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Is an octopus considered a fish?

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Nope. Taxonomically, both are in the Animal Kingdom, but that's where they diverge. Fish are in the Phylum Chordata (more or less having a spinal cord). Octopi, or pus-fellers as Quarrel called them, are mollusks - no backbone, inter alia. Culinarily, prepping fish vs octopus is very different. read more

Culinarily, prepping fish vs octopus is very different. Once you have them prepped (which includes simmering octopus a good long time to tenderize it), you can cook them in some of the same ways - grilled/broiled, in ceviche, etc. read more

The other main reason why they are not considered fish is because all fish are vertebrates. All mollusks, including octopuses, are invertebrates. They evolved separately from fish long ago. read more

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Keeping an Octopus in an Aquarium
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