Raw Mithril Head Trout

About 17c on Beta · Horde (5 hours ago), 22c on Beta · Horde (22 hours ago), and 50c on Beta · Alliance (24 hours ago), from player scans. A vendor pays 4c, so the auction house pays 4× more.

2 recipes: Fishing Rack and Mithril Head Trout.

No. It is in Classic Era too, with the same item level, vendor price and stack size.

Sell it on the auction house. After the 5% cut a stack of 20 brings about 3s 23c there, against 80c at a vendor.