State media report in China report that about 100 tonnes of poisoned fish have been removed from a river in central Hubei province.
Xinhua news agency said the fish died after a chemical factory discharged ammonia into the Fuhe river and the company had been ordered to suspend operations.
Xinhua reported that sampling of a drain outlet at the Hubei Shuanghuan Science and Technology Stock Co showed that ammonia density far exceeded the national standard.
The BBC reports that more than 16,000 dead pigs were recovered earlier this year from a river that runs through Shanghai.
