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Coffee cans or masonry jars tied 10 ft apart on a line. Lay it on the bottom and check 24 hours later. We had an old Portuguese neighbor on Hood Canal that use to fish for octopus this way. To kill them he would bit them between the eyes.
The two times we went with him, the octopus stayed put in the cans.
Okay....regs say with hands or instrument that does not pierce the skin EXCEPT that octo taken while angling may be retained. Fish away!