Is it a keeper? A southern flounder is a keeper today if it measures at least 15 inches, with a daily limit of 6.
Southern Flounder size limit, season and daily limit
Where
Season
Size limit
Daily limit
Back Bay and tributaries incl. Lake Tecumseh, and North Landing River and tributaries
Open year-round
15 inch minimum
6 per day
Notes
Applies only in Back Bay, Lake Tecumseh and the North Landing River system (DWR waters).
Elsewhere in Virginia tidal waters follow the VMRC summer flounder rule (4 per person; 16 in Jan-May, 17.5 in Jun-Dec).
Exact Virginia Marine Resources Commission wording
Season
Open year-round
Size
No fish less than 15 inches
Limit
6 per day
Back Bay and tributaries incl. Lake Tecumseh, and North Landing River and tributaries — as printed
“Southern Flounder - Back Bay and tributaries, including Brinson's Inlet Lake (Lake Tecumseh), and the North Landing River and its tributaries: 6 per day, no fish less than 15 inches”
Flounders are a group of flatfish species. They are demersal fish, found at the bottom of oceans around the world; some species will also enter estuaries.