Aquatic animals fished by 297 operations of a set net at the Hibiki-nada Sea off Yamaguchi Prefecture, Japan, were investigated in all seasons from 2002 through 2010. A total of 410 species including 3 reptiles,1 chordate, 294 fishes (FS) and 112 invertebrates (IV) were caught. Among them, 242 FS and 100 IV were judged as rare (caught in less than 60 times), 28 FS and 8 IV as occasional(60 to 118 times), 9 FS and 2 IV as often (119 to 178 times), 8 FS and1 IV as frequent (179 to 237 times), and 7 FS and 1 IV as general (more than 237 times) species. One hundred and one (101) FS and 29 IV were caught in all seasons,170 FS and 78 IV were in spring, 201 FS and 77 IV were in summer, 207 FS and 55 IV were in autumn, and 185 FS and 64 IV were in winter. From distributional point of view, 118 FS and 43 IV were subtropical species, 108 FS and 60 IV were temperate region species, and 68 FS and 9 IV were large areal (widely distributed) species.