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length at first maturity of two species of lantern sharks (etmopterus spinax and etmopterus pusillus) off southern portugal

Published online by Cambridge University Press:  06 October 2005

rui coelho
Affiliation:
universidade do algarve, ccmar/fcma, campus de gambelas, 8000 faro, portugal, internet: www.ualg.pt/fcma/cfrg
karim erzini
Affiliation:
universidade do algarve, ccmar/fcma, campus de gambelas, 8000 faro, portugal, internet: www.ualg.pt/fcma/cfrg
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Abstract

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etmopterus spinax and etmopterus pusillus are captured in large quantities in some deep-water fisheries along the portuguese coast and are always discarded. specimens were collected from february 2003 to may 2004 from deep-water fisheries and classified as mature or immature. maturity ogives were fitted and size at first maturity estimated for each sex of each species. both species are late maturing, with the maturity sizes varying between 75% and 87% of the maximum observed sizes, depending on species and sex. for both species, females tended to mature at and grow to larger sizes than males. the late maturation of these deep-water shark species makes these populations extremely vulnerable to increasing fishing mortality.

Type
research article
Copyright
© 2005 marine biological association of the united kingdom