Efficiency of stagnant water larviculture using disinfected amictic eggs of the rotifer <Emphasis Type="Italic">Brachionus plicatilis</Emphasis> in Japanese flounder <Emphasis Type="Italic">Paralichthys olivaceus</Emphasis> |
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| Authors: | Tsutomu Tomoda Shigeki Dan Taketoshi Nakamura |
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| Institution: | (1) Notojima Station, National Center for Stock Enhancement, Fisheries Research Agency, Nanao Ishikawa, 926-0216, Japan;(2) Present address: Minamiizu Laboratory, National Research Institute of Aquaculture, Fisheries Research Agency, Minamiizu Shizuoka, 415-0156, Japan;(3) Tamano Station, National Center for Stock Enhancement, Fisheries Research Agency, Tamano Okayama, 706-0002, Japan;(4) Present address: Tamano Laboratory, National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research Agency, Tamano Okayama, 706-0002, Japan;(5) Environmental Science Engineering Department, Toray Techno Co. Ltd., Otsu Shiga, 520-8558, Japan |
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| Abstract: | There is a need to develop low-cost methods for larviculture that emphasize disease prevention. We evaluated stagnant water
larviculture in flounder Paralichthys olivaceus using rotifer amictic eggs treated with glutaraldehyde. Growth and survival of the larvae were similar to in larvae reared
by standard running water larviculture with daily feeding of rotifers (control). In the experimental group, the n-3 highly
unsaturated fatty acid content of rotifers in the rearing water was higher than in the enriched rotifers fed to the control
group. We also observed a similar pattern for the fatty acid composition of flounder larvae. The viable bacterial counts associated
with rotifers in stagnant water were lower than those associated with enriched rotifers, and there were fewer bacterial genera.
However, the viable bacterial count was the same or higher in the experimental rearing water compared with that in the control
group. The α-Proteobacteria and Cytophaga–Flavobacterium–Bacteroidetes group dominated the bacterial community structure after larval hatching. To our knowledge, this is the first time that stagnant
water larviculture, using only disinfected amictic eggs, has been successfully demonstrated on a mass production scale. This
method appears to offer benefits including improved nutrition, more favorable bacterial communities, and lower cost. |
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