Reproduction and embryonic development of the blue stingray, Dasyatis chrysonota, in southern African waters

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Ebert, D. A., & Cowley, P. D. (2009). Reproduction and embryonic development of the blue stingray, Dasyatis chrysonota, in southern African waters. Journal of the Marine Biological Association of the United Kingdom, 89(4), 809-815. doi:10.1017/S0025315408002907
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TitleReproduction and embryonic development of the blue stingray, Dasyatis chrysonota, in southern African waters
AuthorsA. Ebert, D. Cowley
AbstractDasyatis chrysonota is perhaps the most common of the 14 whiptail stingray (Chondrichthyes: Dasyatidae) species known to frequent the temperate coastal waters of southern Africa and like other stingrays they possess life history characteristics that make them vulnerable to over-exploitation. First and 50% maturity (Dw50) were determined for 153 males and 204 females from the Eastern Cape Province of South Africa. Disc width (Dw) for first and Dw50 maturity was estimated at 392mm and 395mm Dw, respectively for males and at 500mm and 505mm Dw, respectively for females. The reproductive cycle of males, based on gonadosomatic (GSI) and hepatosomoatic (HSI) indices indicates that they are most active during the spring. Females appear to have an annual reproductive cycle with a maximum HSI occurring during the summer and autumn, but it declines steadily through the birthing season reaching a low in the late spring. Fecundity, following a nine month gestation period, averages 2.8 with a range of 17. Embryos at six different development stages are described. Dasyatis chrysonota, like other dasyatids, exhibit life history characteristics that make them vulnerable to overexploitation, therefore a precautionary management strategy is advised for this species. © 2009 Marine Biological Association of the United Kingdom.
JournalJournal of the Marine Biological Association of the United Kingdom
Date2009
Volume89
Issue4
Start page809
End page815
ISSN00253154
Subjectsbreeding season, coastal water, embryonic development, exploitation, fecundity, fish, life history, pregnancy, reproduction, reproductive cycle, sexual maturity, Africa, Eastern Cape, South Africa, Southern Africa, Sub-Saharan Africa, Chondrichthyes, Dasyatidae, Dasyatis chrysonota, Dasyatis pastinaca, Teiidae
NoteCited By (since 1996):4, CODEN: JMBAA

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