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adult Africa anal fins Anguilla animals body bones Bony Fishes branchial breeding canal Carp cartilage Cat-fishes caudal fin Characins Chimaeras Cichlids Clupea coast colour Crossopterygii Cyclostomes Cyprinids denticles described Devonian Dipneusti Dog-fish dorsal and anal dorsal fin eggs embryo European Eel example eyes feeding female fertilisation filaments fisheries Flat-fishes fossil freshwater fishes function genera genus gills glands habits hatched head known Lamprey large number larvae lateral line layer length less living lobe lower jaw Lung-fishes Mackerel male marine membrane millimetres modified mouth movements muscles North America occur oceanic organs Ostariophysi paired pectoral fins pelvic fins Perch pharyngeal Pike plates primitive region rivers Salmon scales Selachians Shark side skin skull snout South spawning species spines structure Sturgeon subclasses Suborder superorder surface swimbladder swimming tail teeth tissue tropical Trout upper vertebral column vertebrates