Fish Joke for Monday-itis: Hot. Posted on 2014/03/092013/09/22 by TheFishVet - Richmond's School of Fish Q: When it gets hot, what do fish use to keep cool? A: A fin. Share this: Share on Facebook (Opens in new window) Facebook Share on X (Opens in new window) X Share on LinkedIn (Opens in new window) LinkedIn Email a link to a friend (Opens in new window) Email Print (Opens in new window) Print Like Loading... Published by TheFishVet - Richmond's School of Fish Aquatic veterinary medicine, pathology and educational services for fish. A repository for useful information and events. View all posts by TheFishVet - Richmond's School of Fish