By the way, we had "walking catfish" in Africa that would use the spines next to their dorsal fins to crawl/slither from the rivers to our fish culture ponds and then back again. They were attracted to light, so there would be nights when we'd sit on the pond banks, waiting for the ponds to drain, singing to pass the time, and we'd look over at the lanterns and find we had an ichthyo-audience. Very wierd at first, but probably the closest I've ever come to singing for my supper.