Raw Spotted Yellowtail

About 3s 0c on Beta · Alliance (10 hours ago) and 4c on Beta · Horde (10 hours ago), from player scans. A vendor pays 4c, so the auction house pays 71.3× 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 57s 0c there, against 80c at a vendor.