不同单胞藻饵料培养九孔鲍早期稚贝的研究

Postlarva rearing of abalone Haliotis diversicolor supertexta with different unicelluar algae species

以单种培养的6种底栖硅藻和具有底栖习性的亚心形扁藻(Platymoras sp.)为饵料,培养九孔鲍(Haliotis diversi-color supertexta)受精后12 d的早期稚贝并观察其生长和存活,培养期为28 d,目的是筛选能维持早期稚贝高存活率和生长率的藻种。实验结果表明,培养稚贝成活率最高的3个藻种由大到小依次是爪哇曲壳藻亚缢变种(Achnanthes javanica var.)、流水双眉藻(Amphora fluninensis)和亚历山大菱形藻(Nitzschia alexandrina),使稚贝生长最快的3个藻种由大到小依次是流水双眉藻、爪哇曲壳藻亚缢变种和亚历山大菱形藻。研究结果揭示了适宜的底栖硅藻种类对鲍早期稚贝阶段生长和存活的重要性。个体小或者胞外产物量大的藻类很可能对九孔鲍早期稚贝的培养是有利的。

Haliotis diversicolor supertexta was one of the most important economic mollusca in south China. Because of high motality of this specie in their postlarval phase, which almost destroyed its seedling breeding, it is an urge to study the postlarval feeding ecology for its culture. In this study, six species of benthic diatom and Platymonas sp. with depositing habitat were assayed to evaluate their food value for the postlarvae of Haliotis diversicolor supertexta. Survival rate and growth of 12-day-age postlarvae were recorded continuously by rearing with the seven species alega for 28 d. The high survival rates of postlarvae of Haliotis diversicolor supertexta were found in the treatments of Achnanthes javanica var. , Amphora fluninensis and Nitzschia alexandrina with the relative potency progressively weaker in order. On the other hand, postlarvae of Haliotis diversicolor supertexta grew fast in the treatments of Amphora fluninensis, Achnanthes javanicavar, and Nitzschia alexandrina with the relative potency progressively weaker in order. The results of present work suggests that rearing with appropriate marine benthic diatom species be important to growth and survival of abalone postlarvae. Algae with small size or high extracellular polymers production should be good to postlarvae culture of Haliotis diversicolor supertexta.