Life-history changes in exploited reef fishes on the east coast of South Africa

The effects of exploitation on reef-dwelling fish are investigated. Changes in the life-history characteristics of two different sex-changing, reef-dwelling sparid species are analyzed to determine the total impact of human activities. The life-cycle characteristics of fish populations inside a larg...

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Bibliographic Details
Published in:Environmental biology of fishes 1993-01, Vol.36 (1), p.47-63
Main Author: Buxton, C.D. (Rhodes Univ., Grahamstown (South Africa). Dept. of Ichthyology and Fisheries Science)
Format: Article
Language:English
Subjects:
AFRIQUE DU SUD
AGE
Agnatha. Pisces
AMBIENTE MARINO
Animal and plant ecology
Animal, plant and microbial ecology
Animals
Biological and medical sciences
Chrysoblephus laticeps
CICLO VITAL
CYCLE DE DEVELOPPEMENT
Demecology
EDAD
FISHES
Fundamental and applied biological sciences. Psychology
GROWTH RATE
INDICE DE CRECIMIENTO
LIFE CYCLE
Marine
MARINE ENVIRONMENT
MILIEU MARIN
PECES
POISSON (ANIMAL)
PROPORCION DE LOS SEXOS
REPRODUCCION
REPRODUCTION
SEX RATIO
SOUTH AFRICA
SUDAFRICA
TAUX DE CROISSANCE
Vertebrata
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Summary:The effects of exploitation on reef-dwelling fish are investigated. Changes in the life-history characteristics of two different sex-changing, reef-dwelling sparid species are analyzed to determine the total impact of human activities. The life-cycle characteristics of fish populations inside a large marine reserve are compared to the characteristics of fish populations located outside the reserve. The two fish species used in the analysis, Chrysoblephus laticeps and C. cristiceps, both have long life spans. Exploitation of the fish tended to reduce the male:female ratio. Effects of this reduction on the fecundity of the fish are discussed.
ISSN:0378-1909
1573-5133
DOI:10.1007/bf00005979