Manta Ray sells the most, but sharks over-all are best for making money.
There are several ways to get money; you might do mining and sell the ores, or do woodcutting and sell the logs, or go fishing and sell the fish.
no you can not sell your house on runescape.
If you area mem, you can sell raw fish, kill dragons and sell the things that they drop. If you are not a mem, you can sell raw swordfish and lobsters. Also, you can sell the bones from lessers.
Most general stores sell them.
Blue partyhat costing 2100M
The same place where you can buy and sell most things - the Grand Exchange or by an exchange with other players.
If you sell them raw. however if you cook the fish you catch and then sell it brings down the value considerably. Just to clarify you are referring to Runescape right?
The best way to fish on runescape is to use a net or a fishing rod and bait in draynor. Then it is easy to bank your fish
No, Your RuneScape House is based on your Construction Level.
You can sell them to players but there is no shop in runescape that sells or buys tiras.
The same as coins. The standard currency, used to buy and sell most items.
No.