Dhaka, Oct. 30 -- The Sundarbans' waterways are showing a mixed picture: at least six fish and aquatic species are declining, while nine are on the rise. A two-year assessment has mapped their changing fortunes, warning that illegal fishing, the capture of juveniles and environmental pressures threaten the mangrove forest's aquatic wealth.

The findings offer a detailed snapshot of pressures beneath the forest's surface.

Researchers say the overall picture remains broadly stable, with increased freshwater flow helping some species. But they are urging tighter controls on catches and fishing methods to prevent vulnerable stocks from dwindling further.

The study, Assessment of Aquatic Resources of the Sundarbans, was led by M Enamul Haque...