netic properties. However, because detection 

 is possible only at a much shorter range than 

 with radar or visual systems and because no 

 classification of vessels is possible, magnetic 

 techniques presently have little potential for 

 use in fisheries enforcement. 



Acoustic Techniquessi 



Detection and classification of fishing 

 vessels by use of acoustic techniques is possi- 

 ble because the technology for the generation, 

 transmission, and reception of acoustic energy 

 is well established and the factors that in- 



fluence acoustics in the ocean and atmosphere 

 are well known. 



The use of acoustic techniques for the detec- 

 tion of fishing vessels can be extrapolated 

 from the Navy's experience in submarine 

 detection. However, new equipment and new 

 methods of use would have to be developed. 

 Since most of the existing acoustic systems are 

 highly classified it is not possible to describe 

 them, except to say the equipment is very 

 complex and costly to operate. Much develop- 

 ment would be needed to determine the 

 usefulness of these systems for fisheries law 

 enforcement. 



VIA Photo 



Oceanographic vessels, such as the Albatross II of Woods Hole, will be used in some fisheries research 



58 



