Abstract
This study compared the milt volume, spermatocrit, and sex steroid hormone levels in the blood, and sperm motility and velocity in male longtooth grouper (Epinephelus bruneus), with the application of human chorionic gonadotropin (hCG). The experimental group was injected with 500 IU hCG/kg body weight, whereas the control group was injected with saline solution (0.9% NaCl). The results indicated the former showed significantly higher levels of milt volume and spermatocrit than the latter, whereas sperm motility and velocity showed no significant differences between the two groups.<BR> Regarding the analysis of sex steroid hormone levels in the blood, the plasma testosterone (T) and 11-ketotestosteorne (11-KT) levels of the group with hCG was significantly higher than those of the control two and seven days after the injection respectively. Therefore, hCG administration increased the plasma sex steroid hormone levels (T and 11-KT) and sperm volume of male longtooth grouper, whereas it had no effect on the sperm quality (i.e., motility and velocity). In follow-up research, the fertilization and hatching rates based on the sperm analysis will be compared and investigated to provide basic data for breeding in this species.
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