Resumo
This paper deals with the schooling structure of Brazilian-sardine, Sardinella brasiliensis (Steindachner, 1879), in coastal waters of Rio de Janeiro State (Brazil). Samples were obtained from schools caught by commercial fishery in the area of Angra dos Reis (23º-24ºS, 44º-45ºW), from autumn/1999 to summer/2000, comprising 2,278 fishes. In average, males had total lengths and weights lower than those of females, with major differences in weights. Seasonal fluctuations of average total weights are associated with the annual reproduction cycle and condition factor, mainly in females. Sex-ratio was around 1:1, except in winter, when females were in majority. Mature males and females were found all along the year, with a peak in the spring-summer, showing a long reproduction period of successive spawning of reproducers in a same school, since individual spawning is complete. Total lengths when 50% of fishes are mature differ between males (18.2 cm) and females (19.2 cm). The schools can be considered as spawning schools, as they were found in a spawning ground, and consisted almost exclusively of adults, with a long annual reproduction period.
Brazilian-sardine; Sardinella brasiliensis; schooling structure; Rio de Janeiro; Southeast Brazil
Brazilian-sardine; Sardinella brasiliensis; schooling structure; Rio de Janeiro; Southeast Brazil
Estrutura de cardumes da sardinha-verdadeira, Sardinella brasiliensis (Steindachner, 1879), no estado do Rio de Janeiro (Brasil)
Schooling structure of Brazilian-sardine, Sardinella brasiliensis (Steindachner), in the State of Rio de Janeiro (Brazil)
Melquíades Pinto PaivaI,II; Ana Paula da Costa FalcãoI
IDepartamento de Biologia Marinha, Universidade Federal do Rio de Janeiro. Cidade Universitária, Ilha do Fundão, 21944-970 Rio de Janeiro, Rio de Janeiro, Brasil
IIPesquisador do Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
ABSTRACT
This paper deals with the schooling structure of Brazilian-sardine, Sardinella brasiliensis (Steindachner, 1879), in coastal waters of Rio de Janeiro State (Brazil). Samples were obtained from schools caught by commercial fishery in the area of Angra dos Reis (23º-24ºS, 44º-45ºW), from autumn/1999 to summer/2000, comprising 2,278 fishes. In average, males had total lengths and weights lower than those of females, with major differences in weights. Seasonal fluctuations of average total weights are associated with the annual reproduction cycle and condition factor, mainly in females. Sex-ratio was around 1:1, except in winter, when females were in majority. Mature males and females were found all along the year, with a peak in the spring-summer, showing a long reproduction period of successive spawning of reproducers in a same school, since individual spawning is complete. Total lengths when 50% of fishes are mature differ between males (18.2 cm) and females (19.2 cm). The schools can be considered as spawning schools, as they were found in a spawning ground, and consisted almost exclusively of adults, with a long annual reproduction period.
Key words: Brazilian-sardine, Sardinella brasiliensis, schooling structure, Rio de Janeiro, Southeast Brazil
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AGRADECIMENTOS. Os autores agradecem o apoio recebido da empresa Castro Indústria e Comércio de Pescados Ltda. (Angra dos Reis - RJ - Brasil), na pessoa do seu diretor-presidente Isake de Castro.
Recebido em 24.VI.2002; aceito em 08.XI.2002.
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Datas de Publicação
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Publicação nesta coleção
03 Jun 2009 -
Data do Fascículo
Dez 2002
Histórico
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Aceito
08 Nov 2002 -
Recebido
24 Jun 2002
