Abstract
O objetivo deste estudo foi avaliar a estratégia reprodutiva de Aequidens tetramerus em pequenos riachos na bacia do rio Machado, sudoeste da Amazônia. As amostras foram coletadas em dois igarapés, utilizando rede de cerco e redes de mão ao longo de um trecho de 50 m do igarapé. Foram coletados 86 indivíduos, sendo 19 machos e 67 fêmeas (proporção-sexual, 3,52 fêmea:1macho). O tamanho dos indivíduos variou de 1,5 a 11,5 cm. O tamanho da primeira reprodução para fêmeas foi de 1,8 cm e dos machos 2,0 cm. A estação reprodutiva da espécie ocorreu no período seco.
Highlights
Knowledge of the reproductive cycle of ishes, including endogenous and exogenous factors that control this activity, are crucial to establishing stock management programs (MIAH, 2015)
Recurrent changes in environmental conditions affect fish phenology (CHAPMAN et al, 2005), which is mostly inluenced by rainfall and biotic conditions in the tropics (RANGEL-SERPA; TORRES, 2015)
Natural reproductive biology of A. tetramerus was just investigated in varzea areas of the middle Solimões river (SILVA et al, 2014)
Summary
Knowledge of the reproductive cycle of ishes, including endogenous and exogenous factors that control this activity, are crucial to establishing stock management programs (MIAH, 2015). Our objective was to produce information about sexual maturity, oocyte diameter, sex ratio, fecundity and reproductive period of A. tetramerus in small streams of the Machado river basin, state of Rondônia, southwestern Amazonia.
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