CANADIAN FISIHERIEfi EXPEDITION, lOUf-lS 



141 



Table 22. — Showing averages for growth dimensions /, — f^ for the year class 1907 in five 

 samples from Northumberland Strait, 1914-1915. At the foot, total averages and 

 their standard errors. 



Locali'y and Date. 



Northd. Strait, May 1914 34 



Baie Verte, May 11, 1914 17 



Pictou Harbour, May S, 191.5 17 



Richibucto, May 19, 1915 2fi 



Bale Verte, May 22, 1915 16 



Averagfs for the two samples from 1914 together. 



Standard errors •< i< u 1914 n 



Average><for the three samples from 1915 .■ 



Standard errors i. „ •■ 1915 h 



No. of 

 individ- 

 uals. 



Total averages. 



10 4; 



8-70 



3 99 



2 49 



2 54 

 2 35 

 2 44 

 2 74 

 2 50 

 OO' 

 2 50 

 0< 



2 50 



•57 

 •56 



69 

 •57 



56 

 ■57 



Of; 



60 

 04 



1 43 

 142 

 1 .30 

 140 

 1 39 

 1 43 



1 37 



I 59 



1-39 



114 

 124 

 118 



1 19 



119 



It will be seen from the tables that there is certainly a considerable degree of 

 similarity between all the samples ; there are, however, also differences which seem, 

 despite the small number of specimens, to be by no means negligible. Thus, sample 

 11 differs in its small /, in the 1903 year-class, and Northd. Strait sample in the 

 same manner as regards the 1907 year-class. In order to test the value of these 

 deviations, the method adopted in the case of the Newfoundland samples was also 

 applied here, all possible differences (D) between samples two and two were taken 

 (for growth dimensions of like character) and the corresponding standard errors of 



the differences (d) formed; and finally, the fraction 7 obtained. It was then found. 



as will be seen from table 23 that the value of 



in one case out of fifty, is 



greater than three. This single difference, of considerable magnitude in proportion 

 to its error, occurs between samples and for the growth dimension /i. Save for this 

 single instance, all the differences are relatively small, being here, as in the New- 

 foundland samples, in the majority of cases less than twice their error. 



Table 23. — Showing distribution of values of -^ for all possible comparisons between 

 the five samples from Northumberland Strait. (Year class 1903, t^ — ^5). 



As the remaining growth dimensions likewise show considerable similarity between 

 the various samples, we must conclude that there is no essential difference, as far as 

 the good year-classes are coiaicerned. With regard to the remainder, these show, 

 as will l>e seen from table 24, considerable resemblance to the two more closely 

 examined. These last may therefore be taken as representative of the samples when 

 comi>aring them with samples from other waters. This will accordingly be done, 

 the 1903 year-class being used in cases where it is desirable to have older fish, and 

 1907 where younger are i)referable for purposes of comparison. 



