Descrição macroscópica e microscópica de gônadas de híbridos de siluriformes de importância comercial

Abstract

In this research, made between February and March 2016, the biometric analysis of females of siluriform hybrids was carried out, also the macroscopic and histological evaluation of their gonads, in order to know some reproductive characteristics of these hybrid animals of commercial interest in the state of Mato Grosso do Sul. The gonads for study were got from 15 females of hybrid fish semicolon resulting from the crossing of Pseudoplatystoma corruscans x Pseudoplatystoma reticulatum and 13 females of hybrid fish jundiara, crossing of Leiarius marmoratus x Pseudoplatystoma reticulatum, slaughtered in the refrigerator, when they were observed macroscopically, their biometrics were performed and fragments were removed for histological processing. slaughtered in the refrigerator, when they were observed macroscopically, their biometrics were performed and fragments were removed for histological processing. In the Animal Morphology Laboratory of Agrarian Sciences College, Universidade Federal da Grande Dourados, all the histomorphological stages of the gonads were performed. After data evaluation, the mean value of the following biometric variables was obtained for female semicolons: standard length equal to 34.43 ± 5.7cm, body weight, 1785.53 ± 483.3g, gonad weight 10.69 ± 2.0g and gonad length 7.04 ± 1.0cm and jundiara hybrids, 49.50 ± 2.3cm, 1900.62 ± 205.4g, 1.15 ± 0.4g and 3.99 ± 0.9cm, respectively. And according to the stage of gonadal development, it can be observed that females of both hybrids’ present variations in their reproductive stage during the studied period, where the semicolon females were in an intermediate maturation stage and the jundiara their ovaries were in an initial stage of development, immature. In the histological analysis of the ovaries, the presence of the following cell types can be verified: ovogen, perinucleolar and cortical alveolus. Therefore, there is the possibility of the reproductive cycle of these hybrid animals, as well as the appearance of germ cells, its differentiation, development, maturation.