Total marine fisheries extractions by country in the Baltic Sea

Catch ( x 10 3 t)
Catch ( x 10 3 t)
Total marine fisheries extractions by country in the Baltic Sea: 1950-present, Rossing, Booth and Zeller 259
1950s, most adjustments were mainly 70
taxonomic re-allocation of landings
Others
tonnage from pooled ‗miscellaneous‘
60
groups (other taxa) to individual taxa, 50
resulting in virtually no net change in 40
adjustment tonnage (Figure B1, Table B2).
30
Herring
During the 1960s and the 1970s the net
change in adjustments were approximately 20
Cod
29,000 t and 18,000 t, respectively, and
Sprat
10
about 98% of that was due to adjusted cod
0
catches (Table B2). The adjustments were
1950 1960 1970 1980 1990 2000
small during the 1980s and only accounted
for just over 2,000 t for the decade, mainly
Year
due to sprat adjustments in 1987 (Table Figure B2. Sweden‘s unreported landings by taxa for the
B2). The largest adjustments were done Baltic Sea from 1950-2007.
during the 1990s, and nearly all were due
to misreported herring and sprat catches (Table B2).
The herring catches were adjusted by about -206,000 t and the sprat catches were adjusted by around
99,000 t, resulting in reductions in landings (Figure B1). During the 2000s (2000-2007), the adjustments
were about -86,000 t, and were largely due to misreported herring and sprat landings (Table B2).
Unreported landings
Unreported landings were estimated and added to ICES landings statistics + adjustments to generate
estimates of total commercial landings (in contrast to total catches). Sweden‘s‘ unreported landings were
very low in 1950 (3,800 t∙year -1 ) and increased slowly to the end of the 1970s (Figure B2). They increased
more rapidly
during the 1980s
to, on average,
25,000 t∙year -1 ,
and rose sharply in
the early 1990s to a
peak of 62,000 t in
1998 (Figure B2).
Unreported
landings fell
rapidly in the early
2000s to 16,000 t
by 2007. Decadal
totals
for
unreported landings by main taxonomic entities are presented in Table (B3). The total unreported
landings were estimated at about 1.1 million t from 1950-2007, of which 97% was unreported landings of
the three major commercial species cod, herring and sprat (Figure B2, Table B3). Cod and herring
dominated unreported landings until the 1990s, after which unreported sprat landings dominated total
unreported landings (Figure B2, Table
B3).
Discards
Discards were comprised of four
components (see Methods for details) and
were estimated and applied to total
landings (i.e., ICES landings statistics +
adjustments + unreported landings). The
total estimated discards were about 0.5
million t for the entire period (Figure B3,
Table B4). Discards were relatively low
from the 1950s until the late 1970s,
Table B3. Estimated unreported landings (t) summed by decade for the major taxonomic
entities of Swedish fisheries in the Baltic Sea.
Common
Unreported landings (t)
name 1950s 1960s 1970s 1980s 1990s 2000s a
Cod 14,460 23,408 25,014 127,659 67,731 19,408
Herring 19,373 28,579 59,100 106,848 147,212 61,051
Sprat 556 1,580 3,357 6,830 246,231 101,357
Flatfishes 511 637 386 256 684 269
Salmons 411 320 478 471 605 317
Others b 2,864 5,531 3,570 3,231 5,357 2,656
a the 2000s only include data from 2000-2007.
b
Includes sea trout (Salmo trutta), eel (Anguilla anguilla), whitefishes (Coregonus lavaretus).
25
20
15
10
5
Flatfish
Herring
Salmon
Cod
Others
Sprat
0
1950 1960 1970 1980 1990 2000
Year
Figure B3. Sweden‘s discards by taxa 1950-2007.