To get fish pets you have to have level 73 summoning. Locate fish eggs in submerged caves or RuneScape gold someplace, (should have level 73 summoning) if you find a shark puppy, then you're extremely fortunate. If you take more than one egg you can only get one fish. Set the egg in it and wait until you've got a fish (you can not place the shark pup in it.) You may have (from rarest to least rarest) Sharks (rarest): They're the best helper in underwater fishing. They help you catch fish submerged quicker based on the stage. Stages are pup (there isn't shark eggs), juvenile afterward mature. The next is the Angler Fish. It is the only source for lighting in dark underwater cave, even as candles or lanterns would go out. They have three stages, egg, larvae and then adult. You need to incubate the egg. Pufferfish will be the next. Their eggs are located on the surface of the water that you may access from scaling up the anchor . Climb up it to visit Captain Murk. Receive a pufferfish egg and then incubate it. It will hatch soon. The most common fish would be that the salmon. They help you find eggs. Whenever you're in 10 squares of eggs, it will swim in circles. All fish need to keep underwater. You can't head from the water following you or in your inventory. You may have just one fish at one time even when the fish is with the tamer. Why you can't put them in the bank either is since you have to give them to the Fish Tamer. You can also have a house underwater in Mogrin. Your dungeon will be temporarily removed until you transfer your house to a location that isn't underwater. Having a home in Mogrin unlocks a brand new feature for your PoH. When you are in Mogrin you can add an aquarium to your PoH. If you move your property, it will still be there and you'll be able to update your aquarium objects but buy OSRS gold you can't make another aquarium until you return to Mogrin.