If you ever have a chance to go on a backstage tour of an aquarium, take a look at the setup for the octopus tank. You should notice that there are series of interlocking padlocks across the top. When left to their own devices, octopuses are likely to sneak out and rummage through the aquarium after hours (true story).
Many aquariums around the country work with their local fishing communities to rescue any octopuses that become trapped in fishing nets. Octopuses are then nursed back to health before being released back into the wild. You can get involved by contacting your local aquarium or marine life center.