Reproductive biology of catsharks (Chondrichthyes: Scyliorhinidae) off the west coast of southern Africa

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Ebert, D. A., Compagno, L. J. V., & Cowley, P. D. (2006). Reproductive biology of catsharks (Chondrichthyes: Scyliorhinidae) off the west coast of southern Africa. ICES Journal of Marine Science, 63(6), 1053-1065. doi:10.1016/j.icesjms.2006.04.016
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TitleReproductive biology of catsharks (Chondrichthyes: Scyliorhinidae) off the west coast of southern Africa
AuthorsA. Ebert, V. Compagno, D. Cowley
AbstractThis study presents information on the reproductive biology of five southern African catshark species: Apristurus microps, A. saldanha, Apristurus sp., Galeus polli, and Scyliorhinus capensis. They were caught between Walvis Bay, Namibia, and Cape Agulhas, South Africa, from 50 to 1016 m deep. The reproductive mode of four species was oviparous, whereas G. polli exhibited aplacental viviparity. Males of all species attained first maturity slightly larger than females, and males of the four oviparous species attained a larger LTmax than females. The length at 50% maturity was similar for males and females in most species. All species matured at an LT > 75% of LTmax except for male Apristurus spp. and female G. polli, which matured at 71.2% and 68.8%, respectively, of LTmax. The egg case of A. microps has minute tendrils, whereas those of S. capensis were quite long, suggesting different egg-laying habitats. Fecundity in G. polli ranged from 5 to 13, and litter size increased in relation to increased female length. Embryos of G. polli were large, each measuring approximately 30% of female LT. Neonates of G. polli were common and appear to have a demersal lifestyle; those of the four oviparous species were entirely absent from the study. Gravid A. microps were found in summer and winter, indicating a protracted breeding cycle, but reproductively active S. capensis were caught only in winter. Prior to this study, reproductive information on these catsharks was largely lacking. © 2006 International Council for the Exploration of the Sea.
JournalICES Journal of Marine Science
Date2006
Volume63
Issue6
Start page1053
End page1065
ISSN10543139
Subjectsembryonic development, fecundity, maturation, oviparity, reproductive biology, shark, viviparity, Africa, Cape Agulhas, Erongo, Namibia, South Africa, Southern Africa, Sub-Saharan Africa, Walvis Bay, Western Cape, Apristurus, Apristurus microps, Apristurus saldanha, Chondrichthyes, Galeus polli, Poroderma africanum, Scyliorhinidae, Scyliorhinus capensis
NoteCited By (since 1996):23, CODEN: ICESE

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