Study on large-scale artificial seedling breeding technology of Tapes dorsatus

Based on the problem of seedling supply of Tapes dorsatus, we studied the key techniques of seedling breeding of T. dorsatus by a single factor comparison test, so as to provide references for its large-scale artificial breeding. The results show that: 1) With artificial temperature control, we used the compound algae in shrimp pond to promote the ripening of the parents instead of the pure monocytic algae, and the ripening rate was 282.6% higher than that of the control group. 2) By means of a series of measures such as warming and drying in shade to induce spawning, the rate of induced spawning increased by 50.9% compared with the control group. 3) In order to establish a closed seedling technology model, we added effective microorganisms to build a beneficial micro-ecosystem, and did not change the water during the seedling breeding period. The results reveal that the survival rate of larvae in pelagic period, juvenile growth rate and juvenile rearing rate were significantly higher than those of the control group. 4) We collected the spats by using vertival seedling collection combined with the bottom of the pool. The juvenile rearing rate and yield per unit area increased by 76.6% and 76.5%, respectively. 5) Taking the parents with body mass above 5% as breeding group, the shell length, body mass of juvenile and juvenile rearing rate increased by 6.67%, 17.03% and 8.43%, respectively compared with the control group. However, the variable coefficients of juvenile shell length and body mass decreased by 29.13% and 55.29%, respectively. The realized heritability "h²" of shell length and body mass at the juvenile stage reached 0.65 and 0.72, respectively. This study designed a new integrated innovative technology for the artificial seedling breeding of T. dorsatus, which achieves significant economic benefits and lays a foundation for the realization of its large-scale breeding of seedlings.