264 



MARINE PRODUCTS OF COMMERCE 



small mesh netting supported by firmly attached 65-foot poles. This section has 

 a net bottom secured to the sides. After the bottom has been raised, the fish are 

 brailed directly from the crib into specially designed tenders. 



The heart or crib of this type of pound net, like a weir, has no cover since it is 

 set at depths permitting the top rim to be exposed at high tide. 



Submarine Traps. Deep-water traps are found principally in the Great Lakes. 

 They were designed to fit the particular conditions existing there. Their effective- 



iCourtesy R. J. Ederer Co.) 

 Fig. 13-22. Trap boat raising pot of Great Lake submarine trap to surface. 



ness depends largely upon the several anchor lines that hold them in place since 

 they must be held taut and straight to keep the tunnels open. 



Submarine traps, as they are generally known, have rather short leaders be- 

 cause they are set closely together in long rows. A pair of wings, spread V-shaped 

 and usually hooded, aid in directing the fish into the pot, which has two inside 

 tunnels and is completely enclosed. In removing the fish from the pot the long 

 anchor lines running from the tail end are lifted to the surface by means of a buoy 

 line. The vertical spreader in front is loosened and as the boat works closer the 

 tunnel of the pot is brought aboard. The drawstring is then loosened and the 

 fish removed. 



Floating Traps. The Alaska floating trap, used in the salmon fisheries, is con- 

 structed of logs which are soUdly braced and bolted together. It is anchored oflF- 

 shore and held in place by several large anchors capable of holding under heavy 



