At present, there are no octopuses that can live in fresh water, because octopuses all live in seawater now. They belong to temperate mollusks, like to live in gravel areas on the seabed, and sometimes hide in crevices. If octopuses are cultured directly in fresh water, they are likely to die because they do not adapt to the fresh water environment. Although there are some freshwater octopuses that can live in fresh water for a short time, they cannot live in fresh water for a long time. So at present, there is no octopus that can live completely in fresh water.

Octopus can't be fed directly with fresh water, because they live in seawater, and the salt content of fresh water is too low. If octopus is put in fresh water, they may dehydrate and die.

If you want to raise octopus with fresh water, you can add some sea salt or seawater essence to the fresh water, so that the salt content in the water is high and the octopus can live normally. In addition, octopuses need more oxygen. When they are cultured in fresh water, they need to be continuously oxygenated to avoid their lack of oxygen. Moreover, the food fed is preferably marine life or special food, so that they can grow normally.