Measuring Fish

Use these guidelines to measure fish correctly:

1. Place the fish on its side on a flat board with the jaw closed.

2. Squeeze the tail fin together or turn it in a way to obtain the maximum overall length.

3. For species with total length requirements, measure in a straight line from the tip of the snout to the extreme tip of the tail fin.

4. For species with fork length requirements, measure in a straight line from the tip of the snout to the fork of the tail.

5. For species with lower jaw fork length requirements, measure in a straight line from the tip of the lower jaw to the fork of the tail.

In federal waters:

6. For species with curved fork length requirements, measure from the tip of the upper jaw to fork of  tail along the contour of the middle of the body.

7. For species with carcass length requirements, measure curve from posterior edge of gill opening to anterior portion of caudal keel.

For complete requirements regarding the taking of fish in federal waters obtain a Recreational Fishing Regulations for Gulf of Mexico Federal Waters pamphlet from the Gulf of Mexico Fishery Management Council, The Commons at Rivergate, 3018 U.S. Hwy. 301 N, Suite 1000, Tampa, Florida 33619-2266; 813-228-2815, toll free 1-888-833-1844; e-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it ; webpage: www.gulfcouncil.org.

This information is graciously provided by The Louisiana Department of Wildlife & Fisheries.