362 
Fishery Bulletin 95(2), 1 997 
Table 1 
Summary of food categories in stomach contents of striped marlin from Cabo San Lucas, B.C.S., Mexico, expressed as percentages 
based on frequency of occurrence (FO), number (n), volume (Vol.), and index of relative importance (IRI). 
Prey 
FO 
% FO 
n 
% n 
Vol. 
% Vol. 
IRI 
% IRI 
Mollusca 
Cephalopoda 
Teuthoidea 
Enoploteuthidae 
Abraliopsis affinis 
12 
3.43 
46 
1.72 
1,254 
0.65 
8.13 
0.19 
Ommastrephidae 
Dosidicus gigas 
99 
28.3 
399 
14.9 
21,866 
11.3 
740.37 
17.8 
Stenoteuthis oualaniensis 
15 
4.28 
34 
1.27 
688 
0.35 
6.93 
0.17 
Octopoda 
Octopodidae 
Octopus spp. 
Argonautidae 
4 
1.14 
11 
0.41 
131 
0.07 
0.55 
0.01 
Argonauta spp. 
13 
3.71 
80 
2.99 
819 
0.42 
12.65 
0.3 
Total 
570 
21.29 
24,758 
12.79 
768.63 
18.47 
Arthropoda 
Crustacea 
Amphipoda 
2 
0.57 
22 
0.82 
13.5 
0.01 
0.47 
0.01 
Isopoda 
Stomatopoda 
3 
0.86 
8 
0.3 
3 
0 
0.26 
0 
Squillidae 
Squilla spp. 
1 
0.28 
1 
0.04 
15.1 
0 
0.01 
0 
Euphausiacea 
Decapoda 
Galatheidae 
3 
0.86 
48 
1.79 
11 
0.05 
1.55 
0.04 
Pleuroncodes planipes 
14 
4 
193 
7.2 
1,929 
0.99 
32.76 
0.79 
Total 
272 
10.15 
1,971.6 
1.05 
35.05 
0.84 
Chordata 
Osteichthyes 
Clupeiformes 
Clupeidae 
30 
8.57 
12 
0.44 
3,206 
1.65 
17.99 
0.43 
Etrumeus teres 
44 
12.57 
199 
7.42 
19,681 
10.16 
220.98 
5.31 
Ophistonema libertate 
10 
2.86 
27 
1.01 
4,985 
2.57 
10.24 
0.25 
Sardinops caeruleus 
Gadiformes 
97 
27.7 
507 
18.92 
36,492 
18.83 
1,046.05 
25.15 
Merluccidae 
Merluccius productus 
Cyprinodontiformes 
Belonidae 
19 
5.43 
257 
9.59 
16,619 
8.58 
98.66 
2.37 
Strongylura spp. 
Syngnathiformes 
Fistulariidae 
1 
0.28 
1 
0.04 
340 
0.17 
0.06 
0 
Fistularia spp. 
Scorpaeniformes 
Triglidae 
16 
4.57 
38 
1.42 
5,065 
2.61 
18.42 
0.44 
Prionotus spp. 
Perciformes 
1 
0.28 
1 
0.04 
10 
0.01 
0.01 
0 
Serranidae 
1 
0.28 
2 
0.07 
245 
0.13 
0.06 
0 
Carangidae 
10 
2.86 
15 
0.56 
2,111 
1.09 
4.72 
0.11 
Caranx caballus 
11 
3.14 
15 
0.56 
1,988.5 
1.02 
4.96 
0.12 
Caranx hippos 
9 
2.57 
10 
0.37 
796 
0.41 
2 
0.05 
Decapterus hypodus 
18 
5.14 
87 
3.25 
8,365 
4.32 
38.91 
0.93 
Selar crumenophthalmus 
16 
4.57 
31 
1.16 
3,337 
1.72 
13.16 
0.32 
Coryphaenidae 
continued on next page 
