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64 <br />1980 INVESTIGATIVE PROGRAM <br />The 1980 investigative program will be conducted in similar fashion to <br />the 1979 program to allow for statistical comparison and integration of <br />data between 1979 and 1980. <br />The shortened 1979 field season permitted only one or two sample visits <br />to each of the river stratum. In 1980, each stratum will be sampled <br />three times with the same sample techniques and methodology. <br />Increased effort is planned in spring 1980 to assess timing and location <br />of spawning humpback chubs in Black Rocks and Westwater Canyon. Efforts <br />will be made to capture and hold ripe and gravid fish and strip eggs for <br />use in hatchery rearing experiments. Habitat information will also be <br />recorded-for spawning sites. <br />Spawning and habitat information will be recorded for Colorado squawfish <br />in spring and early summer. A radio tagging program is to be initiated <br />to better follow spawning behavior of squawfish and to define specific <br />spawning areas so as to determine the constituents of spawning habitats. <br />Next year, data will be collected on food habits of young-of-year squawfish <br />and all sympatric species from one area in both the Colorado and Green <br />Rivers. Further work will be conducted on patterns of use of the backwater <br />areas and the hydraulics and biological factors that influence the <br />utilization of this particular habitat by squawfish.