The guy on the picture is probably choking judging the dilating eye pupils and the gill flaps being blood red from trying to extract oxygen from the air, but fear not, there's a solution.
If you squeeze his hog really hard and manage to give him an orgasm, he will secrete a mucus from a pair of glands located in his esophagus that will isolate his gills, moisturizing them in the process. After that is the usual post-nut clarity but then he will return to normal and he can now breathe air without the aid of a body of water for about six to seven hours.
WARNING: continued use of this practice whilst on dry land will lead to hypoxia and other brain damaging side effects, and ultimately death from asphyxiation and lack of oxygen circulating in your brain. Do not attempt to do it more than once.

How do I know that? A nurse or two gave me that advice, if you know what I mean.