address: Marine Research Laboratories, Tasmanian Aquaculture and Fisheries Institute, University of Tasmania, Hobart, Tasmania 7053, Australia *Email: cynthia.awruch@utas.edu.au ABSTRACT: Chondrichthyans are one of the most vulnerable groups of marine species, with increasing numbers being listed as endangered or threatened. Fundamental to the conservation and management of any animal is an understanding of their reproduction and particularly, the size at which individuals enter the reproductive population. Size at maturity in sharks is typically obtained by macroscopic examination of the gonads after sacrificing the fish. Using the draughtboard shark Cephaloscyllium laticeps as a case study, we found that equivalent information can be obtained non-destructively using steroid hormone levels measured from a blood sample. This technique allowed us to release the shark after only 1 to 2 min of handling. A combination of plasma steroid hormone concentrations and an external measurement (total length for females and clasper length for males) was used to determine that over 90% of female and 95% of male sharks were either juveniles or adults. The estimates of size at maturity from the hormone analysis were within 3% of equivalent values of dissected sharks. Once validated, hormone levels can also be used to determine seasonal reproductive patterns for the adult population. Our results demonstrated how measurement of plasma levels of steroid hormones can provide a non-destructive method for obtaining reproductive data necessary for managing vulnerable and endangered shark species. The development of a non-destructive sampling tool also allows for improved ethical investigation into this vulnerable group of marine fishes. KEY WORDS: Steroid hormones · Reproduction · Oviparous · Size at maturity · Cephaloscyllium laticeps · Draughtboard shark Full text in pdf format PreviousNextCite this article as: Awruch CA, Frusher SD, Pankhurst NW, Stevens JD (2008) Non-lethal assessment of reproductive characteristics for management and conservation of sharks. Mar Ecol Prog Ser 355:277-285. https://doi.org/10.3354/meps07227 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 355. Online publication date: February 26, 2008 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2008 Inter-Research." @default.
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