Settling and raising postlarval abalone Haliotis diversicolor
supertexta (Lischke) on microparticulate diets embedded in a layer of
alginate
A.
Stott, T. Takeuchi, Y. Koike, O. Imada-2003
Aquaculture
Research, 34(7): 561-567
Abstract:
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
µm
and 996±220
µm compared to 786+/-141 µm..
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
µm
compared to 728±89
µm
and 717±90
µm.
The artificial micro diets used in this study were comparable to diatoms in
terms of grow and survival of postlarval H. diversicolor supertexta.
(Department of Aquatic Biosciences, Tokyo
University of Fisheries, Konan, Minato, Tokyo 108-8477, Japan. E-mailof T.
Takeuchi: take@tokyo-u-fish.ac.jp)