Raw rainbow fish

Raw Rainbow Fish is a members-only item on the OSRS Grand Exchange in the weapons category.

In-game examine text: "A colourful fish, attracted to colourful flies."

It has a Grand Exchange buy limit of 13,000 every four hours, a high alchemy value of 72 gp, and item ID 10138.

View on OSRS Wiki

Raw Rainbow Fish shows an active flip setup with a margin of +8 gp and 140,468 trades over the last 24 hours.

At the buy limit of 13,000 every four hours, max profit per cycle is about 104.0k gp — high margin with healthy liquidity.