Abstract
Fish species composition in two permanent floodplains (Beels) was monitored during 1992–1999. In one, small prawns (Macrobrachium spp.) replaced `beel-resident' species such as Puntius sophore, Colisa fasciatus, and Mastacembelus pancalus, while in the other beel no significant changes were observed. The reduction of the water area of the affected beel during the dry season and a resulting increase of the fishing effort was the main cause. The results are discussed in the context of overall developments in floodplain fisheries related to water and fisheries management and led to the formulation of a rapid fish biodiversity method.
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