Macroscopic characterization of gonads during induced breeding in captivity of surubim‑do‑paraíba

Abstract

The objective of this work was to describe the morphology of the gonads of surubim‑do‑paraíba (F1) during induced breeding in captivity. Thirty females were induced to reproduction using carp pituitary extract and human chorionic gonadotropin. Twenty‑eight females responded to the induction, releasing 238.80 g of oocytes (fertilization rate: 24.33±8.35%). After stripping of gametes, the animals were euthanized for the morphological analysis of the gonads. Testicles did not present morphological alteration after induction. Among ovaries, 63.31% showed malformation (uneven, not uniform development or “narrowing”), and the number of released oocytes was below the obtained in wild broodstock of this species.