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Volume 1 (Issue #3), 1993 <br />100 <br />80 <br />0 ~ <br />a ~ <br />20 <br />30 <br />d 20 <br />N <br />~ 10 <br />Mar Apr May Jun <br />.~. 25 <br />v 24 <br />STOCK DENSITY INDICES <br />t 23 <br />r <br />C~ 22 <br />C <br />J 21 <br />C 20 <br />8s <br />d 19 <br />18 <br />Mar Apr Mey Jun Jul Aug Sap Oct <br />Month <br />FIGURE 2. Changes in proportional stock density (PSD), relative stock <br />density of preferred-length fish (RSD-P), and mean length for stock- <br />, length (?13 cm) black crappies in Lake Madison, South Dakota, 1990. <br />The 1988 year class represented nearly the entire adult black crappie <br />population. Sample size each month ranged from 158 to 979 fish, and <br />was based on 17 to 20 trap net nights of effort each month. <br />217 <br />Jul Aug Sap Oct <br />Mar Apr May Jun Jul Aug Sap Oct <br />