Effect of Water Temperature on the Survival Rate of Swimming Crab, Portunus trituberculatus, Larvae Reared at pH9.25.
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Accession number;01A0744147
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| Title;Effect of Water Temperature on the Survival Rate of Swimming Crab, Portunus trituberculatus, Larvae Reared at pH9.25. |
| Author;
YASUNOBU HIDEKI
(Hyogo Prefect. Fish. Exp. Stn.)
NAGAYAMA HIROTOSHI
(Hyogokensaibaigyogyose)
IKI HIDETAKA
(Hyogokensaibaigyogyose)
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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.181-184(2001)
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| Figure&Table&Reference;FIG.2, REF.11 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;In order to prevent fungal infection caused by Halocrusticida okinawaensis in swimming crab, Portunus trituberculatus, larvae are reared at pH9.25 in hatcheries based on our previous report. In the present study effect of water temperature on the survival rate of swimming crab larvae reared at pH9.25 was investigated. Acute toxicities of pH9.25 to swimming crab zoea-I were not observed at ammonia-N concentrations lower than 1.MU.g/ml at 20-30.DEG.C., but a lower survival rate of larvae was observed at 30.DEG.C. when ammonia-N concentration was 8.MU.g/ml. In the experiment on long-term effect of pH9.25 where larvae from zoea-I through zoea-IV were reared for 12-14 days at around 20.DEG.C. or for 7-8 days at 25,27 and 30.DEG.C., survival rates of swimming crab larvae reared at pH9.2 were reduced at temperatures higher than 27.DEG.C.. These results indicate that the pH9.25 rearing method as a prophylactic measure against fungal infection can be applied when water temperature is lower than 27.DEG.C.. (author abst.) |
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