Very little. The only thing is they both live in water and have vertabrea. A dolphin is a mammal and nurses its offspring. Fish either lay eggs or give birth to live babies and don't produce milk for them.
Dolphins are warm blooded; fish are cold-blooded.
There aren't many similaritys between fish and dolphins other than there both aquatic animals, and they are both vertebrates.
The are both aquatic animals, one fish and one mammal. Actually there is also a fish called "dolphin" or Dorado or several other names around the World.
They live in water
They have a streamlined shape for swimming
They have fins
The are both vertebrates (have a skeleton and spine) <
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