sentence: their size varies between subspecies : the baltic herring ( clupea harengus membras ) is small , 14 to 18 centimeters ; the proper atlantic herring ( c. h. harengus ) can grow to about 46 cm ( 18 inches ) and weigh up 700 g ( 1.5 pound ) ; and pacific herring grow to about 38 cm ( 15 inches ) .