Effect of temperature on yolk sac utilisation and growth of newly hatched larvae of cobia Rachycentron canadum (Linnaeus, 1766)
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Authors
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M. Sakthivel
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R. Jayakumar
CMFRI
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A. K. Abdul Nazar
CMFRI
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G. Tamilmani
CMFRI
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P. Rameshkumar
CMFRI
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C. Kalidas
Scientist
Mariculture Division
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M. Anbarasu
CMFRI
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V. Balamurugan
CMFRI
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R. Thiagu
CMFRI
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S. Sirajudeen
CMFRI
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G. Gopakumar
CMFRI
Abstract
The effect of temperature on the utilisation of yolk-sac and growth in terms of length of the larvae of cobia Rachycentron canadum (Linnaeus, 1766) was investigated. Five temperature levels viz., 29, 30, 31, 32 and 33°C were experimented with the newly hatched larvae for a total duration of 52 hours post-hatch (hph). A clear-cut trend of increase in larval length with increase in temperature was noted. The maximum length recorded was 4.41±0.11 mm at 33°C by the end of the experiment. The yolk-sac volume decreased proportionately with rise in temperature. At the end of 52 hph, the lowest yolk-sac volume was recorded at temperature range of 31 to 33°C. Results of the present study suggest that temperature plays a vital role in the yolk-sac utilisation as well as on growth of cobia larvae.
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