Raw mackerel

Raw Mackerel is a members-only item on the OSRS Grand Exchange in the other category.

In-game examine text: "I should try cooking this."

It has a Grand Exchange buy limit of 15,000 every four hours, a high alchemy value of 9 gp, and item ID 353.

View on OSRS Wiki

Raw Mackerel shows an active flip setup with a margin of +3.9k gp and 72,691 trades over the last 24 hours.

At the buy limit of 15,000 every four hours, max profit per cycle is about 58.02m gp — high margin with healthy liquidity.