ABOUT DEPRESSION OF STOCK ABUNDANCE IN SOME POPULATIONS OF PACIFIC HERRING CLUPEA PALLASII VAL
The term “stock abundance depression” has been discussed in view of its use for some populations of Pacific herring. All the analyzed populations demonstrated traits, characterizing the state of depression, including misbalance in the age composition of spawning stock, slowing down linear and weight growth, specific for the periods of minimum stock abundance. The threshold level of the stock abundance of mature individuals, estimated for herring of Korfsky and Karaginsky Gulfs to figure out potential risk of depression on exceeding the level, is 127 millions. This amount is 18% from the optimal stock of spawners for given population.