Spatial variation in life history characteristics of common megrim (Lepidorhombus whiffiagonis) on the Northern Shelf

► Spatial differences in megrim life history characteristics on the Northern Shelf. ► Protracted spawning season in the northern North Sea. ► Sex ratio and length at first maturity differ between the North Sea and Rockall. ► Female growth rates in the North Sea are greater than at Rockall. ► These results support recent changes to stock structure on Northern Shelf.