RAPPORTS. XIV : THOMPSON 



H 



..--• s 



\~ L 



Fig. 20. Percentage of Large and Small Haddock in the Total Catch of that 



Fish; 1906 — 10. 



process of summation and interpolation we can, for instance, learn, that (roughly speaking) 



one half of the fishing is done below and one half above the approximate depth of 35 m. 



(19 fathoms) in the case of sailing trawlers; 38 m. (21 fathoms) in the case of the sailing 



liners; 52m. (29 fathoms) in the case of steam trawlers; and 79m. (43 fathoms) in the 

 ' c r case of the steam liners. 



Again, roughly speaking, 

 I estimate that one-half of 

 the work of the English 

 (East-coast) Sailing Traw- 

 lers is done between 28 

 and 44 metres (15—24 

 fathoms); of the Sailing 

 Liners between 31 and 52 

 metres (17 — 29 f.); of the 

 steam trawlers between 36 

 and 67 metres (20—37 f-) ; 

 and of the steam Liners 

 between 71 and 88 metres 

 (39-48 f.). 

 In like manner, I estimate (from the figures given in Table IV a), that half the total 



catch of demersal fish landed (by first-class vessels) on the East Coast of England is 



caught between 34 and 66 metres (19—35 f); half the Cod, between 33 and 62 metres 



(18— 34 f.); Haddock, between 40 and 70 metres (22—38 f.); whiting, between 37 and 64 



metres (20—35 f.); Ling, 



between 54 and 96 metres - ' 



(30— 53 f.); Saithe between 



60 and 1 10 metres (33—61 



f.), and Catfish, between 45 



and 75 metres (25—41 f.). 



e. The relative Abund- 

 ance of different Sizes, 

 or commercial Catego- 

 ries, of Haddock and 



Cod (Table V, IX, X). 



With regard to the 

 distribution of the different 

 sized groups of Haddock 



(Large, Medium and Small) the English statistics of the last five years bring into striking relief 

 certain important facts already in part recognised. I shall deal with these only briefly, for 

 they are under further detailed consideration by the Department of Agriculture and Fishe- 

 ries. I showed in my former report how the percentage proportion of small Haddock 

 showed a tendency to increase on the whole steadily from the shallower to the deeper 

 waters, while the proportion of large Haddock decreases with equal steadiness. These 



Fig. 21. 



Percentage of Large Haddock in the Total Catch of that Fish ; 

 1906 — 10. 



