Shoot single fish: If you are a new player, you should choose fish with slow swimming speed, walk alone, and try to shoot at the head to finish and limit the cost of coins.
Shoot at schools of fish: In the levels, schools of fish will appear. At this point, you only need to choose about 4-6 bullets to shoot. Note that you should shoot in the middle and avoid the big fish in the school.
Shoot big fish: You need to accumulate a large amount of coins to shoot big fish, these fish will bring you a lot of rewards. However, the amount of coins to shoot these fish is usually a lot, so you should choose to shoot when you have accumulated a lot of coins and try to hit the head.