Abstract
Two hormone injections, a primer and a resolver, were used to induce spawning in grey mullet. Combinations of carp pituitary homogenate (CPH), human chorionic gonadotropin (HCG) and luteinizing hormone-releasing hormone analogue (LHRH-a), each used as a primer or resolver, were tested in 60 spawning attempts. Another six fish received saline injections and served as sham controls. The cost and the response, in terms of spawning and fertilization rates, of each combination were evaluated. The CPH/LHRH-a treatment is the most reliable and cost-effective method. HCG can replace CPH in this treatment, but the cost is higher and the response poorer. The HCG/LHRH-a treatment can, however, be used for research purposes.
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