scale of rudd for age determination

actinopterygii age angling animal aquatic background bird bottom branch catch countershading creature cyprinid cyprinidae determination drink encounter european fauna feeding fin fish fisheries fishing flower fluviatilis food fresh freshwater grass green grow hand hard hearing individual isolated lake leaf life living material mineral nature otolith otoliths perca perch plant produce reflection rock rudd scale science sense skin soil stone stones structures submerged swim tench tinca tree vegetation water wildlife wood