What is the average size for a herring?

Herrings typically range in size from 15 to 45 cm (6 to 18 inches) in length, although some species can grow larger. The Pacific herring (Clupea pallasi) is one of the largest species, reaching an average length of 30 cm (12 inches) and a maximum length of 45 cm (18 inches). The Atlantic herring (Clupea harengus) is also a large species, with an average length of 25 cm (10 inches) and a maximum length of 45 cm (18 inches). The European sprat (Sprattus sprattus) is a smaller species, with an average length of 15 cm (6 inches) and a maximum length of 25 cm (10 inches).