Raw Spotted Yellowtail

About 18c on Beta · Horde (38 minutes ago), 16c on Beta · Alliance (54 minutes ago), and 4c on Beta · Alliance (4 hours ago), from player scans. A vendor pays 4c, so the auction house pays 4.3× more.

2 recipes: Spotted Yellowtail and Specklefin Feast.

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 42c there, against 80c at a vendor.