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The reproductive biology of Diplodus sargus capensis and D. cervinus hottentotus (Sparidae) off the south-east Cape coast, South Africa

Citation

Mann, BQ and Buxton, CD, The reproductive biology of Diplodus sargus capensis and D. cervinus hottentotus (Sparidae) off the south-east Cape coast, South Africa, Cybium, 22, (1) pp. 31 - 47. ISSN 0399-0974 (1998) [Refereed Article]

Abstract

An investigation of the reproductive biology of Diplodus sargus capensis and D. cervinus hottentotus was undertaken in the Tsitsikamma National Park, South Africa. Gonado-somatic indices showed that both Diplodus species had protracted spawning seasons extending from early spring into summer. The adult sex ratio of D. s. capensis was significantly dominated by females while that of D. c. hottentotus showed no significant difference from a 1:1 sex ratio. Size at 50% maturity was calculated at 211 mm FL and 280 mm FL for D. s. capensis and D. c. hottentotus respectively. This corresponded to an age of three and six years respectively. A detailed histological examination of gonad development revealed that D. s. capensis is a digynous hermaphrodite with partial protandry occurring in some of the male population. D. c. hottentotus is shown to be a rudimentary hermaphrodite. Group spawning behaviour in both species is postulated, based on various morphological and indirect behavioural characteristics.

Item Details

Item Type:Refereed Article
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Fisheries Sciences not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Environmental Sciences
Author:Buxton, CD (Professor Colin Buxton)
ID Code:49230
Year Published:1998
Web of Science® Times Cited:35
Deposited By:TAFI - Marine Research Laboratory
Deposited On:2007-08-01
Last Modified:2007-11-21
Downloads:0

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