המועדפים של rpillon

I saw this shell moving low though the water and followed it. After a few feet it stopped and this fish jumped off. As I watched it eventually moved back onto the shell. I looked away momentarily and when I looked back the shell was again moving through the water, about a foot above the bottom. After a few feet it again came to rest and fish again moved off it. Not sure how he was making it fly, but he must have grabbed it with his mouth.