spawning Ocours upriver to the East Fork and dovmstream to the North 

 Fork, Spawning in this stretch of the river reaches a peak during 

 the first two weeks of November when many of the fall-run fish are 

 also depositing their eggs. During the course of the investigations, 

 high waier flow and turbidity prohibited observation of main river 

 spawning after the first week of November, although spawning is known 

 to occur long after that date. Salmon that had recently died following 

 spawning, and a few living fish, have been seen as late as December 19 

 near Lewiston. Three freshly spent saLnon were found dead near Lewis ton 

 in February 1946. Salmon start to spawn in the Trinity Center area during 

 the first two weeks of November, and a peak in the spawning activity is 

 reached during the last two weeks of that month. Spawning salmon have 

 been observed as late as December IE near Trinity Center. 



King salmon fry begin to emerge from the river gravels during 

 January. Iftidoubtedly, the first fry to appear are offspring of the 

 spring and summer adult runs which spawn some four to six weeks ahead of 

 the fall-run adults; however, no distinction between the hatching times 

 of the separate rtins can be detected from fyke-net catches after the 

 emergence is well underway. The movement of salmon fry from their nests 

 continues fr<»n January through May, as indicated by results summarized 

 in Table 10. The appearance of undeveloped fry serves as a rough index 

 to the emergence periodj however, nets placed directly downstream from 

 salmon nests took very few yolk sac specimens, which demonstrates that 

 young, not fully developed as they leave the nest, are the exception 

 rather than the rule. 



Seaward migration 



Seaward migration begins to intensify in March (Figure 6, Table 11), 

 usually reaches a peak in May and Jltne, continues until the first half 

 of July, and practically ceases by the first of August. The main 

 migration takes place during the spring run-off period and is only 

 generally influenced by fluctuations in water flows or temperatures. 

 Migration ceases in early sixsimer as the river becomes low and its 

 average temperature ranges into the seventies. The greatest numbers 

 of migrants for each year of observation were taken in May of 1943 and 

 1944, April of 1945, and June of 1946. 



Figures in Table 11 do not indicate the actual size of the seaward 

 migration, eind, therefoire, the results obtained in one year cannot be 

 compared dir«ctly with those of another. Quantitative evaluation of 

 fyke-net catches as indices of the total nvuaber of migrants is very 

 difficult. Too many variables, as location of the net, stage of water 

 flow, current, debris, and other factors, change the fishing success 

 each day. The only certain value of the fyke-net records is to show 

 the periods of seaward migration and their relative intensity during 

 different seasons of the year. 



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