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Small indigenous fish species of Bangladesh - potential for culture and conservation.

Abstract
 The possibilities of conservation and production potential of a large number of small indigenous fish of Bangladesh through aquaculture remains unexplored. Only a small number of carps has been used for polyculture throughout the country which provide employment for a large number of people in the domestic fish marketing chain as farmers, traders, intermediaries, day labourers and transporters. Special attention is needed for the culture and conservation of small indigenous species (SIS) because they are an important source of vitamin A and minerals. SIS used to be abundant in rivers, streams, beels (deeper portions in low-lying natural depressions), ponds, ditches and flood plains in the past, but have gradually been disappearing from natural systems, which in turn severely affects biodiversity.