SEA-FISHERIES LABORATORY. 



337 



Fig. 18.— Nansen Net : at left 

 hand when fishing ; at right hand 

 being hauled np, closed. B, brass 

 bucket ; C, canvas front to net ; 

 L, releasing apparatus actuated 

 by M, messenger running on line ; 

 T, throttling noose constricting 

 net ; W, weight. 



still more doubtful whether 

 these vertical hauls can be 

 brought into relation with 

 those of the horizontal surface 

 tow-nets. However, we add here 

 (p. 338) another table of Easter 

 and Summer results at Stat. 

 I, in the three years, taken 

 from the records of the " fine 

 surface " net. This net has 

 nearly the same diameter of 

 opening as the vertical nets, 

 and is made of the same No. 

 20 silk. It is towed for 

 15 minutes while the vessel is 

 going " dead slow," and 

 probably passes through about 

 a quarter of a mile of sea. 

 Whether a column of water a 

 quarter of a mile in length 

 is strained through the net is 

 quite another matter, and 

 it is practically certain to be 

 less, but how much less is very 

 doubtful. 



Looking at these figures 

 along with those of the 

 Nansen net, and omitting 

 Easter, '07, we find that the 

 two series are not very different, 

 and that the surface net, 

 as might be expected, gives, 

 on the whole, larger catches. 

 It certainly strains a larger 

 volume of water, and that it 



