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1996 following a release of 2,000- 285 mm fish at Horseshoe Bend on the upper Salt River. The <br />fish released were of upper basin origin from Ouray NFH and reared at Bubbling Ponds. SFH. <br />Over the past 50 years, fewer than twenty RBS have been collected from the Grand <br />Canyon (Maddux et al. 1987, Hendrickson and Kubly 1990). The last known RBS to be captured <br />from the mouth of the Little Colorado River was in 1989 (Hendrickson and Kubly 1990). There <br />are no records indicating historical RBS stockings in the Grand Canyon and no current plans exist <br />to augment the Little Colorado River RBS population. <br />Dexter NFHTC Lake Mohave Broodfish <br />Captive broodstocks representing the Lake Mohave population exist at Dexter NFHTC. <br />According to station records, the initial broodstock was founded with progeny from 136 wild <br />adult fish collected from Lake Mohave in 1981. An additional 147 wild individuals were <br />collected from the lake in 1982, spawned that year, and contributed fry to the stocking efforts in <br />the Gila, Salt and Verde rivers and Lake Mohave, but were not incorporated into the captive <br />broodstock. In 1984, Dexter's RBS captive broodstock consisted of 360 three-year old fish <br />derived from the wild adults spawned at Dexter NFHTC in 1981. Station records do not show <br />any additional augmentation of the captive stock with wild caught or captively produced <br />individuals, and the captive broodfish inventory does not reflect an increase in fish numbers. <br />Wild caught adults collected in 1981 and 1982 had expired by the end of 1985. <br />The first captive broodstock of RBS at Dexter NFHTC will be referred to as the `81 <br />broodstock. The `81 broodstock currently contains 133 adult fish (Table 2). Initial spawning of <br />this broodstock occurred in 1984 (Hamman1985). It should be noted that no progeny of the `81 <br />broodstock are currently held as broodstock at any facility. Since the broodstock's inception, all <br />offspring have been stocked to meet production commitments. Over the past 19 years, offspring <br />from this stock have been stocked into Lake Mohave and Lake Havasu; Gila, Salt, Verde and San <br />13