i dont see why you would suddenly decide to release 50+ snakeheads in the wild, if you breed them surely its a cheap source of food for the adults if not sell em.... they are what some where around 6-12" at a guess so yeah they would have a rough time being released at night, stress in new waters, if it where a game lake probaly asume there are big predatory cat, larger sh and other big asain preds in there, and just as much danger in the wild to be fair tho prehaps a higher consentration of danger in a game lake?