Settling and raising postlarval abalone Haliotis diversicolor supertexta (Lischke) on microparticulate diets embedded in a layer of alginate
2003
Stott, A. | Takeuchi, T. | Koike, Y. | Imada, O.
Two 21 day experiments were conducted to determine whether microparticulate diets could be used to substitute for diatoms for raising (Experiment 1) as well as settling and on-growing (Experiment 2) Haliotis diversicolor supertexta postlarvae. The experiments were conducted in 10 L flow-through tanks and each diet had three replicate tanks. In experiment 1, three experimental microparticulate diets supplied by a commercial feed company, labelled SF-15, SF-15 (T) and JFY-13-1, were used, and in experiment 2, SF-15 and SF-15 (T). Artificial diets were compared to diatoms in terms of supporting growth and survival. The survival rate for experiment 1 was lowest for JFY-13-1 (0%) and highest for diatoms (12.9±0.8%). The final size of postlarvae fed SF-15 and SF-15 (T) was significantly greater than that of postlarvae fed diatoms, 973±193 micrometer and 996±220 micrometer compared to 786±141 micrometer. In experiment 2, a total number of 501 larvae settled onto plates covered with SF-15, 254 on SF-15 (T) and 1085 on diatoms. The highest survival rate was 33.1±6.9% for SF-15 and the lowest was 17.3±5.0% for diatoms. However, the final length of postlarvae fed diatoms was significantly greater than SF-15 and SF-15 (T); 1018±379 micrometer compared to 728±89 micrometer and 717±90 micrometer. The artificial micro diets used in this study were comparable to diatoms in terms of grow and survival of postlarval H. diversicolor supertexta.
显示更多 [+] 显示较少 [-]