RAPPORTS. XIV: MASTERMAN 



- 8 — 



In A 3 the maxima are about equal at 650 kilos, in the contiguous area (B 4 ) they are 

 not so intense (300 and 400 kilos) and the autumn maximum is much larger than that 

 of spring. 



The secondary mini- 

 mum is, in both areas, 

 in the month of July 

 and is greater in A 3 

 than in B 4 . In other 

 words, the inshore area 

 shows more pronounced 

 variations than its sea- 

 ward neighbour. There 

 can be little doubt that 

 these maxima represent 

 the well known spring 

 and autumn inshore 

 movements of young 

 plaice. In each area they 

 are reflected in lesser 

 degree in the "medium" 

 plaice but the category 

 of "large" plaice show 

 no trace of them. 



Area B 3 (Fig. 3) 

 gives a curve [of some- 

 what the same na- 

 ture, with two maxima, 

 (spring and autum) and 

 a winter minimum. 



The two maxima 

 are in April and Sep- 

 tember for the "small" 

 fish and the autumn 

 maximum is a month 

 earlier for the "medium". 

 Clearly the movements 

 inshore commence slight- 

 ly earlier here than is 

 the case for the more 

 northerly areas, A 3 and 



To some extent, these movements are the inverse of those which appear to occur 

 in the case of the sole, in which species there appears to be a maximum in May or 

 June with two minima in March or April and September. The off-shore areas, Ci Bi D, 

 and D 2 all show the same general character. The small quantities of "small" show little 



LAR&£: . 



. Menu 



S MALL- 



. Total: . 



Figure 3. Average catch of Plaice per day by Steam Trawlers in Areas Bi, B 3 , 



B 5 and C 2 , and by Sailing Trawlers in Area C 3 , of the North Sea. 



(Mean of the 4. years 1906 — 1909). 



