SEA-FISHERIES LABORATORY. B07 
wide-meshed net, such as the Yngel-trawl, catches far 
larger quantities of the larger organisms, and fewer of the 
smaller forms such as Viatoms and Dinoflagellates and the 
more minute Larvae. After the evidence that we quoted 
last year from the Forms, it is unnecessary to say more 
than that that result has been corroborated again by this 
year's work. | 
(0) We find again that, except on a few occasions, 
the weighted net working in a deeper zone obtains a larger 
catch than the surface nets, and that, on the whole, the 
most populous layer in the water is a few fathoms below 
the surface. 
(6) Again the Nansen net, worked vertically through 
the zone from 20 up to 10 fathoms, invariably catches 
more than the Hensen net under the same circumstances. 
and in the April hauls, at Station I, may have as much as 
ten times the quantity of Diatoms. In some cases the 
Hensen net shows clearly an increase of catch on being 
hauled up through a more superficial zone than the usual 
20-10 fathoms; but in other cases it does not. For 
examples of the former, which we regard as the normal 
state of affairs, take : — 
April 24. Station J—20-10 faths. = 9,175; 20-0 faths. = 18,050 
Peer i OLNOS Fons Nes aD (Gas MO) a SR ine) 
August 20. sh I—20-10 ,, = SOOO: Owe — 800 
September 15. ae je 0>10nuer = IOOO S WOR. 5 SONG) 
The increased catch seems due not merely to the increase 
of distance, but to the fact that above 10 fathoms the net 
enters a more populous zone (see August 20th, above) ; 
while April 29th supports the view that 10-5 fathoms has 
a richer fauna than the water above. 
(7) The general result this year is that the spring 
and autumn maxima of Diatoms are distinctly later, and 
are also less marked than in 1907. The maxima of the 
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