Dark Cloud will allow you to fish at several locations around the world.  You must have the fishing rod (which is obtained during the event in Alnet's house in Norune Village), and have some bait in inventory.  Bait can be found in chests, stolen or dropped from enemies, or bought in shops.  By catching fish, you earn fishing points, or FP, which can be traded for items and weapons.  These items can be used or, if you prefer, sold.  For instance, you can trade FP for status  removal items, and then sell them at a nearby shop.  You can get Holy Water for 5 FP, and sell it for 60 gold, which can make you quite a bit of money if you are patient.  However, if you don't enjoy fishing, this wouldn't be a recommended method of making money. 

To fish, approach the sign by the body of water, and press X when the ! appears over Toan's head.  You can choose to fish, exchange FP, view your fishing log, or quit fishing.  If you choose to fish, you will get further options.  Press X to cast, □ to change bait, or ○ to quit.  Below these options, it will tell what bait you have equipped.  Make sure that you have the desired bait on your line, and you're ready to cast.  Fish will sometimes nibble at the bait, and if this happens enough, you can lose the bait.  Make sure that you have vibration turned on so you can feel the fish eating at the bait.  Once a fish pulls the bobber below the surface of the water, press X to pull it in.  You will see the fish you caught and how long it is, and that information will be recorded in your fishing log.  You will also learn how many fishing points you have earned.

The following are the locations where you will be able to fish in Dark Cloud:

Village	Location
Norune Village	Pond
Matataki Village	Peanut Pond and by waterfall
Queens	By dock near Rando's shop
Muska Lacka	Oasis

These are the types of bait in the game, and the types of fish that seem to like them:

Bait	Fish	Location
Batton	Nonky	Matataki Village
	Negie	Muska Lacka
	Tarton	Matataki Village
Bomb Nuts	Niler	Norune Village
	Nonky	Matataki Village
	Nonky	Norune Village
	Negie	Muska Lacka
Carrot	Gummy	Matataki Village
	Umadakara	Matataki Village
Evy	Kaji	Queens
	Piccoly	Queens
Gooey Peach	Nonky	Norune Village
	Nonky	Matataki Village
	Negie	Muska Lacka
Mellow Banana	Negie	Muska Lacka
	Gobbler	Norune Village
	Gummy	Norune Village
Mimi	Gummy	Matataki Village
Minon	Niler	Norune Village
	Nonky	Norune Village
	Nonky	Matataki Village
	Negie	Muska Lacka
	Tarton	Matataki Village
Petite Fish	Baku Baku	Matataki Village
	Hama Hama	Queens
	Heela	Muska Lacka
Poisonous Apple	Mardan Garyan	Muska Lacka (fish in the evening)
Potato Cake	Gummy	Norune Village
	Nonky	Matataki Villlage
	Den	Muska Lacka
	Baron Garayan	Muska Lacka
Prickly	Gummy	Norune Village
	Gummy	Matataki Village
	Gobbler	Norune Village
Throbbing Cherry	Gummy	Norune Village
	Nonky	Matataki Village
	Den	Muska Lacka
	Negie	Muska Lacka

When you decide you are through fishing, you can exchange fishing points, if you would like to.  The following is a list of the items and weapons that are available through trading fishing points:

Item	FP
Antidote Drink	5
Holy Water	5
Soap	5
Mighty Healing	15
Dragon Slayer	50
Undead Buster	50
Sea Killer	50
Stone Breaker	50
Plant Buster	50
Beast Buster	50
Sky Hunter	50
Metal Breaker	50
Mimic Breaker	50
Mage Slayer	50
Garnet	100
Amethyst	100
Aquamarine	100
Diamond	100
Emerald	100
Pearl	100
Ruby	100
Peridot	100
Sapphire	100
Opal	100
Topaz	100
Turquoise	100
Tsukikage	1100
Matador	1400
Magical Hammer	1800
Fairy's Ring	1300
Scorpion	1400
Blessing Gun	1500