Country Trailhead

Field Guide / Saltwater Fish

Gag Grouper

Mycteroperca microlepis

Also called: gag, grouper

A heavy, gray-brown reef predator of the Gulf and South Atlantic, strong and quick to dive into rocks and holes.

Illustration of a heavy gray-brown fish in side view with darker worm-like markings and a large mouth
AI-generated illustration for general reference. Fish vary in color and markings with age, location, and water, so check the identification tips below rather than relying on one picture.
Type
Bottom & Reef Fish
Typical size
5 to 20 lb; fish over 30 lb are large
Range
The Gulf of Mexico and the Atlantic coast from the Carolinas south
Coasts
Southeast Atlantic, Gulf of Mexico
Where
Reefs, wrecks & jetties, Open water
Best seasons
Seasons vary; inshore in summer for some fish, offshore in winter

Note: Grouper rules include seasons, size limits, and closed areas that change often. Size limits, bag limits, and seasons for this species change often, so check current state and federal rules before you keep one.

How to identify it

  • A gray-brown body with darker, worm-like marks on the sides.
  • A large mouth with a projecting lower jaw.
  • A tail with a slightly concave edge.
  • A thick, heavy body.

Often confused with

  • Red Snapper: reddish and thinner, with a pointed anal fin.

Baits and lures

  • Live pinfish, grunts, and cigar minnows
  • Large cut bait
  • Trolled deep-diving plugs

Techniques

  • Drop a live bait to a ledge or wreck and hold the fish out of the rocks.
  • Troll deep plugs over reefs and ledges.
  • Use heavy tackle, since groupers dive into holes.
  • Use a descending device for released fish.

Field notes

Gag grouper change sex as they grow, and the large fish are usually males. Strict rules help keep populations healthy.

Related guides

Saltwater size limits, bag limits, seasons, gear rules, and license requirements change often and differ by state and in federal waters. Some species are catch-and-release only or closed in certain areas. Check your state's current fishing regulations before you keep a fish; our state resources directory links to each state's official wildlife and fisheries agency.

← All saltwater fish