Abstract

CONTRERAS-GARCIA, María de Jesús; CONTRERAS-SANCHEZ, Wilfrido M.; HERNANDEZ-VIDAL, Ulises  and  MCDONAL-VERA, Alejandro. Induced spawning of the common snook (Centropomus undecimalis) in captivity using GnRH-a implants. Ecosistemas y recur. agropecuarios [online]. 2015, vol.2, n.6, pp.357-362. ISSN 2007-901X.

Culture of Centropomus undecimalis shows great potential as this species tolerates handling and adapts easily to captivity. However, the difficulty in achieving spawning in captivity is a major obstacle for the development of commercial scale farming. Spawning of common snook was achieved using GnRH-a implants in single 100 and 200 pg doses per fish; control group specimens received no hormone and did not spawn. Both GnRH-a trial doses resulted in spawning with up to 100 % fertilization rates per experimental unit, and a range of 60 - 76 % per treatment, showing no statistical differences (p > 0.05). The percentage of hatching rate was between 50 - 100 % and larvae measured between 1.56 ± 0.08 and 1.98 ± 0.05 mm total length after yolk sac absorption.

Keywords : Centropomus undecimalis; snook; induction to spawning; GnRH-a; quality eggs.