Aquatic Environment and Biodiversity Annual Review 2012

7.4. Indicators and trends
Annual number
of tows
Trend in
number of tows
Annual and
cumulative (16
year) overlap of
BOMEC habitat
classes up to
2004/05
This analysis
will be updated
for deepwater
trawl fisheries
in 2013
AEBAR 2012: Benthic impacts
2010/11 fishing year:
86 024 trawl tows
35 150 shellfish dredge tows
Trawl effort stable, dredge effort decreasing:
BOMEC
class
Total reported dredge tows
Total reported trawls
160,000
140,000
120,000
100,000
80,000
60,000
40,000
20,000
-
200,000
180,000
160,000
140,000
120,000
100,000
80,000
60,000
40,000
20,000
Area
(km 2 )
0
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
183
Fishing year
TCER
CELR
TCEPR
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
Min. annual
footprint area
(km 2 )
Fishing Year
Max. annual
footprint area
(km 2 )
oysters
scallops
Cumulative (16 yr)
proportion
overlapped
A* 27 557 121 4 026 0.42
B* 12 420 40 484 0.19
C* 89 710 4 271 11 374 0.58
D* 27 268 377 1 602 0.30
E* 60 990 4 046 7 108 0.40
F 38 608 517 1 391 0.13
G 6 342 132 833 0.34
H 138 550 9 583 20 344 0.45
I 52 224 5 511 18 016 0.70
J 311 361 10 469 15 975 0.18
K 1 290 - 2 0.01
L 198 577 4 238 13 599 0.24
M 233 825 895 4 390 0.06
N 493 034 601 1 054 0.02
O 935 315 2 28 0.00
TS & EEZ 4 115 806 46 300 90 940 0.08
* the trawl footprint and proportion overlapped in coastal classes A–E will be grossly underestimated because CELR data
are excluded.