Program and Abstracts(PDF)

1)Hamasaki, K., Tsuruoka, K. Teruya, K. Hashimoto, H. Hamada, K., Hotta, T., and K.
Mushiake. 2009. Feeding habits of hatchery-reared larvae of greater amberjack Seriola dumerili.
Aquaculture, Vol:288. Pp 216-225.
Authors reared greater amberjack larvae to investigate their feeding habits during the early phase
of seed production. Larvae were fed on three types of rotifers with different body sizes, and the
survival, growth rate and gut contents of the larvae were examined. As the results of this research,
authors suggest an appropriate feeding schedule for greater amberjack larvae during the early
phase of seed production.
2)Teruya, K., Hamasaki, K., Hashimoto, H., Katayama, T., Tsuruoka, K., Hayashi, T., and K.
Mushiake. 2009. Ontogenetic changes of body density and vertical distribution in rearing tanks in
greater amberjack Seriola dumerili larvae. NipponSuisanGakkaishi,Vol:75. Pp54-63.
To obtain basic knowledge on sinking death syndrome which has been considered to be one of
the causes of early mortality during the seedling production of greater amberjack, ontogenetic
changes of larval body density were examined. A rearing experiment was conducted to
investigate the effects of aeration rate (0.1-2.0L/min) on the vertical distribution, feeding,
survival, growth and initial swim bladder inflation of larvae reared in 500-L tanks for 10 days
post hatching. Greater amberjack larvae showed negative buoyancy. In tanks with aeration of 0.1-
1.0L/min, larvae were distributed in the upper layer in the daytime and on the tank bottom in the
nighttime after 3 days post hatching. Excessive aeration (2.0L/min) caused larvae to disperse in
tanks. However, feeding amounts, and rates of survival, growth and initial swim bladder inflation
of larvae were low in those tanks with rearing seawater of high turbulence. To prevent the larvae
from sinking to the tank bottom, rearing techniques with less physical stress on larvae should be
developed.
3)Hirata, Y., Hamasaki, K., Imai, A., Teruya., K. Iwasaki., T. Hamada, K., and K. Mushiake.
2009. Effects of different photoperiods and water temperatures on survival, growth, feeding and
initial swim bladder inflation of greater amberjack Seriola dumerili larvae.
NipponSuisanGakkaishi,Vol:75. Pp995-1003.
To determine the appropriate rearing conditions for early stage larvae of greater amberjack
Seriola dumerili, we investigated the survival, growth, feeding and initial swim bladder inflation
of larvae reared in two or three replicates in 500 L tanks under different photoperiods (0L: 24D,
12L: 12D, 18L: 6D, 24L: 0D) and water temperatures (22, 24, 26, 28°C). In the 0L: 24D group,
few larvae showed feeding incidence and growth, and total mortality occurred 8 days after
hatching. Photoperiod (12-24 hours light condition) and temperature did not affect the larval
feeding and swim bladder inflation, whereas larval survival and growth were improved in the
18L: 6D group and larval survival was the best at 22°C.
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