Fishery Bulletin 119(1) 
54 
Table 2 
Dietary indices for each prey group identified in the stomach contents of specimens of 7 species of Gadiformes caught in the western Mediterranean Sea during 2011-2017. 
The number of trawl tows, sample size, range of total lengths (TLs), niche breadth, depth range, trophic level, and number of prey items also are provided for each of the 12 
categories that combine species and size class (small [S] and large [L]). The dietary indices used in analyses include frequency of occurrence (%FO), the number of stomachs 
that contained a prey group compared with the total number of stomachs examined; the number index (%N), the number of individuals of a prey group compared with the 
total number of ingested prey; the volume index (%V), the volume of a prey group compared with the total volume of all prey ingested by a predator category; and the geo- 
metric index of importance (%GII), which incorporates both %FO and %V. A dash indicates that no consumption of that prey group was recorded for that species. The species 
studied include the silvery pout (Gadiculus argenteus) (GAD), Mediterranean bigeye rockling (Gaidropsarus biscayensis) (GAI), Mediterrenean ling (Molva macrophtalma) 
(MOL), European hake (Merluccius merluccius) (MER), blue whiting (Micromesistius poutassou) (MIC), greater forkbeard (Phycis blennoides) (PHY), and poor cod (Trisopterus 
minutus) (TRI). 
——=—ooe—Ne—606—0—0. a 
Information type or 
prey group Index GADg GAD, MOL, MOL, MER, MER, MIC, MIC, PHY, 
No. of trawl tows 16 29 26 20 36 13 
Sample size 44 219 116 107 172 614 75 211 323 
Length range (mm) 60-92 93-133 40-180 83-165 166-740 87-149 150-549 89-169 170-377 85-149 150-393 78-272 
Niche breadth 0.51 0.39 0.34 0.14 0.30 0.60 0.45 0.24 0.28 0.64 0.17 0.14 
Depth range (m) 109-647 131-647 59-634 122-327 86-634 34-342 34-722 76-611 1387-722 538-728 176-728 36-352 
Trophic level 3.47 3.57 3.93 4.36 4.49 3.95 4.24 3.98 4.21 3.99 3.99 3.94 
No. of prey items 9 33 27 8 13 38 25 58 
Small plankton 18.8 11.9 LY = - - 1.5 1.0 
14.3 5.4 3.0 0.0 0.0 
79.9 60.7 30.2 0.4 0.2 
16.5 8.7 10.3 0.7 0.5 
Large plankton 46.9 51.5 7.8 ! : 13.0 13.6 
48.8 47.2 1.6 , : : 11.6 4.4 
10.8 29.6 4.0 : : 13.2 8.4 
47.8 49.4 4.7 : i 12.3 9.0 
Polychaeta - 0.5 1.0 ; 8.7 1.9 
- 0.3 1.8 ; 2.6 0.1 
- 0.0 0.4 : Del 0.6 
- 0.4 1.4 ; ; 1.0 
Cephalopoda - — - H : A 1.9 
= - , ; ; 1.1 
~ _ ; : : 0.4 
1.5 
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