The people that seem to think they know what they're talking about should also learn the law. As natural as this may seem, it isn't. I have never seen a pond the size of a jar with both of these animals inside and this video is why. As for people believing this is hunting, the fish was put directly infront of that horrible looking bug, so in a sence that is like giving it a ready made meal.
To conclude, why the fuck would you keep somethin like that!