Which one of the following is not a true fish?

Q. Which one of the following is not a true fish?
Answer: Starfish
Notes: Although sea stars (star fish) are benthoic i.e. live underwater and are commonly called "starfish," yet they are not fish. They belong to phylum Echinodermata whose members are exclusively marine and benthsoc with great power of repeneration are characterized by water vascular system.

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