of the Fishery Board for Scotland. 



99 



APPENDIX IV. 



NOTES ON THE LENGTH MEASUREMENTS OF UNSPAWNED 

 SALMON AND GRILSE "MARKED" IN NOVEMBER 1903. 



By H. W. JOHNSTON. 



In Appendix IY. of the Twenty-first Annual Report, a Table was 

 given to show the proportions of males and females among the un- 

 spawned salmon and grilse netted and "marked" in November 1902. 

 These fish were arranged in groups according to their lengths, and in 

 a second Table corrections were made for the estimated increase in the 

 measurement of males, due to the growth of the snout in the spawning 

 season. 



During November 1903 experimental netting was again carried on, 

 and 361 unspawned salmon and grilse were marked between Stanley 

 and Perth, and the results, brought out by an analysis on the basis 

 adopted in the second Table above referred to, are very similar to those 

 of the previous year. 



Numbers and Percentage of each Sex — November 1903 (corrected 

 for growth of Snout). 



Group. 



Length. 



Number. 



Percentage. 



Remarks. 



M. 



F. 



Total. 



M. 



F. 



1 



2 

 3 



26 inches and under, 

 26J to 27 inches, 

 27| to 31^ inches, - 



35 

 17 

 29 



84 

 15 

 12 



119 



32 

 41 



29 

 53 

 71 



72 

 47 

 29 



Chiefly Females. 

 Mixed Sexes. 

 Chiefly Males. 







81 



111 



192 



42 



58 





4 



5 



32 to 37 inches, 

 37J inches and over, 



11 



33 



119 



6 



130 

 39 



8 



85 



92 

 15 



Chiefly Females 

 Chiefly Males. 







44 



125 



169 



26 



74 







Total, - 



125 



236 



361 



35 



65 





II 



