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11 <br />Retrieval of Adult Razorback Suckers <br />w <br />Over the course of sampling, a total of 87 adult razorback <br />suckers (or their parts) were recovered from the, Yuma Cove <br />backwater (Table 3). Most (83, or 94%) of these were captured <br />alive and returned to Lake Mohave. Four (5%) natural mortalities <br />were known (one represented by preservable remains, the other three <br />in states of decomposition that rendered them useless-tor further <br />study: one rotting carcass and two caudal peduncles). Also <br />included in the total recovered were four 'individuals in which PIT <br />tags could not be detected; these were re-tagged before release <br />into the lake (Table 3). Thus, 'only 1 adult (1%) among those <br />stocked into the Yuma Cove backwater remained unaccounted for when <br />the system was reclaimed in November. Presumably, this fish <br />perished as a result of natural causes and either sank to the <br />bottom of the backwater or was removed by scavengers; in either <br />instance it was unavailable for retrieval. <br />CONCLUSIONS <br />The 1992 experience of on-site propagation and rearing of razorback <br />sucker provided a number of new insights and approaches, and also <br />indicated certain constraints. Lake Mohave adults stocked into the <br />backwater were not only recovered and returned to the lake, they <br />0 also were augmented by a factor of 2.5 (females) to 5 (males) with