Fig. 3 in Echinoderes landersi Grzelak & Sørensen 2022, sp. nov.

Fig. 3. The counting zone: (a) A commercial signal float (arrow, 3 m in length) was set to define the counting zone. The size of school was estimated by counting the number of fishes that passed the zone in a given time multiplied by the total time that the entire fishes took to pass the zone. (b) Some school that was not participated in the migration group. In this case the school was photographed to estimate the gross population (a dot on fish indicates the fish was counted).