umge: 
Skagerak and Kattegat. 
Turning now to a consideration of the herrmg in the Skagerak, we find that the 
conditions are here even more complicated. We find in the Skagerak the Norwegian 
herring, the autumn spawning ocean herring of the North Sea Banks, local spring spaw- 
ning coast herring, and also, in the Kattegat and the Belts, probably a distinct autumn 
spawning variety. Such complicated mixtures as may here arise are hardly to be pro- 
perly sorted out in all cases save by extensive study of the race and growth. Some general 
features may, however, be indicated, even with the methods hitherto employed. 
The table on page 70 shows the composition in point of age, and the degree of 
as He SA 
Langesund 
Sun ASE Pater ae 
foe = = D DT 
Fig. 41. Skagerak and Kattegat, showing locality of capture of the samples 
noted in the table on p. 70. 
maturity of the genital organs for a number of samples taken in the years 1910 and 
1911. The chart Fig. 41 shows where the samples were taken. 
The Norwegian spring herring showed, as already mentioned, in 1910 and 1911, 
over 70 % of the 1904 year class. In the Skagerak, however, these appeared only as 
a more or less faint admixture among the other varieties, as for instance at Risor (sam- 
ple 1) and Bohuslän (No. 3). 
The autumn spawning ocean fish of the North Sea Banks, especially those spawning 
in the south-eastern corner of the North Sea and the Skagerak, move in the winter, as 
HEINcKE has shown, in to the Skagerak. Samples 3 and 4 from February and January 
1910 exhibit a composition in point of age which strongly resembles that of the autumn 
spawning North Sea fish. The same applies to the sample from the Jutland Bank, July 
