SALMON AND TROUT IN ALASKA. 



91 



In the number of tubes in the lateral line (table 9) no great local 

 variation was found, the averages varying from 132.1 to 135, with 

 extremes 126 and 143. The value of this count is somewhat lessened 

 by the varying degree to which the tubes extend on the caudal. 

 This does not imply that all the high counts are due to tliis; in some 

 instances liigh counts are due to the finer scaling. In other cases 

 even low counts continued well on to caudal. The averages for the 

 different years, however, show a striking similarity. The maxima 

 vary from 132 for Karta in 1904 to 135 for Dolomi in 1903, but 

 mostly fall on 133. 



Table 9. — Tubes of Lateral Line. 



In table 10, showing rows of scales, it will be seen that the counts 

 for 1903 regularly fall below those for 1904. This is due to the vary- 

 ing procedure regarding the fine rows in front of dorsal and ventral 

 fins, where the counts w^ere initiated. A considerable variance is 

 thus introduced. The branching of the rows under the front of the 

 dorsal also affected the accuracy of the count. In some specimens a 

 few scales' difference in the point at which this branching occurs 

 adds or excludes a row in the count, which was made for the top 

 rows from front of rayed dorsal down to lateral line, and for lower 

 rows from front of ventrals up to lateral line, the lateral row being 

 included in the total. 



Table 10. — Rows uf Scales. 



Locality. 



Doloini. 



Kegan . 

 Karta. 



1904 

 1903 

 1904 

 1903 

 1904 

 1903 

 1904 

 1903 

 1904 

 1903 



Nowiskay I 1904 



1903 



Quadra. 

 Yhs Biiv 



Date. 



Num- 

 ber 

 exam- 

 ined. 



Aver- 

 age. 



511 

 200 

 511 

 100 

 512 

 420 

 512 

 496 

 509, 

 300 

 513 

 100, 



Percentage of fish with specified numbers of rows of scales- 



38 39 40 41 42 43 44 45 46 47 



L3 6. 

 3. 5 16. 



.6 3. 

 2.0 1. 



.4 1. 



.2, 3. 



.6i .8 



1.3 



11.5 

 21.5 

 10.0 

 13.0 

 4.3 

 13.3 

 6.2 

 6.0 

 3.9 

 10.3 

 3.3 

 9.0 



18.5 

 24.0 

 14.0 

 21.0 



9.7 

 19.3 

 10.3 

 11.3 

 10.6 

 17.6 



8.7 

 27.0 



1120.5 11. 

 5 9.0 3. 

 7 22.5 16. 



23.0 15. 



1 25. 24. 

 120.9 14. 

 222. l! 19. 

 8)24. 4'20. 

 5jl7. 4I2I. 



23. 6 12. 

 19. 3 18. 

 17.0 9. 



5.6 

 1.0 



8, 



3.0 

 12.3 



8l 7.1 

 3,13.1 

 4| 9.3 

 2|16. 6 

 6; 6.6 

 9 19. 1 

 Oi 2.0 



1.9 

 .5 

 3.5 

 1.0 

 3.9 

 3.3 

 7.5 

 5.2 

 8.4 

 3.0 

 11.1 

 3.0 



49 50 51 52 



0.2 



