— 21 



LATER STAGES OF GADOIDS 



shores of the North Sea. In other words the chart invariably shews contours more or 

 less definitely convex towards the east, with a focus in the eastern counties of England 

 (fig. 36-40). 



In the case of small Cod the percentages in 1906 and 1907 were on the whole small, 

 more or less uniform, or scattered somewhat irregularly over the map. I have not vent- 

 ured to draw contour charts for either of those years. In 1906, however, the usual mini- 

 mum is apparent in the south-eastern corner, where A3 had 13°/o and B4 17 °/o. Save 

 for the comparatively unimportant fishing in Ai .and D 3, which showed 17 and i8°/o 



Fig. 38. Percentage of Large Cod, 1908 



Percentage of Large Cod, 



respectively, all the other areas on the map show percentages varying from 20 to 34; 

 C l, C3 and D 1 being the areas where the proportion equalled or exceeded 30°/o. In 

 1907 the chart is still more irregular, D 2 showing a minimum of 14, approached by B l 

 and B4 with 17 and 18 respectively; while Cl nnd C3 show a maximum amount of 

 30 °/o in each case. 



For the three remaining years (fig. 41—43), however, there is little difficulty in 

 showing the distribution of small Cod by means of contour lines, and in each case we 

 have pretty much the converse of what we have shown for large Cod, namely a maximum 

 off the east or south-east of England, and successive contours about a focus in that 

 region. The percentage of small Cod in the south-eastern region of the North Sea was 

 especially large in 1909 (fig. 42). 



