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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

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