50 CFR § 622.275 - Size limits.
All size limits in this section are minimum size limits unless specified otherwise. A fish not in compliance with its size limit, as specified in this section, in or from the Atlantic EEZ, may not be possessed, sold, or purchased. A fish not in compliance with its size limit must be released immediately with a minimum of harm. The operator of a vessel that fishes in the EEZ is responsible for ensuring that fish on board are in compliance with the size limits specified in this section.
(a) Dolphin in the Atlantic off Florida, Georgia, and South Carolina - 20 inches (50.8 cm), fork length.