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0 5 <br />METHODS <br />The Yuma Cove backwater was stocked on 27-28 January 1992 with ripe <br />adults (28 females and 60 males) captured from the adjacent Lake <br />Mohave shoreline (a full report on that operation is available by <br />request). At the time of stocking, 29% (8) of females and 880 (53) <br />of males were ripe. <br />_. <br />Monitoring commenced in mid-February, and consisted initially of <br />sampling using hand-held spotlights, which were known to attract <br />the phototactic sucker larvae thereby allowing capture with fine- <br />mesh dip nets. Light traps, however; were experimentally shown to <br />be more convenient and efficient than spotlights. These traps were <br />thus adopted as the standard larval sampling technique (application <br />of this method is reviewed by Mueller et al., in preparation). <br />Light trapping also revealed an unanticipated density of predatory <br />odonate larvae in the backwater, which led to an independent, <br />experimental examination of their potential impact on razorback <br />sucker recruitment (Horn et al., in preparation). As fish grew, <br />seining, entanglement netting, traps, and other techniques were <br />variously applied in attempt to collect adequate samples to assess <br />cohort status. <br /> Fish marking (right pectoral fin clip) to enable population <br /> abundance estimation was initiated on 16 June and continued until