— i8 — 



A deduction of the kind mentioned gives the following results: 



Marketable 



Limits in en. ^^1^^^^ 7o 



Extra Large . . . 50 — 60 0-4 i 



Ivarge il^Uso Z'o 7 



Medium 32V2— 37V2 6-6 15 



Small 27 — 32V2 i3'i 31 



Extra Small . . . 21 — 27 i9"9 46 



Total . . . 43-0 100 



To this we must add unmarketable fish under 21 cm., which may all be 

 reckoned as Extra Small. The average number of individuals belonging to this 

 group will then, including these, be 26-3 haddock per hour. 



We must remember what has previously been said as to the relation between 

 this average catch and the catches of the market-trawlers. Nor must we forget 

 that weights and numbers are two very different things, and that it is only the 

 latter we are at present considering. Finally we must note that sizes over 60 cm. 

 have not been included in these investigations; the number of these large 

 individuals is quite inconsiderable, if we take an average per trawl-hour. 



Bearing all this in mind we can now see from the table that more haddocks are 

 caught below than above 27 cm. Thus in the catches here dealt with the Extra 

 Small group, including unmarketable haddocks, contains a greater 

 number than all the other groups put together. Even if we do not 

 include unmarketable, this group still comprises more individuals than any other; 

 and it all but constitutes the half of the total marketable haddocks. The number 

 of Small (i3'i) is considerably less, though for all that it exceeds the 

 total (lo-o) of all the higher groups combined. There are nearly twice 

 as many Small as there are Medium, and there are more than twice 

 as many Medium as there are Large. The Extra Large form but 

 an inappreciable fraction of the total number, being hardly one per 

 cent of the whole. The two highest groups together only constitute 

 Vio — Vis '-'^ t^^ total haddock caught by trawling. — 



Fulton puts the limit between mature and immature haddocks at 

 II inches or 28 centimeters: that is to say haddocks larger than this will as a 

 rule spawn in March and April while those smaller will not. It will be of interest 

 then to consider the relation between their respective numbers. By planimetry 

 we find from the curve in fig. 4 that there were: — 



Immature haddock under 28 cm. 29*3 fish per trawl-hour 

 Mature haddock over 28 cm. . . . 20'i — — 



Total . . . 49-4 



Thus the trawls have captured considerably more immature than mature 

 haddocks. In the average catches we are discussing here about 60% of the 



