イカナゴ仔魚の飢餓耐性〔英文〕

概要

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The ability of newly hatched larvae of the Japanese sand eel to resist starvation was studied in a rearing experiment. The starved larvae were all dead by day 14 at 15.5°C, by day 20 at 10.5°C, and by day 24 at 6.5°C. During 23 days starvation at 6.5°C, the dry weight of the larvae dccreased from 33.9μg at hatching to 22.3μg, and SL decreased from 5.57mm at complete yolk-sac absorption to 5.10mm. The percentage survival on day 24 in the delayed feeding experlment was 55% for the larvae fed from day 2, 48% for day 5, 59% for day 9, 53% for day 12, 30% for day 13, 17% for day 14, 11% for doy 15, 9% for day 16, and 9% for day 17. A clear point of no return was not found and a long duration of recoverable starvation, about 9 days, was estimated. Even some of the larvae that were fed from day 17 ingested food and grew. These results show that the toleramce of starva-tion of the sand eel larvae has a wide range and that some of the larvae have high resistance to starvation.