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<br />22 <br />over the same period when razorback sucker were hatching. <br />It appears that lake larvae are making the change from <br />endogenous to exogenous food and thus are in the critical period. <br />The amount of time they have to encounter suitable food is not <br />precisely known, but I have shown that at 180C they have <br />approximately 10 days after yolk sac absorption. While <br />patchiness of zooplankton may make a difference in providing <br />suitable densities of food, my results show that at a density of <br />5 organisms per liter mortality is about 90%. It is also <br />important to note that larvae captured in Lake Mohave are not <br />much older than 19 days (Langhorst and Marsh, 1986) and that in <br />all my experiments mortalities were greatest between 20 and 30 <br />days after hatching. These results indicate that food availabity <br />may explain the absence of larval fishes greater than 10.6 mm in <br />Lake Mohave.