Table 1. Composition of the stomach contents of Sebastes inermis by frequency of occurrence (%F), wet weight (%W), index of relative importance (IRI), and relative IRI ratio (%IRI)

Prey organisms	%F	%N	%W	IRI	%IRI
Pisces	16.6	8.4	52.1	1,047.2	14.5
Setipinna tenuifilis	1.4	0.6	2.8
Triglidae	0.5	0.2	+
Cynoglossidae	8.3	4.3	41.0
Unidentified pisces	6.4	3.3	8.3
Crustacea
Amphipoda	3.7	2.2	0.1	8.8	0.1
Caprellidae	0.5	0.2	+
Gammaridea	3.2	2.0	0.1
Decapoda
Brachyura	35.3	21.7	23.0	1,616.7	22.4
Charybdis bimaculate	11.0	8.8	13.4
Charybdis japonica	7.3	4.5	5.9
Gaetice depressus	1.8	0.8	0.4
Unidentified brachyura	15.1	7.6	3.3
Macrura	70.9	42.8	14.2	4,193.6	58.2
Alpheus japonicus	4.6	2.0	0.5
Crangon hakodatei	7.4	3.7	2.8
Latreutes sp.	1.4	1.2	0.6
Palaemon carinicauda	1.4	1.0	0.8
Palaemon graviera	2.3	1.0	0.8
Trachysalambria curviostris	2.8	1.4	1.7
Acetes japonicus	17.0	11.5	2.9
Heptacarpus pandaloides	1.4	0.6	+
Unidentified macrura	32.6	20.4	4.1
Stomatopoda	7.8	13.6	2.6	145.1	2.0
Oratosquilla sp.	0.5	0.2	0.1
Mysidacea	7.3	13.4	2.5
Isopoda	1.8	0.8	0.6	2.52	+
Sphaeromatidae	1.8	0.8	0.6
Cephalopoda	10.1	5.4	3.4	109.1	1.5
Polychaeta	8.7	4.7	4.0	84.4	1.2
Seagrass	0.9	0.4	+	0.1	+
Total		100	100		100

+, less than 0.1%.