Dynamics of the Population and Stocks of the Gangetic Major Carps from the Mymensingh Floodplains, Bangladesh

摘要

Length-based key parameters of the populations of Gangetic major carps' population, their stocks, and maximum sustainable yield were determined and compared with earlier findings. The fishery for Labeo rohita, L. calbasu, and L. gonius in the Mymensingh flood-plain wetlands are definitely in a state of over exploitation. Even the stock of L. gonius, which was being exploited more or less on optimal level in 1999, is now being overex-ploited, though marginally. In case of L. calbasu the fishing pressure appears to be high even on smaller size groups of 19-21 cm (70-100 g). The situation is worst for L. rohita where lengths at first capture, Lc value has significantly gone down. It is imperative that proper regulatory measures are taken soon to increase the mesh size of the prevailing major gears and regulate fishing. Regular supplemental stocking of closed type beels (natural depressions) and large-scale pen culture in these floodplain can help in increasing their fish production potential and stabilize their stock.