they suck in water and puff up with spikes.
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The fish you are referring to is likely the pufferfish. When threatened, pufferfish can inflate their bodies with water or air to appear bigger and deter predators. They have spines on their skin that lay flat when not inflated but become prominent when they puff up.
24 spikes
There were probably 4 spikes.
7 spikes
a pufferfish is 2 feet
Mbu pufferfish was created in 1899.
6 on the front and none on the back. if you have cross country spikes then there are 4 on the back
you can buy spikes from many sporting stores like insport.
Green pufferfish was created in 1822.
Dwarf pufferfish was created in 1941.