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Variaciones de los niveles de grasa y proteína en la leche de la foca de Weddell (Leptonychotes weddellii Lesson, 1826) en la isla Laurie, Antártica: estudio preliminar

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Evaluación preliminar del efecto de la hormona juvenil III y del metil farnesoato en la calidad de espermatóforos del camarón blanco, Litopenaeus vannamei Boone, 1931 (Decapoda: Penaeidae)

RESEARCH NOTE

Variación espacial y temporal de la composición por tallas y sexos del gatuso Mustelus schmittiSpringer, 1939 capturado por la pesca de arrastre en la costa oceánica uruguaya durante 2004

Authors

CORRESPONDING

Inés Pereyra

gatuso@dinara.gub.uy

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Dirección Nacional de Recursos Acuáticos (DINARA), Departamento de Biología Pesquera, Constituyente 1497, C. P.: 11200-P.O. Box 1612, Montevideo, Uruguay

Luis Orlando

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Dirección Nacional de Recursos Acuáticos (DINARA), Departamento de Biología Pesquera, Constituyente 1497, C. P.: 11200-P.O. Box 1612, Montevideo, Uruguay

Walter Norbis

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Dirección Nacional de Recursos Acuáticos (DINARA), Departamento de Biología Pesquera, Constituyente 1497, C. P.: 11200-P.O. Box 1612, Montevideo, Uruguay

Laura Paesch

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Dirección Nacional de Recursos Acuáticos (DINARA), Departamento de Biología Pesquera, Constituyente 1497, C. P.: 11200-P.O. Box 1612, Montevideo, Uruguay

Abstract

This study analyses the seasonal fisheries and sexual proportion of the narrownose smooth-hound Mustelus schmitti from the Uruguayan oceanic coast. The maximum catches took place during the fall. Of a total of 2105 individuals, 1483 were males and 622 females, being females larger than males. Females were dominant at maximum depths of 50 m (inner shelf), whereas males occupied major depths of 50 m (outer shelf). The great proportion of mature females on the inner shelf during spring and summer, and mature males in summer are related to the mating, ovulation and delivery time as previously proposed for this shark in this area. The length in which 50% of the females were retained was below or on the length of sexual maturity of the narrownose smooth-hound, indicating that these are more affected by the fishing activity. Nevertheless, an important fraction of the population that distributes on the inner and outer shelf during the time of parturition, ovulation and mating would be protected in spring and summer by the establishment of fishing bans of the fishes Cynoscion guatucupa and Merluccius hubbsi

Key words

Coastal shark, size composition, fishery, Uruguayan coastal shelf, southwestern Atlantic

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