The effect of altered streamflow The effect of altered streamflow on fish of the Yellowstone and Tongue rivers, Montana effectofno8alteredyellow1977rich Year: 1977 TIME OF SPAWNING In 1975, the first sturgeon was collected on May 9, with large concen- trations appearing around May 21 (figure 12). The last sturgeon was collected on August 7, although sampling continued until August 10. The first ripe male (one from which milt could be stripped) was taken on June 3; no ripe females were caught in 1975. Internal examination of two sturgeon on July 10 revealed a few black eggs remaining in. the
The effect of altered streamflow The effect of altered streamflow on fish of the Yellowstone and Tongue rivers, Montana effectofno8alteredyellow1977rich Year: 1977 TIME OF SPAWNING In 1975, the first sturgeon was collected on May 9, with large concen- trations appearing around May 21 (figure 12). The last sturgeon was collected on August 7, although sampling continued until August 10. The first ripe male (one from which milt could be stripped) was taken on June 3; no ripe females were caught in 1975. Internal examination of two sturgeon on July 10 revealed a few black eggs remaining in. the body cavity. It was assumed that these fish had spawned in the Tongue River. 7000-1 6000- 5000 ^ 4000- _ 3000- 2000- 1000- 1000 2000 3000 4000 5000 Weight at Tagging (g) 6000 7000 Figure 11. Linear regression analysis of the weight at tagging (before spawning) compared with the weight at recapture (after spawning) of shovelnose sturgeon in the Tongue River. 35
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