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The bottom fin at the back of the fish iscalled the anal fin. The tail fin iscalled the caudal fin. Pectoral and pelvicfins come in pairs.
Besides, what's the tail fin of a fish called?
caudal fin
Correspondingly, do fish have tails or fins?
Apart from the tail or caudal fin, finshave no direct connection with the spine and are supported bymuscles only. Their principal function is to help the fishswim. In bony fish, most fins may have spinesor rays.
Thetail or caudal fin is the only fin attached directly to thespinal chord of fish. Fish generally move using awave like motion of their body, the caudal tail amplifiesthe effect of this and is the main source of propulsion for manyfish.