Sharks caught in the protective gill nets off KwaZulu-Natal, South Africa. 11. The scalloped hammerhead shark Sphyrna lewini (Griffith and Smith)

Between 1978 and 1998, a total of 3 385 scalloped hammerhead sharks Sphyrna lewini was caught in the protective nets off KwaZulu-Natal. The mean annual catch was 166 sharks (range 60-279). There was a significant decrease in catch rate with time, but the relationship with the population size in KwaZ...

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Bibliographic Details
Published in:African journal of marine science 2005-12, Vol.27 (3), p.517-528
Main Authors: De Bruyn, P. (Nelson Mandela Metropolitan Univ., Port Elizabeth (South Africa). Dept. of Zoology), Dudley, S.F.J, Cliff, G, Smale, M.J
Format: Article
Language:English
Subjects:
AFRIQUE DU SUD
AIRE DE NURSERIE
CPUE
DIGESTA
DISTRIBUCION GEOGRAFICA
DISTRIBUTION
DISTRIBUTION GEOGRAPHIQUE
EMBRYOS
ESTOMAC
ESTOMAGO
GEOGRAPHICAL DISTRIBUTION
GILL NETS
GILLNETS
LENGTH FREQUENCY
LENGTH-WEIGHT RELATIONSHIPS
MADUREZ SEXUAL
MANET
Marine
MATURITE SEXUELLE
MATURITY
NURSERY GROUNDS
PERFORMANCE DE REPRODUCTION
REPRODUCTION
REPRODUCTIVE PERFORMANCE
REPRODUCTIVIDAD
REQUIN
SEASONAL VARIATION
SEASONALITY
SEXUAL MATURITY
SHARKS
SOUTH AFRICA
Sphyrna lewini
STOMACH
STOMACH CONTENTS
SUDAFRICA
TIBURON
TRASMALLO
VARIACION ESTACIONAL
VARIATION SAISONNIERE
ZONAS DE ALEVINAJE
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Summary:Between 1978 and 1998, a total of 3 385 scalloped hammerhead sharks Sphyrna lewini was caught in the protective nets off KwaZulu-Natal. The mean annual catch was 166 sharks (range 60-279). There was a significant decrease in catch rate with time, but the relationship with the population size in KwaZulu-Natal waters is unknown. Size and sex segregation is indicated. Sizes-at-50% maturity were 161.5cm (males) and 183.1cm (females). Most of the catch (91%) was immature, but neonates are poorly sampled by the 51-cm meshed nets. In small animals (
ISSN:1814-232X
1814-2338
DOI:10.2989/18142320509504112