NATURAL HISTORY OF THE QUINN AT SALMON. 
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and in the broad bay hardly strong enough for his guidance. Suppose that by the 
time he reaches Benicia, B , he has fallen behind the wave until he has the position 
at .s'. It is then slack low water, and he can make no headway. Soon the next 
wave reaches him and he is in flood tide. He will therefore swim back against the 
current. As the wave is going up the bay and he is going down, he soon gets past 
the crest and finds himself in the ebb tide at s". He then turns and stems the ebb 
tide, and as the wave is going in the same direction he is, he goes much beyond 
Benicia, B, before he again falls back to slack low water at s'", and gets into the 
flood of the next tide wave. 
There is no way of tracing the passage of the salmon through the bays, but from 
records made at Vallejo, Benicia, and Collinsville it seems to require about a week 
to reach the mouth of the river after they enter the Golden Gate. 
Plate 14 indicates the catch of fish at various places from Vallejo to Sacramento 
for a certain period, and is intended to show the passage of two schools between 
the two places. Each division of the diagram indicates the relative amount of 
salmon taken at the ten places during one day, the unit being the average daily 
catch at the given place. The vertical spaces indicate tenths of the average daily 
catch. By a careful study of the diagram the following points will be noted: 
On Monday, April 25, there were few fish taken anywhere, the catch being less 
than the average at all points. This is the more marked because the Monday 
catch is on an average 25 per cent greater than that of other days, on account of 
there being no fishing on Sunday. On Tuesday there was a big catch at Vallejo 
(3.0 times the average), and a slight increase at Benicia (1.1), Dutton (1.2), Black 
Diamond (1.2), and Collinsville (0.9). There was little or no increase at other points. 
On Wednesday, the second day of the run, the catch at Vallejo had fallen off, 
and by Thursday the run had entirely passed that point. The points on Suisun 
Bay and along the river as far as Isleton were gained on the second and third days, 
and the run reached Court land on Friday, the fourth day. There was no fishing at 
some of the upper stations on Saturday, that is, Friday night, the law prohibiting 
fishing from sunrise Saturday to sunset Sunday, and the record for the fifth day is 
incomplete. This run was two days in passing Vallejo, and four days in going from 
Vallejo to Courtland. 
On Friday, April 29, another run began passing Vallejo, the catch being over 
three times the average, and the next day it had increased to over six times the 
average. On Monday the Vallejo catch decreased to 1.9, on Tuesday to 1.7, and on 
Wednesday to 0.4, the run being five days in passing that place. This new run 
was not noticed at the other points on Friday, but on Saturday, the second day, it 
had reached all points up to Collinsville at the mouth of the river. By Monday, the 
fourth day of the run, it had reached all points from which we have records, the 
greatest increase being at the stations farther up the river. During the remainder 
of this week the catch continued to fall off at the lower stations, but continued very 
large at Sacramento. By Wednesday, the sixth day, it had passed Rio Vista, and 
Walnut Grove by the seventh. On Friday there was still a big catch at Sacramento 
(5.9) and at Courtland (3.8). The record is imperfect for Saturday as usual, but 
apparently the run had passed all stations. To summarize: This run was five days 
in passing Vallejo. The foremost were four days going from Vallejo to Sacramento, 
and the run was five days passing Sacramento. 
