dorsal fins
Fish back spines
Dorsal fins are the fins on the back of a fish or other aquatic animal, projecting upward from the spine.
Most fish have one or two dorsal fins that provide stability and prevent rolling.
In sharks, the dorsal fin cutting through the water's surface is the classic image of approaching danger.
Some species have spiny dorsal fins used defensively.
- sailfishSwift, long-billed fish
- sharkCartilaginous marine predator
- great whiteLarge predatory marine fish
- shark attackMarine predator assault
- dolphinEcholocating marine mammal
triangular · gills · erect · spines · body plan · swim bladder · keel · ichthyology · marine biology · whale · deep sea · open ocean · scales · swimming · hydrodynamics · anatomy · marlin · ray
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