I worked as an intern at a lab studying octopus vulgaris.
They are extremely sensitive to all sorts of things in the water. Keeping them well is very difficult. Although I would imagine if there are big but gradual changes in water environment, they would have a chance of adapting faster due to short life cycles and the fact that mating creates hundreds of thousands of eggs.
I mean that’s biology. We can do some pretty cool stuff, but we just don’t understand how so much in the human body works. It’s so fucking complex.