orally a peaJc count two days following a low riyer temperature. Fish 

 of the summer migration are in fairly good condition* They have no 

 ■visceral fat, but their flesh is qxdte red and firm. Few of these 

 salmon will strike a lure; however, they are quite noticeable in the 

 larger holes along the river between North Fork and Trinity Center. 

 It is possible that the summer run at Lewis ton is a late or delayed 

 portion of the spring run which, having stopped migrating early in the 

 season, is forced to move upstream to escape high sumner water tem- 

 peratures* 



Fall-run salmon reached Lewlston about October 1 in 1944, and 

 once they begaa to arrive, the number counted each day increased 

 rapidly. After the initial surge, "waves* of migrants passed through 

 the counting gates until a seasonal peaJc in daily count was reached 

 November !• This peak accompained the first sustained rain and river 

 flow increase of the season. A second stona and subsequent rise in 

 river flow forced removal of the counting weir on November 3. The 

 counted portion of the fall run of 1944 amounted to 8,124 fish. The 

 fall ran of 1945 reached Lewis ton at about the same time in October 

 as did the 1944 run. It also passed through the ooimting g^tes in 

 successive "waves" which culminated in a peaJc daily count of the 

 season on October 29. This peak count also coincided with the first 

 sustained rainstorm of the season which continued in intensity and 

 forced removal of the weir on October 30. Fall-run salmon counted 

 in 1945 totaled 6,612 at the time operations ceased. 



The fall migration is the largest 9iid most noticeable. Many of 

 these fish will take the fisherman's lure, and, as a result, they 

 support a heavy sports fishery. IBieir flesh is quite pink and readily 

 distinguishable frran that of the fish in the two earlier migrations, 

 which is almost white by the time the fall migration starts. These 

 salmon can also be distinguished from fish of the two previous migrations 

 because their gonads are not fully mature while the other fish have 

 begun spawning. Since these fish mature later, many of them are able to 

 enter smaller tributaries after the first fall freshets. 



Obviously, the total annual number of adult salmon passing Lewiston 

 was greater than the 9,925 counted in 1944 and the 7,510 in 1945. It is 

 believed, however, that the number of salmon passing Lewiston was not 

 much greater than 120 percent of the number counted. If such is assumed 

 to be the case, then t\je 1944 run would have totaled about 12,000 and the 

 1945 run about 9,000. 



Spawning and development 



The first spawning activities of the spring and summer salmon are 

 noticeable along the river between Grass Valley Creek and Stuart Fork 

 during the first week of October. By the middle of that month, spawning 

 fish can be seen on every suitable riffle in this area, and scattered 



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