2015 Volume 9 Pages 1-12
Landing behavior (emerging from water) of abe-haze Mugilogobius abei fishes was observed in a test tank equipped with a slope which divides the water-body into two parts, one lager and one smaller water-body. The upper part of the slope emerges from the water forming dry ground (=land). When a number of Abe-haze fishes were put into the smaller water-body, most of them emerged promptly but some of them gradually moved into the lager water-body over the land. The movement to the lager water-body occurred more quickly when the same experiment was repeated. One individual, who seemed dominant, remained in the smaller water-body. When this individual was removed, another one remained in the smaller water-body. When the trials were repeated, the results were much the same. Such dominant individuals sometimes went back and forth in both water-bodies. It seemed that the ranking within abe-haze group becomes more clear and that the territory of the dominant individual becomes larger when the rearing period of that group becomes longer.
