Effects of Dechlorination Methods of Tap Water on Survival and Growth of Macrobrachium nipponense Larvae

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Tap water is generally used for the rearing experiment of aquatic animals. Dechlorination of tap water is required to eliminate harmful effect of residual chlorine which is used to control the quality of tap water. In this study, the effects of dechlorination methods of tap water on survival and growth of <I>Macrobrachium nipponense</I> larvae were investigated under feeding and non-feeding conditions. Tap water was dechlorinated by three methods, namely aeration, ion-exchange resin and sodium thiosulfate for rearing larvae. The animals were taken from a freshwater lake, Lake Suwa-ko, a brackish water lake, Lake Sanaru-ko, and a river, River Asahina-gawa which flows into Suruga Bay. Larvae from the Lake Suwa-ko and the Lake Sanaru-ko lived longer and reached more advanced stages in the tap water dechlorinated by aeration and ion-exchange resin than those in the same freshwater dechlorinated by sodium thiosulfate. Survival time of larvae from the River Asahina-gawa in tap water dechlorinated by the three methods showed no distinct difference. Moreover, almost all of the larvae did not molt in the freshwater. Adding seawater to the dechlorinated tap water improved the survival rate of larvae irrespective of the dechlorination methods. These results indicate that neither aeration nor ion-exchange resin for dechlorination of tap water affect larval rearing.
日本水産増殖学会の論文