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Eel
Eel
The European conger is the heaviest of all eels.
The European conger is the heaviest of all eels.
Eel eggs hatch firstly into the leptocephalus larval stage.
Eel eggs hatch firstly into the leptocephalus larval stage.
Larval eels become glass eels as they transition from the ocean to fresh water.
Larval eels become glass eels as they transition from the ocean to fresh water.
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Actinopterygii
Actinopterygii
Anatomy of a typical ray-finned fish (cichlid) A: dorsal fin, B: fin rays, C: lateral line, D: kidney, E: swim bladder, F: Weberian apparatus, G: inne
Anatomy of a typical ray-finned fish (cichlid) A: dorsal fin, B: fin rays, C: lateral line, D: kidney, E: swim bladder, F: Weberian apparatus, G: inner ear, H: brain, I: nostrils, L: eye, M: gills, N: heart, O: stomach, P: gall bladder, Q: spleen, R: internal sex organs (ovaries or testes), S: ventral fins, T: spine, U: anal fin, V: tail (caudal fin). Possible other parts not shown: barbels, adipose fin, external genitalia (gonopodium)
Tuna are streamlined for straight line speed with a deeply forked tail
Tuna are streamlined for straight line speed with a deeply forked tail
Cod have three dorsal and two anal fins, which give them great maneuverability
Cod have three dorsal and two anal fins, which give them great maneuverability