Biologia reprodutiva de Trachelyopterus galeatus (Actinopterygii: Auchenipteridae) na Lagoa de Jequiá, Resex Marinha Lagoa do Jequiá, Alagoas

Abstract

The present work objectified to describe aspects of the reproductive biology of species T. galeatus, such as: stadiums of gonadal development (EDG), sexual ratio between males and females, size of the first sexual maturation (L50), relation weight-length, gonodosomatic index (IGS) and fertility. The analyzed units, had been proceeding from fish artisan of the Reserve Extractivist Marine Lagoon of Jequiá, the collections had happened between March of 2017 and March of 2018. They had been identified, measured and weighed 136units of T. galeatus, of which, 73 were female and 63 were male. The macroscopicclassification of maturacionals stadiums was confirmed through of the analysis of thehistological gonads. Both the sexes had presented negative allometry, indicating biggerincrement in length than weight. The sexual ratio for the total period was of 1M: 1,15F.Peaks of IGS had been registered for the sexes grouped in the months of May, June and July, corresponding to the period of bigger rainfall precipitation of the region. Five maturacionals stadiums for females (A, B, C, D and E) had been found and three for the males (A, B and C). The average absolute fertility of ovocytes was of 5518,2 (±2736,3). The estimated size for the first sexual maturation was of 154 mm for the grouped sexes. From these data, therefore, they are suggested measured of management, as the establishment of the period of reproduction of the species during the months May to August, and definition of the minimum size of capture being 154,0 mm.