A dead dolphin was found in the Halda River in Hathazari upazila of Chattogram on Tuesday.
Local people spotted the carcass of a dolphin in the river near Chankhali Bridge at noon, said Hathazari upazila nirbahi officer Ruhul Amin, reports UNB.
Prof Manjurul Kibria, coordinator of the Halda River Research Laboratory of Chittagong University, said the 7.5-foot-long dolphin has no injury mark in its body.
"It seems the dolphin has died of natural causes," he said.
With this one, 29 dolphins were found dead in the river in the past four years, said sources at the local administration.