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Porcupine fish are small,until they blow up like a beach ball!The reason they blow up is to protect itself from being eaten.They suck in water or air through it's mouth.It's bladder is full of poison.They have little spines on the outside of their body.They can also return to their normal size after their predator goes away.The puffer fish is a close relative to the porcupine fish.
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The next fish is the hagfish.It does not have a jaw or any bones.It's skin is poisones.It has lower teeth.They are like a worm a slimy discusting worm.
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The last one is the salmon.Salmon reproduce where they were born.They can change from a fresh water fish to a salt water fish.After they are a year old they travel back to where they were born and reproduce.Many salmon die after reaching their destination and the cycle starts all over again.
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