. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. NOTES 187 were mature and capable of spawning. Operational considerations precluded trapping all upstream migrants at Snow and Salmon creeks, so it is not possible to determine the magnitude of the run or the relative abundance of the two groups. 1100 1000 900 800 B 700 X O 600h z UJ ^ 500h oc O (/> 400 300 200 100 Cumulative Growth (Ago - ) ,° /' FL={1 - e ) ^ (From Collins 1982). Annual Increment 160 150 140 130
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. NOTES 187 were mature and capable of spawning. Operational considerations precluded trapping all upstream migrants at Snow and Salmon creeks, so it is not possible to determine the magnitude of the run or the relative abundance of the two groups. 1100 1000 900 800 B 700 X O 600h z UJ ^ 500h oc O (/> 400 300 200 100 Cumulative Growth (Ago - ) ,° /' FL={1 - e ) ^ (From Collins 1982). Annual Increment 160 150 140 130 120 110 100 90 80 70 60 50 40 30 -20 10 z c > r- O 3} o z o 3] m 3 rti z 3 3 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 YEAR/ANNULUS FIGURE 1. Length frequency distribution for adult lampreys captured in traps on Snow and Salmon Creeks. Downstream migration of adult lampreys has also been documented by Washington Department of Game personnel operating downstream migrant traps on the Kalama River system in southwest Washington. In 1979, Chilcote, Leider, and Crawford (1980) estimated over 7,000 adult lampreys moved down- stream. The 1981 estimate for Kalama River was greater than 13,000 (S. Leider, Wash. Dept. of Came biologist, pers. commun.). Leider indicated that most of these fish were in good condition when captured in the Kalama River. Washing- ton Department of Fisheries biologist D. Seiler (pers. commun.) has also trapped downstream migrating "adult" Pacific lampreys in some Puget Sound streams. The general appearnace and size of fish were similar to that observed in Snow and Salmon creeks. Several questions have been put forth by other individuals concerning the report of repeat spawning by Pacific lamprey. John Heinrich ( Dept. of Interior biologist, Marquette, Michigan) suggest- ed that the marks observed on the returning adults were natural. In his experi- ence with sea lamprey, Pteromyzon marinus,
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