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6.2.1 Ichthyofauna diversity
The faunistic composition of these lakes generally reflects the diversity of the parent river as well as the state of entrophication of that particular lake. In open-lakes, the catch is dominated by the riverine fauna during flood season. The principle indigenious fishes inhabiting these lakes are 58 spp. belonging to 34 genera from these lake indicates that the resources supports rich and varied indigenous stocks of carps, catfishes, feather backs, snake heads, herring, gobies, perches, needle fish, mud eel, spiny eel, loaches etc. Because of the ecological changes of these lakes from oligotrophic to eutrophic, the fish spp. goes on changing. The members of Notopteridae, Siluridae, Bagridae, Sisoridae and Schilbeidae are encountered mostly in the open type lake. The ecosystem is an important source of food, forage, larvicidal and therapeutically important fishes. Presence of various species may be attributed to nature of basin, type of lake, impact of embankment, intensity of eutrophication and introduction to exotic. Table: 12.6. Estimated fish yield of some oxbow lakes of Ganga, Brahmaputra and Barak basins
(Source: ICAR Handbook on Fisheries and Aquaculture, 2006) |