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Table 1 Mean abundance and percentage occurrence of fish taxa recorded by the ROV and UVCs at the five depth layers

From: Assessing the suitability of a remotely operated vehicle (ROV) to study the fish community associated with offshore gas platforms in the Ionian Sea: a comparative analysis with underwater visual censuses (UVCs)

Taxa 0–6 (m) 12–18 (m) 22–28 (m) 50–56 (m) 70–76 (m)
ROV UVC ROV UVC ROV ROV ROV
Av. Ab. SE %O Av. Ab. SE %O Av. Ab. SE %O Av. Ab. SE %O Av. Ab. SE %O Av. Ab. SE %O Av. Ab. SE %O
PLA
 Anthias anthias 2.8 2.8 3.7 1.6 1.5 11.1 38.2 11.3 48.1 86.3 32.7 66.7 106.1 31.0 66.7 378.6 49.8 100.0 443.3 87.6 100.0
 Boops boops 24.4 10.0 22.2 18.8 12.9 33.3 25.2 9.2 25.9 34.4 15.2 37.0 12.7 6.6 18.5       
 Chromis chromis 29.5 9.2 74.1 44.4 11.4 81.5 29.8 8.7 55.6 36.6 9.5 81.5 24.8 7.7 55.6 42.5 24.5 27.8    
 Oblada melanura 15.0 8.0 22.2 22.3 8.4 40.7 9.3 5.8 22.2 10.3 6.4 22.2 5.0 3.6 11.1       
Spicara spp. 2.8 2.8 2.8 8.7 6.1 14.8 7.0 5.7 7.4 12.3 6.6 25.9 1.5 1.5 3.7       
Trachurus spp.           0.0 0.0 3.7          
PEL
 Pomatomus saltator              3.0 2.1 7.4       
 Sarda sarda                 4.2 4.2 5.6    
 Seriola dumerilii 1.5 1.5 7.4 1.5 1.5 7.4 3.0 1.2 29.6 0.4 0.2 14.8 4.2 1.5 33.3 4.4 2.6 16.7 7.6 4.6 33.3
NEC-BEN
 Diplodus annularis     0.0 0.0 3.7                
 Diplodus puntazzo           0.0 0.0 3.7          
 Diplodus sargus        0.1 0.1 3.7 0.5 0.3 14.8 0.3 0.3 7.4       
 Diplodus vulgaris 0.8 0.7 11.1 1.9 1.1 11.1 1.1 0.8 14.8 2.5 1.5 37.0 1.1 0.7 33.3 3.3 1.6 33.3 2.2 2.2 11.1
 Epinephelus aeneus              0.0 0.0 3.7       
 Phycis phycis                 0.1 0.1 5.6 0.2 0.2 11.1
 Serranus cabrilla     0.0 0.0 3.7        0.0 0.0 3.7       
 Serranus scriba           0.0 0.0 3.7          
 Spondyliosoma chantarus           3.4 2.4 14.8 0.0 0.0 3.7 0.5 0.4 11.1    
 Thalassoma pavo 0.7 0.2 44.4 8.6 2.0 81.5 0.6 0.3 29.6 10.9 2.8 85.2 0.2 0.1 7.4 0.1 0.1 5.6    
CRY
 Coryphoblennius galerita     0.1 0.1 7.4                
 Lipophrys trigloides     0.3 0.1 22.2                
 Murena helena           0.0 0.0 3.7     0.2 0.1 22.2    
 Parablennius gattoruggine 0.1 0.1 7.4 0.6 0.2 48.1     0.1 0.1 7.4          
 Parablennius incognitus     0.1 0.1 7.4     0.1 0.1 11.1          
 Parablennius pilicornis     0.1 0.1 7.4                
 Parablennius rouxi           0.7 0.2 44.4          
 Parablennius zvonimiri           0.4 0.2 25.9          
 Scorpaena maderensis     6.4 0.9 96.3     4.2 0.7 85.2          
  1. PLA Planktivorous fish, PEL Pelagic fish, NEC -BEN Nekto-benthic fish, CRY Crypto-benthic fish, Av. Ab. average abundance, SE standard error, %O percentage occurrence