Is it a keeper? A yellowfin tuna is a keeper today if it measures at least 27 inches, with a daily limit of 3.
Yellowfin Tuna size limit, season and daily limit
Where
Season
Size limit
Daily limit
State waters
Open year-round
27 inch minimum
3 per person per day
Notes
Curved fork length.
Atlantic HMS Angling Permit required for private vessels in federal waters; non-retained HMS must be released without removing from the water. hmspermits.noaa.gov / (888) 872-8862.
Exact DNREC wording
Season
Open Year-RoundAll Atlantic Highly Migratory Species (Atlantic tunas, sharks, swordfish and billfish) not retained must be immediately released to ensure the maximum probability of survival, without removing the fish from the water.*Special permit required - All private vessel owners/operators recreationally fishing for and/or retaining regulated Atlantic Highly Migratory Shark Species for personal use in Federal waters of the Atlantic Ocean (3 to 200 miles off shore) must obtain an Atlantic Highly Migratory Species (HMS) Angling Permit. Consult https://hmspermits.noaa.gov/ or call toll free (888) 872-8862 for specific information and permits.
Size
27 inch minimum (measurement is taken in a line, tracing the contour of the body from the tip of the upper jaw to the fork of the tail, which crosses the dorsal insertion of the pectoral fin and the dorsal side of the caudal keel)