— 23 - 



LATER STAGES OF GADOIDS 



In the case of Cod the general similarity of the phenomena in the separate years 

 makes it scarcely worth while to draw the mean curves for the entire period. Never- 

 theless, for the sake of completeness, I add such charts to our series (fig. 44 — 45). It is 

 interesting to compare them with those for haddock, and to note the simple and inter- 

 esting fact that they, so to speak, are precisely the reverse of the curves for haddock, 

 showing similar contours, but focussed about a point on the west or south-west of the 

 North Sea, while those for haddock are focussed about a point in the south-east. Just 

 as the large haddock had their maximum and the small their minimum off the Jutland 



Fig. 44. Percentage of Small Cod, 1906 — 10. 



Fig. 45. Percentage of Large Cod, 1906 — 10. 



coast, so the large Cod have their maximum (fig. 45), and the small (fig. 44) their mini- 

 mum off the eastern counties of England. 



III. Variation in the Average Catch in successive Years. 



a. Comparison of the Cacht of Haddock from Year to Year (Tables VI, VII). 



In my former report I showed, by means of a little chart, that, when comparing the 

 percentage increases or decreases in the catch of haddock in the two years 1906 — 07, 

 the regions of increase were easily separated from those of decrease by a curved line 

 running from the neighbourhood of Peterhead to the German coast. This chart is here 



