It's said that they are closely related to oscar's I don't remember where I heard this, but they act alike in some ways. They are VERY SKILLED HUNTERS, in the ocean they stay right below the waters surface usually under a floating object waiting for prey to come close enough, but they are a very good sport fish, since they are very smart & fast. They do get pretty big i've seen & caught some around 1-10 pounds & they still get bigger.