India, Aug. 6 -- The Upper Yamuna River Board (UYRB) has asked Delhi, Haryana and Uttar Pradesh to develop "fish ladders" at the Wazirabad, Okhla and Hathnikund barrages to facilitate the migration of native fish species, during a meeting on Tuesday, a senior official said on Wednesday.

A fish ladder is a stepped water structure that helps fish bypass obstacles such as dams and barrages during their upstream migration. "All basin states have been asked to develop fish ladders on barrages under their control. This is likely to help movement of fishes especially during the monsoon when the river is less polluted," said the official, who did not wish to be named.

Three different states oversee all three barrages located in Delhi. "Delhi on...