Two alligator gar fish have been found in a park in southern China, a newspaper reported.

The two fish, both about a metre long, were discovered on Monday in a man-made lake in Liuzhou in the Guangxi region, South China Today reported.

“I caught one, but there was also another bigger one in the water, a member of staff at the park was quoted as saying.

The alligator gar are not a native species in China, but some have been kept as pets and escaped into the wild. Some can grow to over three metres in length.

Park staff also found another 60cm-long alligator gar last year.

“At the time we thought another had slipped through the net, but we had no idea there were still two left, a park worker said.

Staff believe the fish were released into the lake by a city resident who used to keep them as pets.

The city authorities have issued a plea asking citizens not to release dangerous invasive species into the wild, otherwise they could be fined up to 10,000 yuan (US$1,500), the article said.

2017 South China Morning Post Publishers Ltd.