DISTRIBUTION OF EGGS AND LARVAE OF JACK MACKEREL 



267 



The slope of the abundance curve is not con- 

 stant. Survival during the first 9 days is verj' low 

 but after this initial period, it is better. The 

 inconsistency in the estimates of larvae older than 

 40 days is most likely due to sample variation. 

 These estimates are made from small numbers of 



observations and have therefore a large error 

 associated with them. 



Although these data are in some respects quite 

 limited, they are comparable with the survival 

 data collected by Sette (1943) for Atlantic mack- 

 erel and Ahlstrom (1954b) for Pacific sardine. 



Table 21. — Regional distribution of jack mackerel larvae, by month and size class, 1963 



[In bUUoDS] 



