El 
especially Mr. Eınar Lea have, during the years 1907—1913, carried out a great number 
(some score thousands) of age determinations and growth measurements of herring, partly 
from the coast of Norway, as also from the Atlantic, Iceland, the Faroes, the North 
Sea, the Skagerak and the Kattegat. Some of the results thus attained have already 
been published*). Among other points, it has been found that the herring exhibited 
similar great fluctuations in the numerical value of the different year classes to that 
observed in the case of the haddock in the North Sea and Skagerak (vide supra). More- 
over, the very same year class, that of 1904, was found to be distinguished, both 
among the herring of the Norwegian coastal waters, and the haddock in the North Sea 
and Skagerak, by the very high percentage which it has furnished during the past years. 
The results hitherto published referred to the years 1907—1911. After a further period 
of two years’ work, during which time definite conclusions have also been arrived at 
in the case of the cod investigations, | have thought it desirable to give a new survey 
of the results up to date. I purpose, however, in the following, to confine myself to such 
matter as may serve to further elucidate the problem which forms the subject of this 
report, viz. the fluctuations in the fisheries. 
The great mass of material which has been collected, and on which the present work 
is based, will later be utilised for further publications, and for the discussion of other 
problems than that which is here principally dealt with, and to which | have devoted 
the greater part of my personal interest during the past years. 
*) Joman Hsort, Report on the Herring Investigations until January 1910; Publ. de Circ. 
No. 53. 1910. 
Jonan Hsorr and Einar Lea, Some Results of the International Herring Investigations 
1907—1911. Publ. de Cire., No. 61, 1911. 
NOTICE THIS MATERIAL MAY BE. - 
PROTECTED BY LAW 
(TITLE 17 U.S. CODE) 
