Sadly No.
no
By fishing. Once you have the level, fish at the Barbarian Village. More advanced fish gives you more experience per unit, but it is slower to catch each fish.
The amount of experience depends on the type of fish, not on the type of net. You merely need specific equipment to get certain types of fish.
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
On the pier in Karamaja ;)
Raw fish.
From Runescape Wikia: "The Cavefish are a type of fish that can only be found in the Living Rock Caverns. The Living Rock Caverns can be found underneath the Dwarven Mine..."
There are various spots throughout all of runescape you can harpoon fish, the main ones are catherby, the fishing guild, and the island of karajama
Bass is a members only fish, only members can fish it.
Rocktail
Yes.
80+