of the Fishery Board for Scotland 



305 



Table XXVIII. gives the relative length of the dorsal fin to the body 

 length. The extremes of variation of the length of the fin among the winter 

 fish affects a larger number than among those of the summer season. Not- 





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Ratio of Fin 

 Length. 



mm. 

 150 to 169 



170 to 189 



190 to 209 



210 to 229 



230 to 249 



Percentage of all 

 Lengths. 



•Xpog jo T$avL9j 



withstanding this, the majority of the winter fish have a slightly larger fin 

 than most of the summer herrings. There is a tendency towards increase 



