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Table 11. Proportional stock density (PSD) and relative stock density-preferred and memorable
(RSD-P, RSD-M) of walleye for littoral and limnetic locations, and the upper and lower
zones of Lewis and Clark Lake during spring, summer, and autumn of 2002 and 2003.
Seasonal PSD, RSD-P, and RSD-M values for upper and lower zones and littoral and
limnetic locations with an asterisk are significantly different (p=0.05). Combined PSD,
RSD-P, and RSD-M values, within the same year, that have no letter in common are
significantly different (p=0.05). N equals the number of stock-length fish.
Spring 2002
Strata PSD RSD-P RSD-M N
Upper zone 58 3 1 72
Lower zone 61 10 2 61
Littoral 65 9 1 69
Limnetic 53 3 2 64
Combined 59a 6a 2a 133
Summer 2002
Upper zone 80* 2 0 86
Lower zone 59 9 0 58
Littoral 64 9 0 47
Limnetic 75 4 0 97
Combined 72a 6a 0a 144
Autumn 2002
Upper zone 59* 7 1 152
Lower zone 28 9 1 82
Littoral 50 10 2 129
Limnetic 45 5 0 105
Combined 48b 8a 1a 234
Spring 2003
Upper zone 56* 11 0 84
Lower zone 28 7 1 107
Littoral 38 6 1 108
Limnetic 43 12 0 83
Combined 40a 8a 1a 191
Summer 2003
Upper zone 46* 20* 0 54
Lower zone 23 6 0 48
Littoral 24 5* 0 41
Limnetic 41 20 0 61
Combined 34a 14a 0a 102
Autumn 2003
Upper zone 53 14 1 110
Lower zone 54 6 0 179
Littoral 52 9 1 116
Limnetic 55 9 0 173
Combined 54b 9a 0a 289
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