Assessment And Requirements of Sauger And Walleye Populations in the Lower Yello
Assessment And Requirements of Sauger And Walleye Populations in the Lower Yello
Russell F Penkal
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6°C colder than mean April temperatures in the Tongue River. During April, water temperatures usually peaked from noon to 3 p. M. In the Yellowstone and declined to a minimum between midnight and 6 a. M. In the Tongue and Powder rivers, however, the cycle was reversed; water temperatures did not peak until midnight and then declined to minimums between noon and 3 p. M. This makes the difference in water temperature between the tributaries and the mainstem even greater (a mean difference of 5°C ...warmer in the two tributaries) during the time of day when sauger migration is probably greatest (evening and night) . Streamf lows Sauger spawn when flows are relatively stable in the Tongue River - the period after peak lowland runoff and before mountain runoff. Flows in the Tongue River during 1976-1979 (years when numbers of mature male sauger entering the Tongue River were similar) ranged form 370 to 720 cfs and was generally above 440 cfs (Table 22, Figures A-23, A-24, A-25, and A-26) . The discharge 95 £ 'H e C o u c Q) -P -H
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