8!, oh wait, they were mum to the condition in which the fish need be, 10! In all honesty, fish can drown, just need a liquid for them to get trapped in that does not allow free passage / diffusion of oxygen throughout it, or complicates the fishes's act of respiration ( water is not the only liquid ) ( respiration also does not solely refer to gas processing lungs, can refer to gills, and cells too ) I am here to mess with peoples minds, no more, no less...