Tuna

Tuna is a free-to-play item on the OSRS Grand Exchange in the other category.

In-game examine text: "Wow, this is a big fish."

It has a Grand Exchange buy limit of 6,000 every four hours, a high alchemy value of 24 gp, and item ID 361.

View on OSRS Wiki

Tuna currently has a flip margin of +0 gp, which isn't profitable to flip right now despite 338,458 trades over the last 24 hours.

Items with negative or zero margins like this are better watched than actively flipped until the spread widens.