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15 <br />Of all anglers, only 2% on the Green River and 8% on the <br />Colorado River fished exclusively with artificial lures. All <br />others fished with bait, usually worms or liver, with spinning <br />gear. All Colorado squawfish on the Green River were caught with <br />lures, and the squawfish on the Colorado River with worms. <br />Anglers fished almost exclusively from the bank with less than 1% <br />of angling from each river being from boats. <br />Discussion <br />This creel survey provided some estimates of fishing <br />pressure and Colorado squawfish catches from portions of the <br />Green and Colorado Rivers in Utah. Assessing the impacts of <br />fishing pressure on the squawfish based on this survey is <br />difficult, and at best only a rough estimate. If the impact of <br />fishing is to be adequately assessed, the total fishing pressure <br />and total squawfish catch should first be more accurately <br />estimated. Three other factors must also be considered: 1) the <br />population of adult squawfish with the study area, 2) the angling <br />related mortality rate, and 3), the recruitment rate. <br />Fishing pressure as represented by this survey totaled <br />1072.55 angler hours in five months on the Green River and <br />1105.25 hours in six months on the Colorado River. For both <br />rivers combined, the average anglers per day ranged from 1 to 12, <br />on approximately 80 river kilometers. These numbers are quite <br />