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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Life-history changes in exploited reef fishes on the east coast of South Africa
Environmental Biology of Fishes, Volume 36, No. 1, Year 1993
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Description
The impact of exploitation on various life-history characteristics of two sex changing, reef-dwelling sparid species was examined by comparing populations protected in a large marine reserve with those adjacent to the reserve. Like other sparids, Chrysoblephus laticeps and C. cristiceps grow slowly and are long lived, reaching ages of 17 and 21 years, respectively. No significant differences in the growth rate of C. laticeps were measured, but growth in C. cristiceps was significantly slower in the exploited population. Observed data showed that sex ratios outside the marine reserve were skewed towards the females, a result of size selective exploitation. Size at sex change was also significantly smaller for C. cristiceps in the exploited area, but not so for C. laticeps. This difference between the species was explained as a function of the size at recruitment into the fishery and the degree of protection afforded both large females and male fish. Considering the possibility that reproduction could be impaired as a result of changes in population structure, the tactic of protection through marine reserves is supported as a hedge against recruitment failure. © 1993 Kluwer Academic Publishers.
Authors & Co-Authors
Buxton, Colin D.
South Africa, Grahamstown
Rhodes University
Statistics
Citations: 145
Authors: 1
Affiliations: 1
Identifiers
Doi:
10.1007/BF00005979
ISSN:
03781909
e-ISSN:
15735133
Study Design
Cross Sectional Study
Study Locations
South Africa
Participants Gender
Male
Female