More than 200 dead pigs have been retrieved from the waterways of Changzhou in Jiangsu province, local media reported on Tuesday.

As of Monday, 113 pigs had been fished from rivers in the city's Tianning district, while another 100 decomposed carcasses were found in waterways in Wujin district, the Changzhou Daily reported.

Xu Hongfei, deputy director of Changzhou Animal Inspection Bureau, said the pigs found in Tianning came from upstream on the Yangtze River, while the decomposed carcasses were probably dumped by nearby pig farmers a long time ago but only found recently.

Ear tags on some of the pigs showed they came from Jiangyin in Jiangsu province, but Xu said the tags only confirmed the birthplace of the animals and further investigation was needed to identify the origin of all carcasses.

The discoveries come just weeks after thousands of pig carcasses were found in Shanghai's Huangpu River, while in Hunan, authorities have been pulling dead pigs from the Liuyang River since Saturday, with more than 70 pigs retrieved as of Sunday.