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20 <br />This hypothesis is consistent with available data and provides <br />explanations for several observed phenomena. It also is untested, and <br />not without alternatives. <br />RECOMMENDATIONS FOR FURTHER STUDY <br />This work, in addition to enhancing our knowledge of larval <br />razorback sucker ecology, provides valuable guidance for future <br />investigation. Fulfilment of the following objectives will add <br />significantly to extant information: <br />1. Determine possible dispersal of razorback sucker out of Lake Mohave <br />by intensive sampling of the mainstream Colorado River immediately <br />below Davis Dam during periods of peak larval abundance in Lake <br />Mohave; <br />2. Determine depth, direction, and magnitude of down-reservoir currents <br />in Lake Hohave, and their potential role in dispersing sucker larvae <br />from known spawning areas; <br />3. Continue study of predation impacts on sucker larvae by: <br />a, repeat and expansion of digestion-rate experiments to include <br />additional predator species, especially threadfin shad and <br />rainbow trout, within a more complete experimental design, and <br />b. continue close-order sampling of predators in Lake Mohave during <br />periods of larval abundance; <br />4. Monitor razorback sucker in the Arizona Bay backwater during 1986 <br />(restocked with adults in December 1985), with particular emphasis <br />on larval growth and feeding;