Forktongue gobies are small fish that live on rocky shores all over Japan. On the shore, they seem to feed on small organisms in the water, such as planktons and amphipods. However, when they are kept in an aquarium, they start to eat artificial
feed floating on the surface of the water. We can use this feeding behavior to see if the goby copies its neighboring goby. We are currently conducting various experiments using the gobies that have started feeding on the surface of
the water and the gobies that have just been collected from the shore. The video shows the process from the goby being collected to feeding on the water surface.