No, fish can't blink. I can understand the confusion though. Awhile back, I was watching my pleco, when the same thing happened-I was sure it blinked. So I went to my favorite fish store and talked to the owner. He explained to me why it has that effect. The way the fish's eye is designed, moving it around can make it look very much like it's blinking. I've seen many of my former bottom feeders "blink" too, and it had me going for awhile!

laurita