Effect of LHRHa on the reproductive performance of spotted sand bass Paralabrax maculatofasciatus (Steindachner, 1868).

Hormonal induction was investigated in order to induce and synchronize the spawning of spotted sand bass ( Paralabrax maculatofasciatus ). We conducted three experiments with wild fish captured in the Gulf of California: 1) Spawning induction with LHRHa, 2) LHRHa effects on motility and sperm cell density (both experiments using LHRHa concentrations of 25, 50, 100 µg kg -1 and saline solution), 3) Induction and incubation of spawns obtained with LHRHa, using concentrations of 12. 5, 25, 50 µg kg -1 and saline solution. In experiment 1, a higher spawning ratio was observed in the conce ntration of 25 µg kg -1 ; however, no significant differences were observed in the proportion of floating (viable) eggs. In experiment 2, significant differences ( P P µg kg -1 showing the higher densities. In experiment 3, significant differences ( P µg kg -1 , respectively. Survival at hatching and proportion of live yolk-sac larvae were significantly higher ( P µg kg -1 . In this work, LHRHa was e ffective in inducing and synchronizing the spawning of spotted sand bass, the product of which will be used f or massive egg production.