. Big Hole River Arctic Grayling Restoration Project annual report : 1992. Arctic grayling. jo»ir!'.v. Figure 14. Map of capture sites of young-of-the-year grayling captured in Summer and Fall surveys of the Big Hole River, 1992. Tributaries contributed considerable recruitment in 1992. In approximately miles of Swamp Creek that was surveyed, 94 YOY grayling were captured. The East Channel of the Wisdom Section, primarily influenced by Steel Creek, provided a catch of 87 YOY grayling. Neither of these tributaries was significantly influenced by irrigation withdrawals, and recruitment was
. Big Hole River Arctic Grayling Restoration Project annual report : 1992. Arctic grayling. jo»ir!'.v. Figure 14. Map of capture sites of young-of-the-year grayling captured in Summer and Fall surveys of the Big Hole River, 1992. Tributaries contributed considerable recruitment in 1992. In approximately miles of Swamp Creek that was surveyed, 94 YOY grayling were captured. The East Channel of the Wisdom Section, primarily influenced by Steel Creek, provided a catch of 87 YOY grayling. Neither of these tributaries was significantly influenced by irrigation withdrawals, and recruitment was ample. YOY grayling were captured in Deep Creek (7) and near the mouth of Fishtrap Creek (2). The extent of spawning runs in these tributaries is unknown, and will be investigated in 1993. Past catches of YOY grayling in the McDowell and Wisdom sections indicate the relative success of spawning between 1983 and present (Table 2). Extremely poor recruitment is in evidence for 1983, 1984, and 1985. The major decline in grayling density occurred from 1984 to 1986. The population stabilized near current densities after successful recruitment years in 1986 and 1989. Surveys were not conducted in 1988. Successful recruitment in 1989 is manifested in the number of Age III fish captured in 1992 surveys. In 1991, catch rates were poor in the McDowell Section, but similar to 1990 and 1992 catches in the 23. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Byorth, Patrick A. (Patrick Arthur); Fluvial Arctic Grayling Workgroup; Beaverhead National Forest (Mont. ). Dillon? : Montana Dept. of Fish, Wildlife, and Parks
Size: 1664px × 1502px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionamericana, bookleafnumber30, books
