REPRODUCTIVE ECOLOGY OF Astyanax lacustris (OSTEICHTHYES: CHARACIDAE) FROM LAGOA DO PIATÓ, ASSÚ, RIO GRANDE DO NORTE, BRAZIL

• Autor(a) principal: da Silva, Danyelle Alves
• Data de Publicação: 2012
• Outros Autores: Rodrigues Pessoa, Emilly Kataline, da Costa, Simone Almeida Gavilan Leandro, Chellappa, Naithirithi Tiruvenkatachary, Chellappa, Sathyabama
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Biota Amazônia
• Texto Completo: https://periodicos.unifap.br/index.php/biota/article/view/499

Biological aspects of the reproductive cycle of Astyanax lacustris were investigated. A total of 360 individuals was captured on a monthly basis using gillnets of4 cm mesh size, from the Piató Lake, Assu, Rio Grande do Norte. The total length, body mass and the stage of gonad maturity were registered. The temporal variations of the gonad development and the fecundity were analyzed. Sex ratio and gonadosomatic relation of females were determined on a monthly basis to verify the reproductive period. The means of the stomach repletion index were established monthly. The results indicate that females were predominant, with a sex proportion of 1M:7F. The macroscopic characteristics of the ovaries and testicles revealed four stages of gonadal development, such as, immature, maturing, mature and spent. A temporal variation was observed for the gonad development of males and females. There was reproductive activity throughout the year, with peaks in the months of February, April and June. The average absolute fecundity was 7.681 mature oocytes, varying from 4.476 to 12.036. There was a positive relation between absolute fecundity and body mass. The feeding activity reduced during the reproductive period.Keywords: fecundity; sex ratio; gonadosomatic relation; gonadal development.