Some fishes are more quick to react to threats which make them slightly harder to catch. You just need to let the fish eats as many as possible.
You don’t need strategy to play this game. The game is kind of repetitive but the sound of the predator gobbling the poor fishes sounds nice to the ear. There are challenges but not one of them is difficult enough to get frustrated with. When it gets bigger, it can eat other fishes which was previously impossible when it was still a small marine predator.
In this game, you control a fish whose growth spurt depends on how many fishes it eats. Feeding Frenzy is a no-brainer game to help you out of boredom.