Adoption and economics of silver barb (Puntius gonionotus) culture in seasonal waters in Bangladesh.
Hundreds of thousands of seasonal ponds and ditches in rural Bangladesh are mostly derelict or underutilized, due to lack of appropriate aquaculture technologies. On-station and on-farm research undertaken by the Fisheries Research Institute resulted in development of management practices for culture of silver barb (Puntius gonionotus) which can be grown to market size in short periods in such waters. For farmers adopting the new production practice, fish production varied from 772 kg per ha after three months rearing, to 1568 kg per ha after eight months. Adoption of the technology by farmers resulted in an increase of fish production by 74%. Of total fish production, 54% was consumed by households and given away, the remainder being sold. Revenue from 30% of the fish produced was enough to meet the cost of production, indicating economic viability and sustainability of the operation. Ninety-one percent of the farmers expressed satisfaction with the technology, and 33% were in favour of expanding operations. Rapid growth, low investment and simple technology were perceived as being the most important encouraging factors for the adoption of the technology, whereas non-availability of credit for inputs, inadequate supply of fingerlings and small pond size were perceived as constraints to expansion.