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13 <br />Fecundity <br />Female flannelmouth and bluehead suckers were sacrificed to <br />determine fecundity during April, May and June of 1975 and 1976. Total <br />and fork lengths were measured to the nearest millimeter; weight was <br />determined to the nearest 20 g for fish greater than 200 g and to the <br />nearest gram for fish less than 200 g. The ovaries were removed, <br />identified with a numbered tag, wrapped in cheese cloth and preserved <br />in 10% formalin. <br />In the laboratory, the ovaries were soaked in water to remove <br />the formalin, blotted to remove excess moisture and the eggs were <br />separated from the ovarian tissue. Fecundity was estimated gravi- <br />metrically using a triple-beam balance. Samples from the anterior, <br />mid and posterior sections of the ovary, totaling approximately 10% <br />of the entire ovary weight, were weighed to the nearest 0.1 g and <br />counted. The rest of the ovary was weighed and the fecundity estimated <br />by proportion. The accuracy of the method was determined by total <br />counts of all ova from two fish of each species. <br />Diameters of preserved, mature ova were measured to 0.01 mm with <br />an ocular micrometer. Ova from the anterior, mid and posterior <br />sections of the ovary were mixed, and 30 maturing eggs were chosen <br />from the group. These eggs were measured and the average value was <br />used as the ova diameter for that fish. There was no consistent <br />difference in ova diameters from the three sections of the ovary when <br />compared by analysis of variance. <br />The total length-fecundity relationships for bluehead and flannel- <br />mouth suckers were described with the logarithmic equation [Bagenat,