Most of the slips for catches landed by set net fishery describe the number of boxes every catch shipped in Japan. The number of the catches contained in each box (“irisū”) depends on the species. Furthermore, even among the same species, the “irisū” may change depending on the season. In this study, under the cooperation of fishermen, with reference to their catch slips, the abundance by species of the catches landed was estimated by researching the contents of the boxes in Nago, Abu Town, Yamaguchi Prefecture, Japan, 2014. The number of operation days was 206, which amounted to the monthly average number of operation days of 17.2 ± 3.4 (average ± SD). The number of species shipped in the same year amounted to 61 with the monthly average of 22.8 ± 5.8. We interviewed fishermen to get the relationship between the species or fishes whose brand names may change depending on the season and the respective “irisū”. Based on the results of the interview, the total abundance of catches landed (exclude “iromono” boxes to be shipped with some different fish species) was estimated to 218,543 and the average abundance shipped per operation day amounted to 943.3 ± 1297.9.