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<br />~? <br /> <br />fishes. This document provides a strategic plan for guiding control <br />measures in the Upper Colorado River Basin. Lentsch et .al. (1996) <br />reviewed most of the control measures suitable for use with nonnative <br />fishes in the Upper Colorado River Basin that included mechanical <br />techniques (traps, nets. seines, and electrofishing). chemical removal <br />(i.e., poisons), biological techniques (introducing predators). and <br />altering flow regimes. <br /> <br />The goal for nonnative fish control or management in the Upper Colorado <br />River Basin is to reduce the adverse impacts of nonnative fishes on the <br />endangered fishes. It is not likely that nonnative fishes that have <br />become established in the Upper Colorado River Basin can be eliminated. <br />However. preventive measures and active control programs could be <br />implemented to reduce the abundance of nonnative fishes in riverine and <br />adjacent floodplain habitats. Consequently. then. reducing the <br />abundance of nonnative fishes would reduce the potential for predation <br />and competition on endangered fishes. <br /> <br />IV. Study Goals, Objectives. End Product: <br /> <br />Purpose <br /> <br />This SOW will satisfy two RIPRAP action items simultaneously: 1) <br />evaluation of gravel pits as ephemeral, floodplain habitats for adult <br />Colorado squawfish and other native fishes. and 2) removal and disposal <br />of nonnative fishes from these same ponds. In other words. restoration <br />and evaluation of this type of floodplain habitat for native fishes <br />will be conducted concurrently and integrated with capturing, removing, <br />and disposing of problematic nonnative fishes that affect the survival <br />and recovery of endangered fishes. <br /> <br />Sloped. gravel-pit ponds would create ephemeral habitats during the <br />spring and early summer. Sub.adult and adult nonnative and native fish <br />that usually reside in the river during non runoff conditions may be <br />attracted to these floodplain ponds for shelter to avoid high river <br />velocities associated with runoff. . Fish may also seek the warmer water <br />temperatures of these off.channel. ponded habitats during spring runoff <br />for growth and reproduction. These types of habitats may concentrate <br />nonnative fishes for short periods of time and may increase capture and <br />removal efficiency. <br /> <br />b <br />