Table 22. Blueback herring sampling rates and preserved specimen analysis status for each NEAMAP cruise. Season Spring
Fall
Year 2008 2009 2010 2011 2012 2007 2008 2009 2010 2011 2012
Number Biomass Caught Caught (kg) 3,693 62.2 5,603 160.3 4,992 86.6 77,071 957.3 6,258 70.0 50 1.6 20 0.7 15 0.6 22 0.6 2 0.1 4 0.1
Number Age Measured Specimens 1,774 237 2,808 315 2,436 280 2,713 226 2,221 144 50 18 20 9 15 6 22 15 2 2 4 4
Ages Read 0 0 0 0 0 0 0 0 0 0 0
Stomach Specimens 235 315 276 219 141 18 9 6 14 2 4
Stomachs Analyzed 0 2 21 216 0 0 0 6 12 2 0
Table 23. Blueback herring preliminary geometric mean indices of abundance, by number and biomass, for spring NEAMAP surveys, for all specimens captured and for the youngest year class captured. Spring Survey Age
Yea r
Al l
2007 2008 2009 2010 2011 2012 2013 2014 2015 2016
n
0
2007 2008 2009 2010 2011 2012 2013 2014 2015 2016
1
2007 2008 2009 2010 2011 2012 2013 2014 2015 2016
Bi oma s s I ndex
Numeri ca l I ndex LCI
Index
UCI
LCI
Index
UCI
150 160 150 150 150
1.17 1.55 1.30 0.81 0.65
1.76 2.30 1.99 1.27 1.18
2.52 3.26 2.90 1.84 1.88
0.12 0.23 0.12 0.11 0.08
0.20 0.34 0.20 0.19 0.17
0.28 0.47 0.30 0.27 0.27
150 160 150 150 150
0.91 0.77 1.06 0.59 0.59
1.40 1.20 1.66 0.98 1.09
2.02 1.73 2.44 1.48 1.76
0.08 0.08 0.09 0.07 0.07
0.14 0.15 0.17 0.14 0.16
0.20 0.21 0.25 0.22 0.26
Figure 48. Blueback herring preliminary geometric mean indices of abundance, by number and biomass, for spring NEAMAP surveys, for all specimens captured (A) and for the youngest year class captured (B).
A
B
129