Cordova-Zavaleta et al.: Food habits of Prionace glauca in waters off northern Peru 
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Table 1 
Diet composition of blue sharks ( Prionace glauca), based on analysis of stomach contents collected be¬ 
tween February and December 2015 off northern Peru, by percent frequency of occurrence (%FO), percent 
prey-specific number (%PN), percent number (%N), percent prey-specific weight (%PW), percent weight 
(%W) and the prey-specific index of relative importance (%PS1RI). 
Prey species 
%FO 
%N 
%PN 
%W 
%PW 
%PSIRI 
CEPHALOPODA 
Decapodiformes 
Oegopsida 
4.35 
0.27 
6.18 
<0.01 
<0.01 
0.13 
Ancistrocheiridae 
Ancistrocheirus lesueurii 
14.78 
5.07 
34.31 
7.37 
49.86 
6.22 
Chiroteuthidae 
Chiroteuthis veranyi 
3.48 
1.45 
41.83 
0.93 
26.85 
1.19 
Grimalditeuthis bonplandi 
11.30 
1.88 
16.66 
<0.01 
<0.01 
0.94 
Cranchiidae 
Galiteuthis pacifica 
2.61 
1.14 
43.63 
0.88 
33.55 
1.01 
Leachia danae 
4.35 
1.06 
24.34 
0.24 
5.42 
0.65 
Enoploteuthidae 
Abraliopsis affinis 
1.74 
0.51 
29.35 
0.28 
16.34 
0.40 
Gonatidae 
Gonatus antarcticus 
11.30 
4.06 
35.90 
5.88 
51.98 
4.97 
Gonatus sp. 
0.87 
0.87 
100.00 
0.87 
100.00 
0.87 
Histioteuthidae 
Histioteuthis cerasina 
0.87 
0.14 
16.67 
0.05 
6.00 
0.10 
Stigmatoteuthis hoylei 
6.96 
2.12 
30.44 
2.91 
41.83 
2.51 
Mastigoteuthidae 
Mastigoteuthis dentata 
2.61 
1.53 
58.59 
0.88 
33.64 
1.20 
Octopoteuthidae 
Octopoteuthis sicula 
6.09 
1.65 
27.15 
1.30 
21.35 
1.48 
Ommastrephidae 
Dosidicus gigas 
6.09 
1.58 
26.03 
4.03 
66.17 
2.81 
Ommastrephes bartramii 
1.74 
0.61 
35.00 
1.22 
70.40 
0.92 
Onychoteuthidae 
Onychoteuthis banksii 
4.35 
0.89 
20.46 
0.07 
1.72 
0.48 
Pholidoteuthidae 
Pholidoteuthis massyae 
3.48 
0.27 
7.74 
0.11 
3.05 
0.19 
Thysanoteuthidae 
Thysanoteuthis rhombus 
12.17 
5.53 
45.41 
6.43 
52.79 
5.98 
Myopsida 
Loliginidae 
Doryteuthis (Amerigo) gahi 
2.61 
0.49 
18.88 
1.39 
53.43 
0.94 
Octopodiformes 
Argonautidae 
Argonauta spp. 
26.09 
17.60 
67.46 
14.52 
55.65 
16.06 
Bolitaenidae 
Japetella diaphana 
7.83 
3.61 
46.18 
3.15 
40.21 
3.38 
Japetella heathi 
1.74 
0.34 
19.64 
<0.01 
<0.01 
0.17 
Enteroctopodidae 
Muusoctopus sp. 
0.87 
0.14 
16.67 
0.01 
0.73 
0.08 
Octopodidae 
Eledone spp. 
0.87 
0.05 
5.71 
<0.01 
<0.01 
0.02 
Tremoctopodidae 
Tremoctopus uiolaceus 
1.74 
0.10 
5.72 
0.01 
0.77 
0.06 
Vitreledonellidae 
Vitreledonella richardi 
1.74 
0.07 
4.26 
<0.01 
0.00756 
0.04 
Vampyromorphida 
Vampyroteuthidae 
Vampyroteuthis infernalis 
6.96 
2.42 
34.82 
2.96 
42.55 
2.69 
Unidentified cephalopods 
33.04 
29.57 
89.47 
33.04 
99.98 
31.30 
Table continued 
