266 



FISHERY BULLETESr OF THE FISH AND WILDLIFE SERVICE 



been relatively constant. In 1952, of the 593 

 trillion eggs estimated to have been spawned, only 

 780 billion larvae are estimated to have sm-vived 

 at the end of 30 days. In 1953, 736 trillion eggs 

 were estimated to have been spawned and 850 

 billion larvae are estimated to have siu-vived, 



while in 1954, 462 trillion eggs were estimated to 

 have been spawned with 830 billion larvae the 

 estimated survivors at the end of the first month 

 of life. This indicates an average survival (for 

 the first month of life) of a little more than 1 larva 

 per 1,000 eggs spawned. 



Table 20. — Regional distribution of jack mackerel larvae, by month and size class, 19S2 



[In billions] 



