look here: http://runescape.wikia.com/wiki/Big_net
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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
Anywhere you can net fish, you can bait fish with a fishing rod, too. That includes the Lumby swamp (at the river), Draynor (at the ocean), Karamaja (on the docks), and the Lumby Pond.
Use a Butterfly Net or a Magic Butterfly net.
There is no big dye in Runescape.
A Big bass is a very rare fish which you stand a very low chance of catching whilst fishing regular Bass. Big bass is not tradeable and has no use apart from being stuffed and mounted in your house.