Parâmetros reprodutivos de Apistogramma Agassizii (cichlidae: perciformes) em ambientes de várzea no médio Solimões-AM

Abstract

The species of the genus Apistogramma are widespread in fish trade ornamentai, hence the importance of studying the parameters of the reproductive biology of A. agassizii in lowland environments in middle Solimões. Fish were collected bimonthly at eight locations in Mamirauá, during the period March 2011 to January 2012. We collected a total of 308 individuals. Through observation of the bimonthly frequency of maturity stages of gonads was found sexually active individuals in all sampling months, however predominated in March-11 and January-12. The bimonthly evolution of the gonadosomatic index suggests that the species spawns at the beginning of the flood. The average fecundity was analyzed from five ovaries of females at mature stage and found the average value of 111.40 oocytes (SD = 39.5). The synchronous oocyte development was observed in both groups, characteristic of fish spawning total. The month with the highest incidence reproductive was the month of January 2012 coinciding with the flood, ensuring greater availability of food puppies, minimizing the risk of predation of offspring due to increased shelter.