Are there signs to look at a sea creature that warns that it is not edible and must be avoided?
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Like others mentioned, typically by experience.
One rough rule of thumb is that if it is highly colorful with lots of patterns, chances are it is poisonous. This is something known as aposematism – certain species develop these bright colors and patterns as a defense mechanism to warn predators. (There are many exceptions of course, with some colorful species being delicious while other innocent-looking ones are highly poisonous. Best to avoid eating random things from the ocean if you don’t know what they are.)
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