Abstract
The aim of this work is to control the water environment for culturing larvae of the swimming crab, Portunus trituberculatus, using microorganisms. The bacterial strain PM-4 (Thalassobacter utilis) improved the survival rate of crab larvae and repressed the growth of Vibrio anguillarum (bacterium) and Haliphthoros sp.(fungus) in seawater. PM-4 was cultured and added daily to seawater during the first to third zoean growth stage of the crab with diatoms and rotifers. Numbers of PM-4 decreased in culture water during the first 3 days, because of feeding by the first zoean stage of larvae. The final concentration of PM-4 was 105 to 106 cells m1−1 according to the plate count method in larval rearing water. During 1989 to 1993, we tried seed productions of a swimming crab in 200 m3 containers at Tamano Station, Japan Sea-Farming Association. In 33 trials of the biocontrol methods, average survival rate of crab larvae was 28.3% when the bacterial strain PM-4 was added. In 42 trials in which the strain PM-4 was not added, average survival rate of crab larvae was 15.6%. We conclude that the bacterial strain PM-4 is effective as a biocontrol agent.
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© 1997 Springer Science+Business Media Dordrecht
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Nogami, K., Hamasaki, K., Maeda, M., Hirayama, K. (1997). Biocontrol method in aquaculture for rearing the swimming crab larvae Portunus trituberculatus . In: Hagiwara, A., Snell, T.W., Lubzens, E., Tamaru, C.S. (eds) Live Food in Aquaculture. Developments in Hydrobiology, vol 124. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-2097-7_46
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DOI: https://doi.org/10.1007/978-94-017-2097-7_46
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