Aspects of the reproductive biology of skates (Chondrichthyes: Rajiformes: Rajoidei) from southern Africa

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Ebert, D. A., Compagno, L. J. V., & Cowley, P. D. (2008). Aspects of the reproductive biology of skates (Chondrichthyes: Rajiformes: Rajoidei) from southern Africa. ICES Journal of Marine Science, 65(1), 81-102. doi:10.1093/icesjms/fsm169
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TitleAspects of the reproductive biology of skates (Chondrichthyes: Rajiformes: Rajoidei) from southern Africa
AuthorsD. Ebert, L. Compagno, P. Cowley
AbstractNew information is presented on the reproductive biology of 22 southern African skate species. Sex ratios for most species were relatively even. Sexual dimorphic differences in disc shape were evident in all species, but the total length (LT) to disc width (D) relationship was significantly different in only three species, and the LT to weight (W) relationship significant in just five species. Sexual dimorphism relative to maximum total length (LTmax) was absent in all but the two largest species. Males and females of the same species grow to a similar L Tmax except those whose LTmax is >1.5 m LT. Size at first and 50% (LT50) sexual maturity was approximately the same for both sexes in all but the two largest species. First maturity occurred at >60% of LTmax for all species for which sufficient data were available, and most (n = 18) matured at >75% LTmax. The large size at maturity relative to LTmax suggests that growth slows or is partially suspended following sexual maturity. The egg cases of 15 species are described, and a key to their identification is presented. Egg cases in utero were observed throughout the year suggesting that most species reproduce year-round. © 2007 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved.
JournalICES Journal of Marine Science
Date2008
Volume65
Issue1
Start page81
End page102
ISSN1054-3139
Subjectsoviparity, reproductive biology, sex ratio, sexual dimorphism, sexual maturity, teleost, Africa, South Africa, Southern Africa, Sub-Saharan Africa, Chondrichthyes, Rajiformes, Rajoidei
NoteCited By (since 1996):20m, Fish and Fisheries, CODEN: ICESE

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