Aspectos reprodutivos do Cichla monoculus. (tucunaré comum) no período de enchente e da vazante no lago do Parananema, Parintins-AM

Abstract

Data on the reproductive biology of Cichla monoculos (tucunaré) in the flood period and ebb in floodplain lakes is of great importance for increasing knowledge about these animals, especially in the seasonal period. To analyze the reproductive aspects of this species in the Parananema lake, 57 animals were captured between October and November 2018 and 30 specimens were collected from January to February 2019. The samples were collected from 7 to 10 hours (ebb) and 16 at 18 hours (flood), using trawlers (this method of fishing allowed the collection of small fish), as well as, tarrafa, hooks and hammers (methods of capturing larger animals). In the region where the collection was made, only the species Cichla monoculus was found. After capture, each fish was measured using tape measure in centimeters and weighed using scales in grams. The observation of the gonads for sex determination was performed after ventral section of each animal. The stages of gonadal maturation were defined based on the morphology of the gonads, and both sexes allowed characterizing the four stages of development: immature, maturing, mature and emptied. The females presented the different phases of the gonadal development, being able to affirm that it is a split spawning.