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SUMMARY <br />By Fish <br />The major food items for endangered fish species were fish, invertebrate <br />remains, Diptera, and Ephemeroptera. Only endangered fish species consumed <br />fish. <br />YOY and Juvenile Gila sp. and G. robusta were opportunistic feeders <br />on most invertebrate food item categories. A predatory role is evident <br />because particulate matter (fine seston and coarser debris) was not present <br />in stomach contents. Plant macrofragments were also uncommon in stomachs of <br />YOY and Juvenile G. robusta. <br />Ptychocheilus was a predator on fish as well as on invertebrates. It <br />appears that, given the opportunity, YOY Ptychocheilus will select fish <br />(YOY N. lutrensis) as a major food item over invertebrates. Ptychocheilus <br />and N. lutrensis were present together at 7 strata, A, C, D, E, F, B. and G; <br />predation was evident at all except the latter two strata. Since Ptychocheilus <br />consumed 91.78% of the total fish consumed, there appears to be no other fish <br />which selected towards this food resource. <br />As can be seen in Figures 4 through 9, there appears to be diet overlap <br />for all species except perhaps Adult Killifish, YOY C. discobolus, and <br />Adult Pimephales. Adult Killifish ate only seston; YOY C. discobolus <br />consumed significantly more seston than all other fish species as well as <br />some plant macrofragments and Diptera; Adult Pimephales consumed seston, <br />macrofragments, invertebrates, and Diptera. <br />YOY C. latipinnis appears to be predominately an invertebrate feeder <br />or at least consumes large sized food items while YOY C. discobolus appears <br />to feed selectively on finer particulates. YOY C. latipinnis was the only