g 



By the middle of the second month, when the water had become clear 

 enough to watch the young salmon from the bank, it was found that 

 they retained their positions in the current for hours without moving 

 down stream even for a few feet. In one instance an albino (one with- 

 out color) kept one position for three days, after which it could not be 

 found either above or below its old position. These facts all tend to 

 show that there was a decided movement of the salmon down stream 

 during the first month, and after that time they moved out much slower. 

 It probably took the rains of the next winter to drive them all out. 



We tried another experiment. By stretching a net across a narrow 

 place near the mouth of Paper Mill Creek as the tide was coming in, 

 it was demonstrated that the salmon play back and forth with the 

 tide before passing into salt water, as they repeatedly ran into the net 

 ahead of the tide when it was fixed in this way. 



In all of the streams except Hatchery Creek the fry were 



MOVEMENT planted where they could easily move up stream two or 



UP three miles if they so desired. The streams were care- 



STREAM. fully seined above the planting places to determine to 

 what extent they moved up stream. In Nicasio Creek 

 only a very few had moved up, and they had gone but a fourth of a 

 mile above where they were liberated. We found a few in Olema Creek 

 a fourth of a mile above where they were planted. In Paper Mill Creek 

 I found that none had moved up stream. All of the side streams were 

 seined to see if the fry had entered any of them, but it was found that 

 they had entered only one a very small stream fed by springs flowing 

 into lower Hatchery Creek. The water in this small stream was much 

 colder than the water in the creek and was grown full of water cress. 

 Nearly a hundred of the fry had entered this arid were found as far up 

 as they could get. Some had even found their way through a perfect 

 mat of grass and drifted rubbish. The current in this stream was very 

 slow, and it entered the creek at such an angle that it was a sort of trap, 

 and I have no doubt the fry got in there in trying to get down stream. 

 Although some of the fry do work up stream for a short distance, they 

 are the exception. Why they move down stream we do not know, and 

 we will have to credit it to instinct. A young steelhead or other trout 

 when frightened prefers to dart up stream rather than down, and if one 

 wades down stream and attempts to drive them before him he will find 

 that they will not drive, but will dart between his legs or around him in 

 their frantic efforts to get up stream. Knowing this trait of the fish, 

 in seining for them the net is always hauled down stream. With the 

 salmon fry it is different when frightened they will run even more 

 readily down than up stream. By walking along a small stream they 

 can be driven either up or down. In seining for them they are caught 

 as readily by seining against the current as with it. 



