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B, Table 22). Increased reproduction over an extended period will be important <br />to the recovery of Colorado squawfish. However, examination of the relationship <br />between variation in reproductive success and various environmental variables <br />will be an important step in determining how to improve spawning success. <br />Therefore, it will be important to reliably detect year-to-year variations in <br />reproductive success. The current monitoring program can accomplish this at <br />differences of 100% or greater. Observed fluctuations in fall CPUE of age-0 <br />Colorado squawfish have exceeded 1000% (Jones and Tyus 1985). <br />DISCUSSION <br />Although a large body of data collected before ISMP exists, relatively little <br />of it can be reasonably compared with that of the monitoring program. All the <br />previously collected electrofishing data was collected with such a wide variety <br />of sampling techniques and over various portions of the sampling reaches that <br />meaningful comparisons cannot be made. However, the fall young-of-the-year <br />sampling conducted by the Fish and Wildlife Service is comparable if the older <br />data are partitioned carefully. The sampling design used by the Fish and <br />Wildlife Service formed the basis for the sampling design of ISMP. The ISMP <br />generally has more restrictive specifications on the sampling design that in the <br />previously collected data. However, the combined data can be used to examine <br />the relationships between annual reproductive success of Colorado squawfish and <br />the environmental variables that might affect it. <br />19