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Alaska Crab 



The king crab Paralithodes camtschatica is an important commercial species 

 in Alaskan waters and is managed by the State of Alaska. Spawning takes place 

 in the spring, and the female carries the eggs through the following winter 

 with the larvae being released in the spring . The larvae are part of the 

 zooplankton for about four months. The juvenile stages settle to the bottom 

 where they spend the majority of their lives. 



Stock enhancement procedures are poorly known for this species. Alaska 

 controls the level of fishing in its waters. However, biologists have had 

 difficulty in applying the usual concepts of maximum sustainable yield to 

 this species (1) . Detailed ecological studies of this crab would provide a 

 broader basis for any proposed enhancement program. 



The tanner crabs (genus Chionoecetes ) have recently become of commercial 

 importance. In general the comments about the king crab are pertinent to these 

 crcibs. 



Atlantic Herring 



The Atlantic Herring Clupea harengus harengus is widespread and in the 

 western Atlantic it is distributed from Canada to Cape Hatteras , North Carolina 

 with different stocks thought to exist. As of August 1975, NMFS listed this 

 fish as a depleted species (4) . 



Although adults may enter estuaries, most of the early stages of the life 

 cycle of this species are completed offshore. Spawning occurs in different 

 seasons depending on the locality. In general spawning is earlier in the year 

 at higher latitudes (5) . Compared to other species, the female produces 

 relatively few eggs which are heavier than sea water. These eggs sink and 



