REPORT OF THE WORKSHOP ON TRAWL SURVEY ... - FAO.org
REPORT OF THE WORKSHOP ON TRAWL SURVEY ... - FAO.org
REPORT OF THE WORKSHOP ON TRAWL SURVEY ... - FAO.org
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Mean total mortality<br />
Spawning stock biomass<br />
2<br />
3<br />
1.8<br />
1.6<br />
2.5<br />
Mean Z ( 2- 4)<br />
1.4<br />
1.2<br />
1<br />
.8<br />
.6<br />
Mean-standardised SSB<br />
2<br />
1.5<br />
1<br />
.4<br />
.2<br />
.5<br />
0<br />
1985 1990 1995 2000 2005<br />
0<br />
1985 1990 1995 2000 2005<br />
Year<br />
Year<br />
Total stock biomass<br />
Recruitment<br />
9<br />
2.5<br />
8<br />
Mean-standardised TSB<br />
2<br />
1.5<br />
1<br />
.5<br />
Mean-standardised recruitment at age 1<br />
7<br />
6<br />
5<br />
4<br />
3<br />
2<br />
1<br />
0<br />
1985 1990 1995 2000 2005<br />
0<br />
1985 1990 1995 2000 2005<br />
Year<br />
Year<br />
Fig. 14.<br />
North Sea haddock : retrospective analyses of the ICES IBTSQ1 survey data<br />
using the survey-only model SURBA (note: 6+ group not included in analysis<br />
– hence SSB in 2005&2006 is underestimated due to exclusion of data from<br />
strong 1999 year class).<br />
67
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