Fecundity and Egg quality of Two Age Class Broodstock of Red Spotted Grouper Epinephelus akaara.

概要

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In order to obtain optimum Broodstock age for seed production of red spotted grouper, Epinephelus akaaya, quantity and quality of naturally spawned eggs were compared within two age-class groups. In the Broodstock of older (about 10-15 years) and younger (about 3-5 years) groups, the amount of eggs produced during the spawning period averaged 2, 480 × 103 and 1, 390 × 103 eggs per fish, respectively. The buoyancy egg of the older group was higher than the younger group. The average egg diameter decreased as spawning progressed in both groups. While, the average egg diameter of the younger group was larger than that of the older group. The hatching rate and the abnormality of hatched larvae varied with spawning days. The survival activity index of starved larvae of the younger group showed higher than that of the older group. Contents of amino acid and lipid of the eggs in the younger group were higher than that of the older group. While, the percentage of n-3HUFA in fatty acid content of the eggs in the older group was higher than that of the younger group, it may be associated with the difference of feed quality. The results demonstrated that the egg quality of red spotted grouper is affected by the Broodstock age and the larvae from a large egg will be a better survivor on account of having a lot of energy source.
日本水産増殖学会の論文