. The effect of altered streamflow on fish of the Yellowstone and Tongue rivers, Montana . 500 600 700 800 Fork Length (mm) 900 1000 Figure 6. Comparison of the 1975 and 1976 shovel nose sturgeon fork length frequencies (by percentage of catch) in the Tongue River. In 1974, 427 shovelnose sturgeon captured in the Tongue River were measured by Peterman and Haddix (1975). Since total lengths rather than fork lengths were recorded in 1974, their results were converted by the regression formula: TL = + FL where all measurements are in millimeters. The fork length range in 1974 was 4
. The effect of altered streamflow on fish of the Yellowstone and Tongue rivers, Montana . 500 600 700 800 Fork Length (mm) 900 1000 Figure 6. Comparison of the 1975 and 1976 shovel nose sturgeon fork length frequencies (by percentage of catch) in the Tongue River. In 1974, 427 shovelnose sturgeon captured in the Tongue River were measured by Peterman and Haddix (1975). Since total lengths rather than fork lengths were recorded in 1974, their results were converted by the regression formula: TL = + FL where all measurements are in millimeters. The fork length range in 1974 was 449 mm ( in) to 969 mm ( in) with an average length of 700 mm ( in). The length frequency of shovelnose sturgeon sampled downstream from the Intake Diversion on the Yellowstone River in the spring of 1975 was plotted and compared to the Tongue River sample for the same time period (Peterman and Haddix 1^75). Yellowstone River sturgeon ranged from 287-815 mm ( in), with an average length of 508 mm ( in). More than 50 percent of the sample fell in the size class 330-480 mm ( in) with the modal interval of 386-404 mm ( in). The length-frequency distribution of the Tongue River sample is compared to the Intake sample in figure 7. Sturgeon 27
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