Aspectos reprodutivos do camarão Macrobrachium amazonicum(HELLER, 1862) em reservatório da mesorregião do sertão pernambucano

Abstract

Knowledge of the morphometricand reproductive aspects of Macrobrachiumamazonicum(HELLER, 1862) is a basic toolfor the elaboration of adequate management, conservation and exploitation strategies. The objective of the present study was to study the morphometricand reproductive aspects of M. amazonicumin the Cachoeira II reservoir, located in Serra Talhada, a mesoregion of the Pernambuco sertão. The prawns werecollected monthly between June 2016 and May 2017. From the morphometric measurements the relative growth was analyzed and classified as allometry. A macro and microscopic analysis atovaries was performed to classify the maturational stages and estimated the size of the first maturation. A total of 432 specimens (86 males and 346 females) were sampled. The sex ratio was statically different from 1: 1 in all months, in favor of females. The reproductive period of the studied population was continuous, with annual reproductive peaks between September and November beyond February, corresponding to the period of rainfall. Thefecundity ranged from 128 to 2724 eggs, being related to the size of the females. The largest specimen captured was male, measuring 87.13 mm, against 80.63 mm of the opposite sex.Six stages of development were found: immature, developing, developed, spawned in development, spawned and rested. Based on these analyzes the size of the first maturation of the females was identified in 9.46 mm of cephalothorax length and,soon,suggested as the minimum size of capture.