Total marine fisheries extractions by country in the Baltic Sea

Total marine fisheries extractions by country in the Baltic Sea: 1950-present, Rossing, Booth and Zeller 91
Seal-damaged discard rates for salmon,
derived from FGFRI data, were compared to
the boat-based salmon discard rates derived
from ICES stock assessment working group
data (see ‗Methods‘ in Zeller et al., this
volume) for the period 1980-2007 (Table 7).
To avoid potential double accounting due to
damage caused by seals, only the higher
discard rate between the two categories was
used.
Species specific, seal-damaged discard rates for
trout, whitefish, perch, pikeperch, and vendace
were derived from FGFRI data and compared
to the default boat-based discard rates for
these species derived from a Danish study
(Anon., 2006). The higher discard rate was
chosen to avoid double accounting, in cases
where seal-discards may have already been
accounted for in the boat-based discards.
Recreational catches
Estimates of Finland‘s recreational catches
from the Baltic Sea were provided by our
collaborators at FGFRI. FGFRI has undertaken
studies to estimate recreational catches
throughout most of the time period considered
here (FGFRI, 2009). Recreational catches were
estimated by FGFRI starting in 1953 and since
1986 these estimates have been done every
other year with the exception of 1955-1958 and
1960-1961 when recreational catch surveys
were not carried out. In years when recreational catch surveys were not done, FGFRI provided estimates
of recreational catches for the non-surveyed years. For the period 1950-1952, we estimated annual
recreational catches based on the average catch from 1953-1955 as reported by FGFRI.
Overall, our total reconstructed catch was the sum of ICES landings statistics, reported landings
adjustments and estimates of unreported landings, discards and recreational catches. The estimated total
reconstructed catch was then compared to the officially reported data, defined here as the ICES landings
statistics.
RESULTS
ICES landing statistics for Finland totaled 4,468,766 t over the 1950-2007 time period (Figure 2).
Landings according to ICES showed a steady increase over the study period from around 20,000 t in 1950
to approximately 100,000 t∙year -1 in the late 1970s. A significant decline in reported landings occurred in
the early 1990s to roughly 75,000 t∙year -1 , followed by an increase from the mid-1990s to the early 2000s,
with the highest reported landings of almost 130,000 t in 2007 (Figure 2).
Illegal, Unreported and Unregulated (IUU) catches
Table 7. Salmon discard rates (%) for boat-based
discards derived from ICES stock assessment working
group data (ICES, 2008b) and seal-damaged discards
derived from FGFRI. Only the highest rate of the two
discard categories was used. Values in italics indicate an
interpolated rate.
Year
Discards
Boat-based Seal-damaged Rate used
1950-1980 14.44 0.00 14.44
1981 8.31 4.2 8.31
1982 8.29 8.46 8.46
1983 9.00 12.68 12.68
1984 8.14 16.91 16.91
1985 7.73 21.14 21.14
1986 8.77 25.37 25.37
1987 8.47 29.59 29.59
1988 8.61 33.82 33.82
1989 8.91 38.05 38.05
1990 10.17 42.28 42.28
1991 7.95 46.50 46.50
1992 7.83 50.73 50.73
1993 8.52 54.96 54.96
1994 7.80 59.19 59.19
1995 8.36 63.42 63.42
1996 8.99 67.64 67.64
1997 8.58 71.87 71.87
1998 8.58 76.10 76.10
1999 8.83 80.33 80.33
2000 5.76 84.55 84.55
2001 9.10 103.21 103.21
2002 9.61 95.66 95.66
2003 9.77 127.51 127.51
2004 9.10 94.37 94.37
2005 8.76 83.22 83.22
2006 10.02 95.97 95.97
2007 10.02 79.91 79.91
Catches that were not presented in the ICES landings statistics were considered components of IUU. These
included data source adjustments to ICES landings, unreported (‗unallocated‘) landings, discards and
recreational catches.