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15<br />
~ Day<br />
~ Nigh t<br />
10 -I<br />
5<br />
0<br />
0 1 2<br />
Age (years)<br />
3<br />
Figure 4<br />
. Comparison of the abundances (number/tow) of cod sampled at different<br />
(years) during all daytime and nightime tows, combined for both the<br />
ages<br />
Bellevue and Kelligrews study sites . The error bars represent one standard<br />
deviation of the population mean<br />
. 9