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<br />24 <br /> <br />in the 1990 biological opinion. The effects of the proposed change in <br />operation of Wolford Mountain to utilize the expanded storage volume were <br />analyzed by the River District. Table 3 displays the total change at Cameo <br />with an average annual depletion of 13,485 acre-feet. <br /> <br />The physical and biological features that were the basis for designating the <br />critical habitat for the endangered fishes are water, physical habitat, and <br />biological environment. These primary constituent elements were determined <br />necessary for survival and recovery of the endangered fishes in the Colorado <br />River. The primary constituent element water is described as .a quantity of <br />sufficient quality and with a hydrologic regime that is required for each life <br />stage. Physical habitat includes areas of the river that are inhabited or <br />potentially habitable by endangered fishes for use in spawning, nursery, <br />feeding. and rearing or corridors between these areas. Biological environment <br />includes food supply, predation, and competition. <br />