The dolphins don't either, most of the time.
Whales, piranha, seagulls and Neptune won't hurt you there. When you set your boat to the side where you drop of your fish, you are safe from some enemies. Swordfish slice your line, whales blow water which throw you in the air, seagulls drop bricks and get a leak in your boat, Neptune throws spears, dolphins jump on your boat and knock you out, sharks take the bate and knock you out by swimming fast to the side and electric eels electrify you. Piranha-like fish jump on your head, you lose points. The animals try to stop you from earning points.
You enter a fishing contest and your real goal is to reach Platinum for all lakes. No stories for fishers The storyline is poor.