Nik Mohd Rahimi, who manages Fly Fishing and Lure Casting Centre in Taman Pertanian Bukit Cahaya in Shah Alam, said that it got into the Perak waterways by accident.

"Some breeders were keeping it in a pond, and one rainy season, the pond overflowed, and that's how it got into the river system."

Nik Mohd said there was once a demand for the peacock bass as an aquarium fish, but owners soon found them troublesome to be kept as pets.

"It would eat the whole time, resulting in a lot of waste. After some time, the owners got fed up of having to clean the aquarium all the time and just dumped them into the waterways, increasing their numbers in the rivers."

He said although the fish has yet to make its way to Malaysian dinner tables in a big way, anglers and diners in Batu Gajah were creating a demand for it.

"You can get it in Batu Gajah for RM5 to RM7 per kg," he said.

Nik Mohd said he did not like the taste of the fish when he first ate it in 2001 but had since developed an immense liking for it.

"About 10 years ago, when we first caught it, it was a few hours later before we took it to a restaurant to get it cooked.

"It was horrible because the flesh turns pinkish if you don't cook it immediately. However, the kids just loved it deep-fried and with soy sauce on it."

He said the bigger ones were best eaten steamed, but advised not to eat the skin as it had a very strong smell.

"The flesh is juicy and tender, like the cod fish. The bones and head are usually used as stock for Chinese herbal soups," Nik Mohd said.

In South America, it is a delicacy, where the fish is grilled with salt wrapped in banana leaf.