Application of microparticle diets for Japanese flounder Paralichthys
olivaceus larvae
Q.
Wang, T. Takeuchi, T. Hirota, S. Ishida, H. Miyakawa, H. Hayasawa-2004
Fisheries
Science,
70(4): 611-619
Abstract:
A
feeding trial was conducted with two newly developed microparticle diets
(MD-Q and MD-V), which differed in the mixing ratios of two types of casein
hydrolysates (C700 and C800) as the protein source. The ratio of C700 and
C800 were adjusted to 7:3 in MD-Q and 6:4 in MD-V, respectively. Japanese
flounder larvae were fed from 7 days after hatching (d.a.h.) to 32 d.a.h.
on live food (LF), MD solely, MD + 1/3 LF (either of the MD
and one-third quantity of the live food) and 1/3 LF (one-third quantity
of live food alone), respectively. They were then switched to Kyowa diet B
from 33 d.a.h. until 40 d.a.h. The larvae fed on MD-Q exclusively
had a higher survival rate (36.4%) than those fed on MD-V (24.2%) by 22 d.a.h.
Unfed larvae could survive up to only 12 d.a.h. Larvae fed on MD-Q + 1/3 LF
also had a significantly higher survival rate (34.2%) than those on MD-V +
1/3 LF (16.3%) and 1/3 LF solely (15.4%) at 32 d.a.h. These
results suggest the potential of MD-Q as a part replacement for LF from the
early developmental stage in the seed production of Japanese flounder.
(Faculty
of Marine Science, Tokyo University of Marine Science and Technology,
Minato, Tokyo 108-8477, Japan, e-mail of T. Takeuchi: take@s.kaiyodai.ac.jp)