Aquatic Environment and Biodiversity Annual Review 2012

AEBAR 2012: Non-protected bycatch
Table 5.12: Potential and residual risk scores for each seabird taxon with a potential risk score of >=30 in
Rowe (2010). Residual risk (“optimal risk” in Rowe 2010b, not tabulated therein for grey-faced petrel or
light-mantled albatross) is estimated assuming mitigation is deployed and correctly used throughout all
interacting fisheries.
Taxon Potential score Residual score Percent reduction
White-chinned petrel 159 123 23
Sooty shearwater 126 108 14
Black (Parkinson's) petrel 139 106 24
Salvin's albatross 161 106 34
White-capped albatross 141 94 33
Flesh-footed shearwater 117 92 21
Southern Buller's albatross 123 85 31
Grey petrel 123 84 32
Black-browed albatross 114 80 30
Northern Buller's albatross 107 72 33
Chatham albatross 114 71 38
Campbell albatross 97 66 32
Westland petrel 89 59 34
Antipodean albatross 89 55 38
Gibson's albatross 89 55 38
Wandering albatross 89 55 38
Southern royal albatross 79 49 38
King shag 48 48 0
Pitt Island shag 46 46 0
Chatham Island shag 45 45 0
Hutton's shearwater 37 35 5
Northern giant petrel 62 35 44
Pied shag 35 35 0
Indian yellow-nosed albatross 58 34 41
Southern giant petrel 61 34 44
Fluttering shearwater 34 32 6
Spotted shag 31 31 0
Stewart Island shag 31 31 0
Yellow-eyed penguin 30 30 0
Grey-faced petrel 31 – –
Light-mantled albatross 30 – –
Setnet and inshore trawl fisheries groups posed the greatest residual risk to seabirds (summed across
all taxa); both had aggregate scores of over 200 and had no substantive mitigation. Surface and
bottom longline fisheries and middle-depth trawl fisheries for finfish and squid also had aggregate
risk scores of 100 or more. These risk scores were substantially reduced if mitigation was assumed to
be deployed throughout these fisheries (reductions of 24 to 56%), but all remained above 100.
Trawling for southern blue whiting and deep-water species, inshore drift net, various seine methods,
ring net, diving, dredging, and hand gathering all had aggregate risk scores of 40 or less if mitigation
was assumed to be deployed throughout these fisheries. Diving, dredging, and hand gathering were all
judged by the panel to pose essentially no risk to seabirds.
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