They have a lot, but they have too many variables: age, size, weight. genetics... there is no straight forward answer to your question.
Well the one i know has spikes is the porcupine i think porcupine fish but i know if there is anymore. :-]
porcupine
Point their spikes out!
A porcupine uses the spikes on its back to protect itself.
Hedgehog or porcupine.
It's spikes
Yes porcupine fish do have fur
The correct spelling is "porcupine." It is a large rodent with spikes or quills on its back for protection.
No, Sharks will not eat porcupine fish.
Its spikes, called quills ; this defensive adaptation protects the docile porcupine from predators.
The color of the porcupine fish can range from olive to brown. This fish has a light underbelly and dark spots cover its entire body. A porcupine fish is a pufferfish.
by drinking river water and using it spikes to live