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Natural Spawning Success of Landlocked Salmon, Salmo salar
Author(s) -
Warner Kendall
Publication year - 1963
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1963)92[161:nssols]2.0.co;2
Subject(s) - salmo , fishery , biology , silt , fish <actinopterygii> , predation , aquaculture , environmental science , zoology , ecology , paleontology
During 1959‐61, 33 landlocked salmon redds containing 24,712 eggs were excavated in two spawning areas of the Fish River Lakes to evaluate survival of naturally spawned eggs. Depth of egg deposition averaged 8 inches and ranged from 4 to 12 inches below the redd surface. The average number of eggs per redd was 749. Total egg survival to the late eyed stage averaged 93.2 percent. Average egg mortality was 4.2 percent in the pre‐eyed stage and 1.7 percent in the eyed stage. Loss due to nonfertilization was less than 1 percent. Analysis of the texture of redd materials showed that 75 percent were larger than 0.25 inch, and only 12‐14 percent were larger than 1.5 inches. Sand comprised 16‐17 percent of the redd materials. Egg survival was apparently not affected by the amount of sand, silt, and clay in redd materials. High survival of salmon eggs in the area studied is favored by a relatively stable stream flow and lack of severe ice conditions. Superimposition of redds is not considered to be a serious factor in egg mortality.