Just in case you’ve ever wondered how you would go about anesthetizing an octopus (and I’m sure that most of you have) you can do so by immersing your octopus in seawater that has had isoflurane added to it:
In a study published online this month in the Journal of Aquatic Animal Health, researchers report immersing 10 specimens of the common octopus (Octopus vulgaris) in seawater with isoflurane, an anesthetic used in humans. They gradually increased the concentration of the substance from 0.5% to 2%. The investigators found that the animals lost the ability to respond to touch and their color paled, which means that their normal motor coordination of color regulation by the brain was lost, concluding that the animals were indeed anesthetized.
I do not at this time plan on testing this with my cephalopods but it’s good to know.