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Biologia Reprodutiva do Agulhão Negro, Makaira nigricans Lacépède, 1803, no Atlântico Ocidental Tropical

DOI: http://dx.doi.org/10.17080/1676-5664/btcc.v8n1p59-73

http://www.periodicos.ufra.edu.br/index.php?journal=tjfas 

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Carolina M. T. Silva1, Paulo Travassos2, Marina Figueiredo1, Fábio Hazin2, Patrícia Pinheiro3 & Francisco Pessoa4

 

Resumo: O presente trabalho tem como objetivo obter informações sobre a biologia reprodutiva do agulhão negro, Makaira nigricans, como base para as ações de manejo e conservação no Oceano Atlântico. As amostras foram coletadas no período de dezembro de 2004 a novembro de 2005, medindo-se o comprimento da mandíbula inferior até a furca da nadadeira caudal (MIF) dos exemplares amostrados. Das gônadas foram tomadas as medidas de comprimento, largura e peso, cujos estágios microscópicos foram analisados através de cortes histológicos, determinando uma escala de seis estágios maturativos para as fêmeas e quatro para os machos. Foi amostrado um total de 418 indivíduos, sendo 260 machos e 158 fêmeas, com uma proporção sexual de 1,6M : 1,0F. O comprimento (MIF) das fêmeas variou de 104 cm a 345 cm, com uma moda na classe de 205 - 220 cm e dos machos, variou de 100 cm a 267 cm, com uma moda na classe de 175 - 190 cm. O tamanho médio de primeira maturação sexual foi estimado em 183,5 cm (fêmeas) e 150,1 cm (machos). O índice gonadal (IG) para as fêmeas no primeiro semestre foi mais elevado no mês de abril e, no segundo semestre, nos meses de setembro-outubro; para os machos, no primeiro semestre ocorreu em abril e maio e, no segundo, nos meses de setembro-outubro em sincronismo com as fêmeas. O tipo de desova é parcelado e a costa brasileira pode ser caracterizada como uma área de maturação e repouso, mas não de desova. A fecundidade em fêmeas com 272 cm a 290 cm (MIF) variou de 2.151.000 a 6.769.060 ovócitos.

Palavras-chave: agulhão negro, Makaira nigricans, época de reprodução, tamanho na 1ª maturidade sexual, fecundidade, Atlântico ocidental

 

Abstract: This paper has the main objective of gathering information about the reproductive biology of blue marlin, Makaira nigricans, as a basis for management and conservation actions in the tropical western Atlantic. The biological samples were collected from December 2004, and November 2005, for data on the fish fork length (FL). The length, width and weight of the gonads were also taken, and their microscopic stages were analyzed through histological cuts and evaluated under optical microscopy. A total of 418 individuals were sampled, being 260 males and 158 females. The fork length of females ranged from 104 cm to 345 cm, with its modal value in the 205 – 220 cm class, and that of males ranged from 100 cm to 267 cm, with its modal value in the 175 – 190 cm class. The microscopic maturity scale is composed of six stages for females and four stages for males. The sex ratio was 1.6 M: 1 F. The mean size at first sexual maturity of females and males was estimated as 183.5 cm FL and 150.1 cm FL The gonad index for females at the first semester was higher in April, and at the second semester, in September – October, whereas for males, it was higher at the first semester in April - May, and the second, in September - October, synchronized with the females'. The species' spawning is of the multiple type, but its area of occurrence off the Brazilian coast may be meant only as one for gonad maturation and resting, but not for spawning itself. The fecundity varied from 2,151,000 to 6,769,060 oocites for females between 272 and 290 cm FL.

Key words: blue marlin, Makaira nigricans, spawning season, size at the first sexual maturity, fecundity, western Atlantic.

 

1 Estudante de Pós-graduação da UFRPE.
2 Professor UFRPE (p.travassos@depaq.ufrpe.br)
3 Pesquisador do Laboratório de Ecologia Marinha, do Depto. de Pesca e Aqüicultura, da UFRPE.
4 Estudante UFRPE.

 

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