15 



are attached to the bottom. After 12-18 days pelagic larvae 

 emerge . 



The control of catch levels is the primary stock enhancement procedure 

 for this species. Habitat management is important to insure a high water 

 quality, especially in estuaries and coastal waters. A hatchery program 

 would have to be approached on a limited pilot basis coupled with economic 

 studies. An analysis of the different existing stocks is needed to under- 

 stand the basic biology of this wideranging important species. 



Pacific Pollock 



Theragra chalcogramma , the Pacific (walleye) Pollock, is one of the most 

 heavily fished species in the world, chiefly by the Japanese and Russians. 

 Relatively little is known of the stocks of this species. Japanese investigators 

 predict that the size of the catches will be sharply reduced shortly as the 

 three exceptionally large size classes are finished (1) . 



Without a basic understanding of the ecology and population dynamics of 

 this species, recommendations on possible stock enhancement procedures would 

 have to be very general. As is the case with many of the offshore fisheries, 

 basic information is lacking which is needed to develop meaningful management 

 and stock enhancement programs. 



