Raw Nightfin Snapper

About 55c on Beta · Horde (6 hours ago) and 3s 0c on Beta · Alliance (8 hours ago), from player scans. A vendor pays 10c, so the auction house pays 5.2× more.

1 recipe: Nightfin Soup.

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 10s 45c there, against 2s 0c at a vendor.