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Stock Structure Indices
Sauger PSD values were mostly consistent within a season and seasonal values decreased as the seasons
progressed during 2002 (Table 10). The 2002 spring combined PSD value was significantly higher than
the autumn combined value. No significant difference was observed for 2003 seasonal combined PSD
values. Sauger PSD for limnetic locations was significantly higher than for littoral locations in summer
of 2002 and autumn of 2003. The highest number of stock-length sauger sampled was during autumn for
both 2002 and 2003.
Sauger RSD-P values were significantly higher for littoral locations than limnetic locations during spring
of 2002 and summer of 2003. Sauger RSD-P values were significantly higher for limnetic locations than
littoral locations during summer 2002 and autumn 2003. The sauger PSD-P value was significantly
higher in the upper zone than the lower zone only during the summer of 2003. The combined RSD-P
value was significantly higher during autumn than spring or summer in 2003.
Sauger RSD-M values ranged from zero to 10 during spring through autumn in 2002 and zero to 11
during spring through autumn 2003. Highest RSD-M values were obtained in the spring of 2002 and
summer of 2003, 10 and 11, respectively. The combined sauger RSD-M value for spring 2002 was
significantly higher than summer or autumn. Summer 2003 had significantly a higher combined RSD-M
value than autumn but not spring.
Walleye PSD values were generally higher in the upper zone than the lower zone in 2002 and 2003 (Table
11). Significantly higher PSD values were observed in the upper zone than the lower zone during
summer and autumn of 2002 and spring and summer of 2003. The combined PSD value was significantly
lower in autumn than in spring or summer of 2002. Combined PSD value was significantly higher in
autumn than in spring or summer of 2003. The highest number of stock-length walleye sampled was
during autumn for both 2002 and 2003.
Differences in walleye RSD-P values, between zones and littoral and limnetic locations, were detected
only during the summer of 2003. Walleye RSD-P values were similar, between zones and littoral and
limnetic locations, for spring through autumn of 2002 and spring and autumn of 2003. Combined RSD-P
values were similar spring through autumn for both 2002 and 2003.
Walleye RSD-M values ranged from zero to 2 during spring through autumn 2002 and zero to 1 during
spring through autumn 2003. During the summer of both 2002 and 2003 no memorable-length walleye
was sampled. No significant difference of combined RSD-M values was detected among spring, summer,
or autumn during 2002 or 2003.
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