GROWTH RATE IX PACIFIC SALMON 



Stream Type. 

 Three year Class. 

 Length 17 17-5 18 18-5 19 19-5 20 20-5 21 21-5 22 22-5 



3 2 

 3. 



2 2 

 .. 2 



2 1 



3 6. 



1 



Number — Male. 



Female 



Average length, male, 18-9; female, 20-3; total, 19-5. 



Four year Class. 



Length 22 22-5 23 23-5 24 24-5 25 25-5 26 26-5 27 27-5 28 28-5 29 29-5 



Number— Male 1 2 1 1 3 1 3 1 3 1 1 2 1 2 



Female 1 3 1 4 3 1 8 2 3 1 



Average length, male 26-1; female 26-2; total 26-2. 



Five year Class. 



Length 28-5 29 29-5 30 30-5 31 31-5 32 32-5 33 33-5 34 34-5 35 35-5 36 36-5 37 



Number— Male 1 2 1 1 1 1 .... 1 1 



Female 2 1 1 1 3 2 1 1 1 2 



Average length, male, 32-4; female, 32-4; total, 32-4. 



Six-year Class. 



Length : 35 37 39 40-5 



Number — Male 1 1 1 1 



Average length, 37-9, 



As the period of collection of these salmon extended over three months this may 

 have increased the normal spread between limits for each year but as the period of 

 rapid growth was well over before the first collecting was d^one this would not make 

 so much difference as if it had been done earlier. In any case the conditions were 

 similar for male and female and hence there should be the same ratio in length as 

 if they had all been taken at the same time. In the sea type in every year class the 

 male average is distinctly greater than the female average. In the stream type the 

 two averages are very similar, but what difference there is is in favour of the female. 



The rate of growth as calculated by years is shown in the following table: — 



TAHLE OF GROWTH. 

 Sea Type. 



Stream Type. 



length for the incompleted year is recorded. It is evident that while the period of 

 most rapid growth was over when the collection started, there must still have been 

 time for a noticeable increase before the growth of the year was complete. As the 



