An obsession with ornamental fish in Asia has unleashed a killer hybrid in Malaysia which is terrorising local fish in the wild, anglers claim.

The flowerhorn, an odd-looking creature with a hump on its forehead and patterns on its body resembling Chinese letters, is the focus of a major craze in Malaysia and other parts of Asia.

Depending on the size of the hump and the quality of colour and markings, the carnivorous fish can fetch thousands of dollars.

The craze for rearing the fish all started when someone claimed to have made it rich after getting his lottery numbers from the black markings on the fish’s body.