FIGURE 4. --CAMERA UNIT MOUNTED IN SUPPORTING FRAME USED IN COD END OBSERVATION 

 WORK. (camera lens IS COVERED TO PROTECT THE PICKUP TUBE FROM EX- 

 POSURE TO DIRECT sunlight). 



water depth is payed out. An additional 

 anrnunt of slack in the camera cable (about 

 10 percent of its length) is allowed once 

 the net is under tow to provide for wave 

 action, slippage of the trawl winch brake 

 (as in hang-ups), or any unexpected strain. 



An electronics expert attends the 

 equipment continuously during the tow to 

 effect whatever adjustments are required. 

 Improper action of the net may be detected 

 from the television imctge and remedial 

 measures quickly taken. Observations of 

 the gear and activities of the fish are re- 

 corded as written notes, audio tape record- 

 ings, and still or motion pictures. 



Hauling back 



The trawl is hauled back with parti- 

 cular attention paid to hauling the camera 

 cable at the same rate as the trawl cable. 

 As the trawl comes alongside, great care 

 must be exercised in handling the cable. 

 A slack cable at this point may be cut by 

 the propeller or become snarled with the 

 net. 



The cable is detached from the head 

 line, and the net is rapidly hauled aboard. 

 The cod end with the camera unit is brought 

 alongside, hoisted over the rail, lowered 

 to the deck, and the cod end emptied of 



