Determinação do sexo em catfish de canal (Ictalurus punctatus) utilizando endoscopia

Abstract

Sex identification in fish is an important practice for the development of broodstock management strategies. Endoscopy can be used for sex identification, although in fish, it is still restricted. Therefore, the objective of this study was to validate the use of rigid endoscope via the urogenital pore to determine the sex of the catfish (Ictalurus punctatus afinesque, 1818). The equipment used was a Multi-Purpose Rigid ™ 30º endoscope, with 2.7 mm in diameter and 18 cm in length. We examined 60 fish weighing between 86 and 1032 grams, in which the endoscope was introduced via the genital pore and then immediately euthanized to confirm the sex. Gonadal tissue samples were collected for histological assessment of maturation stage and sex confirmation. The results showed that of the 60 fish examined, 57 had positive sex confirmation by endoscopy, corresponding to 95% of the sample. The results show that it is feasible the use of endoscopy for sex determination in catfish via genital pore.