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Recommended Changes <br />The 1979 field investigations revealed the need for several modifications <br />to the sample schedule and technique, as well as the opportunity to <br />identify critical sample areas and times more concisely. The following <br />is a synopsis of those recommendations: <br />Black Rocks and Walter Walker Wildlife area shouldbe sampled at critical <br />times i.e. in May-June to identify spawning time and habitat of humpback <br />chub and in July-August to identify spawning habitat and success _ <br />of Colorado squawfish. <br />A completely randomized selection of river strata often results in <br />sampling adjacent strata far from Grand Junction at two distinct times <br />necessitating additional travel-time and expense. The three strata <br />between Potash and Hite Marina, for example, should'be sampled sequentially <br />because of the extensive logistics of rafting through this river reach. <br />A systematic progressive sampling schedule is suggested when logistics <br />dictate. <br />Experience has demonstrated the relative effectiveness of different <br />gears in the velocity of habitats encountered, the following changes <br />are recommended for gear use during 1980. <br />1. Reduce use of seines 1/2 inch mesh or larger because of the high <br />effort and low success involved in their use.