Shoot as many fish as possible before your oxygen runs out. You have eight shots per clip and will have to reload after. Points are awarded based on the speed and size of the fish. Smaller fish are worth more points than larger fish and faster fish are worth more points than slower fish. Every fish that you snipe will add a small amount of oxygen to your tank. Keep an eye out for the elusive bonus fish. They are worth four times as many points as normal fish and add two seconds to your oxygen.