 Head length from tip of snout to far extent of gill plate is about 4 times as large as the eye diameter, and head depth is 2.5 times as large, irrespective of the age of the fish.In bronze bream the relationship between eye size and head length changes considerably over the lifetime of the fish, being initially similar to the ratios in silver bream, but in full-grown fish the head length can be as much as 6-7 times eye width and head depth 4-5 times.The measurements are taken along lines bisecting the eye in both directions.