The only octopus i know if thats poisonous is the blue ring octopus. They arent the ones you eat. Still though if the acids in your stomach killed the octopus(which it does) the poisons would still be released into your body. I think you may be mixing up octopus with puffer fish.
@answerman1980 ive had sea urchin a couple times now, i didnt really like it, not a great taste or texture for that matter.
Salmon Roe on the other hand YUM its like salmon flavored icebreakers lol.
EDIT: allie i also forgot to add that a lot of the time when people eat “live” octopus it isnt really alive just chopped up but it can remain to move for 3 hours after its death. This is the same kind of octopus that people eat whole, so its not a poison issue.
RE-EDIT : watch