If you mean the swordfish hanging from the ceiling, you throw the bullwhip at it. To get the bullwhip complete all the "dust collectings " in the areas that are purple on the map.
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you go to miscelanoius, and there are three fish aquariums in it. choose one, and set it down.
Hold down the B button or X button then move the cursor to the water make sure your casting at least 5 meters away wait until your hook gets close to a fish then hold left or right on the control stick to make the fish notice the hook then it will snap on quickly hold down and the A button now you have the fish hooked keep holding down and the A button until you catch it watch your meter on your right don't let it hit the top or you will lose the fish and a life.
you put a grenade down its throat
The last fish, the coelacanth is a rare fish, but catchable. It is found in the ocean, when it is raining or snowing. It must also be from 4pm to 9am. Its about the size of a tuna, and is easy to catch after you find it. Don't be down if you can't find it!
All you do is: near the end but before the big fish there is a whirlpool with blocks beside it. Wait until the whirl pool is down then go down the hole and when you go down it is right there.