Effects of Feeding Levels on the Growth and Survival of Larval and Juvenile Japanese Flounder Paralichthys olivaceus.
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Accession number;01A0744151
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| Title;Effects of Feeding Levels on the Growth and Survival of Larval and Juvenile Japanese Flounder Paralichthys olivaceus. |
| Author;
MOBIN S M A
(Nagasaki Univ., Nagasaki, Jpn)
KANAI K
(Nagasaki Univ., Nagasaki, Jpn)
YOSHIKOSHI K
(Nagasaki Univ., Nagasaki, Jpn)
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Journal Title;Suisan Zoshoku
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Journal Code:Y0285A
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ISSN:0371-4217
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VOL.49;NO.2;PAGE.207-218(2001)
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| Figure&Table&Reference;FIG.9, REF.35 |
| Pub. Country;Japan |
| Language;English |
| Abstract;Effects of feeding levels on the growth and mortality of larval and juvenile Japanese flounder Paralichthys olivaceus were studied in two trials. Trial 1 was conducted from 3 to 45d posthatch while trial 2 from 3 to 36d posthatch. In both trials, flounder eggs were hatched and larvae were reared in indoor tanks and fed enriched live feeds, Brachionus plicatilis and Artemia spp. nauplii at four different feeding levels(L1,L2,L3 and L4). The respective food densities of L1,L3, and L4 were 0.5,2.5 and 5 times that at L2. Level L2 is the one conventionally adopted by some hatcheries for the mass production of flounder larvae and juveniles in Japan. At that level, the initial density of rotifers is 0.5 individuals(ind.)/ml culture water; the density gradually increases to approximately 3.5ind./ml after metamorphosis. The initial density of Artemia spp. at L2 is 0.1ind./ml, which gradually increases to 3 ind./ml. The larval and juveniles mean growth rates were dependent on feeding levels. In trial 1, the highest daily growth rates of 18.3% for dry body weight(BW) were observed at L4, followed by L3(17.5%), L2(16.5%) and L1(16.1%). In this trial after reared for 45d, L4 attained the highest BW of 23.9.+-.0.8mg(mean.+-.SE) followed by L3(18.1.+-.0.8mg), L2(12.8.+-.0.9mg) and L1(11.0.+-.0.4mg). In trial 1, the highest cumulative mortality(26%) was at L4 followed by L3(16.6%), L2(11.1%) and L1(6.7%). At 45d posthatch, the total length(TL) and BW differed significantly(P<0.05) between L1 and L3,L2 and L3,L3 and L4,L2 and L4, and L1 and L4. In trial 2, growth and mortality patterns were similar to trial 1. In both trials, the faster growth rates were accompanied by higher cumulative mortalities. (author abst.) |
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