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250 <br />Birch Creek U T <br />~ ---- Strawberry River UT <br />~ _ Tributories to Priest Lake ID <br />- Flint Creek MT <br />_ ~ _. <br />~ ~./. <br />~ ' <br />2 150 , ~ ~~ <br />W ~ ~ <br />J ~ <br />i <br />i . j, <br />J '' <br />Q ~'~ / <br />H <br />O < ' <br />H ~ ~ <br />n' i <br />50 ~ j <br />I 2 3 4 5 <br />ANNULI <br />Figure 9. Comparison of the growth in various populations of cutthroat trout from streams in the Inter- <br />mountain West. <br />Table 5. <br />Mean calculated total length at the end of each growing season for cutthroat <br />trout from Birch Creek, Utah. <br />Age <br />Group Number <br />of Fleh Mean calculated total length at each annulus (mm~ <br />1 2 3 4 <br />Females <br />I 1 96.4 <br />II 11 98.9 131.4 <br />III 16 92.2 133.9 158.1 <br />IV 1 83.0 136.6 173.4 200.2 <br />Mean length 94.6 133.0 159.0 200.2 <br />Increment of growth 94.6 38.5 25.0 26.8 <br />Number of fish 29 28 17 1 <br />Males <br />I 25 B0.0 <br />II 7 62.5 101.1 <br />III 4 70.2 112.2 141.5 <br />IV 2 82.9 141.5 182.2 205.1 <br />Mean length 75.9 110.7 155.1 205.1 <br />Increment of growth 75.9 42.7 33.1 22.9 <br />Number of fish 38 13 6 2 <br />Sexes combined <br />I 26 83.9 <br />II 18 81.5 118.9 <br />III 20 79.9 128.6 157.8 <br />IV 3 80.6 135.2 173.0 196.8 <br />Mean length 81.9 124.8 159.8 196.8 <br />Increment of growth 81.9 44.2 30.3 23.8 <br />Number of fish 67 41 23 3 <br />17 <br />