Watch: How Does a Dead Fish Swim Upstream?

Take a quick look at this trout swimming upstream. Notice anything unusual? Image credit:Beal, et al.Passive propulsion in vortex wakes.Journal of Fluid Mechanics You've probably seen something similar countless times; the fish wriggles against the currents that push it backwards, slowly making headway until it turns and ducks out of the influence of the stream. Nothing special in that.The only thing is, this particular fish is dead.Yes, you read that right. No matter how lifelike it looks as it...