1) The swimming place of little carp, Cyprinus carpio, was studied in a shallow tank (90cm long, 70cm wide and 10cm deep). See Fig. 1. 2) Each of the three groups respectively consisting of 1, 2 and 10 individuals was tested for an hour. The momentary horizontal distribution of these fishes in the tank was recorded every one minute. 3) The distribution of every fish by section is shown in Tables 1, 4 and 7; the total amount in Tables 2, 5 and 8; and the number of fish distributed in the corner, by the side and in the center, in Tables 3, 6 and 9. 4) From those results (Tables 3, 6 and 9), it is manifest that carp are more often found by the side of the tank than in the center. 5) It is most likely that little carp rather have an inclination to swim along some object in the water
