This is due to the fact that it lives on a healthy diet, and it has a tendency to grow at an alarming rate. The second draw back is that it also becomes violent in rather congested places. It can grow up to 40 cm in length and can also weigh about 3 pounds.
What makes the fish unique and famous is its inclination towards versatile food. One of the unique patterns of food consumption that it tends to display is that it needs a different eatable every day, which is very parallel to the human feeding habit.
Some of the other insects that it is particularly fond of are flies and grasshoppers. In the wild, its diet includes sedentary catfish and other varieties such as, bunocephalus, rineloricaria, and ochmacanthus.
Depending on the size of the fish, you may also consider feeding it floating pellets. The floating pellets are available in various sizes and forms. A treat that would remind any Oscar of its native place is frozen bloodworms, which are actually red mosquito larvae. Sounds disgusting, but is loved by the Oscar!
The best way to feed your Oscar fish is to feed it a combination of different fish foods. Most owners suggest a meal of one type of 'live' and one type of manufactured food. Experts from the field of Ichthyology (the study of fish) comment that, this fish is the happiest in a reasonably large space and with a large and versatile diet.