"Necton" is a category name for Things That Swim, as "plankton" is one for Things That Float and "benthon" for Things That Crawl Around On The Bottom, so any thing, mostly a fish-thing, but also some mammals and reptiles that swim which is big enough to eat an octopus is likely to do so.
people and other octopuses
Usually octopuses eat crabs, clams and some other fishes too.
Octopuses eat shrimp, lobsters, crabs, snails and sometimes fish and other octopuses. Most octopuses hunt at night when their pray is sleeping.
no
yes
they dont
the like to eat clams
Sure, they can.
its a carnivore, they eat fish, octopuses, and crustaceans.
Octopuses eat pretty much whatever they like. They may not target clownfish but they will eat them if they want.
sometimes octopuses eat sharks
yes!