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16 <br />occurred throughout the reservoir. Several small coves across from <br />i. . <br />Cottonwood Landing in the Painted Canyon contained remarkably high <br />numbers of razorback suckers. Spawning occurred over submerged areas of <br />eroded gravel talus. The Three Mile Flat area on the Arizona shore of <br />the Cottonwood Basin contained spawning razorback suckers, but it was <br />difficult to survey this area due to extensive inundated terrestrial <br />vegetation. This area probably contained more razorbacks than indicated <br />by the survey map. The Windmill Coves area (southeast of Carp Cove) was <br />netted for brood stock in January 1982 by the USFWS, but no razorbacks <br />were apparent in this area at the time of the cove survey. Spawning has <br />also been reported from below Hoover Dam (Gustafson 1975b). This area <br />was not included in our survey.-Many other locations contained various <br />sized local populations while some areas of the reservoir were not <br />surveyed at all. The areas and numbers presented in this cove survey are <br />therefore believed to be very conservative estimates of the total number <br />in the reservoir. <br />Razorback suckers were by far the most abundant species observed in <br />these spawning areas (Appendix 2). Other fish species were rare <br />throughout the areas surveyed. Carp were observed in the spawning areas, <br />but their numbers were low and they were usually more abundant in <br />siltier coves not being used by razorback suckers. <br />4.2 Catch rates <br />The razorback sucker was the dominant species in the trammel net <br />catches from most areas of Lake Mohave prior to May (Appendix 3) (Fig. <br />3-5). Razorback sucker catch rates (N fish/ 100 m2 net/ 24 hrs) were <br />high in the Arizona Bay and Six Mile Coves area during winter months <br />(Appendix 3)(Figs. 3-5). Razorback sucker catch rates were also high in