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<br /> <br />3 <br />variable ration size on mortality and growth. In Part II, experiments <br />were conducted in earthen ponds to more closely resemble a natural <br />situation. I report the effect of food abundance on survival and <br />growth of the razorback larvae under pond conditions and also describe <br />the kinds of foods eaten. <br />Based on these studies, and lanited erivirormtiental data from, Lake <br />Mohave, there is some evidence that food may be limiting for razorbacks <br />suckers in Take Mohave. Larvae hatch early in the year when food is <br />generally scarce. Of larvae examined from Lake Mohave, many had empty <br />stomachs or few food items in them (Marsh and Tanghorst 1988) compared <br />with ale-aged larvae in pond experiments. However, starvation <br />or food-related problems does not seem a likely explanation at the <br />highest recorded zooplankton densities in the reservoir, unless only a <br />small percentage of available organisms were of an appropriate size. <br />