The Snakeheads belongs to a highly diverse group of fish is and most of the commonly found species like the Asian Snakeheads originate from the rivers in that locality especially in Vietnam and Indonesia. They all share one common appearance which can be easily recognized with all of them have a very elongated body and posses quite a nasty and ugly head. One quick glance will tell you that it is a very ferocious species waiting to pounce on meat as it has a set of very sharp teeth. Other than that, the fish also has a labyrinth organ that allows it to breathe normal air (just like gourami) so that it can survive in low oxygen level water condition and that makes it an efficient hunting and killing machine. With this ability it will allow the fish to actually survive in mud waters especially in ponds and paddy field and devour other species that comes in its wake. African clawed frogs being one their favorite foods.
The snakeheads are also being hunted themselves and while most Asian people would serve them on dinner table just like tilapia, most American and European counterparts will keep them as pets. Even nowadays, you can even find the snakeheads escaping into natural territory up to the extent of establishing a stable population there. Their presence has been blamed to be the cause of disappearance of native species and that has led to governments around the world enacting laws that ban the sale and keeping the fish as pets in home aquarium.
Snakeheads will accept any food that you throw to them whether it is flakes, dry pellets and they love constant feed of live fish including invertebrates like fiddler crabs introduced into the aquarium so that they can chase and devour after it alive. If well fed, they have a very fast growth rate with certain species like the Giant Snakeheads able to achieve growth rate of about 1 inch every week and they can attain maximum length of more than 3 feet. With that being said, even a normal 100-gallon fish tank will not be enough and you will need at least 1000-gallon minimum for them to properly grow and survive.
There are even reports of fishing groups capturing live snakehead fish in the wild measuring more than twice the size. Nevertheless, regardless of how fun it is to keep the fish as pets, I really don’t like the idea of having something swimming in the aquarium that will eat almost anything and that includes your finger!