RECORD OF THE LARVAE OF THE JACK MACKEREL 

 (TRACHURUS SY M METRIC US ) , 1957 



Jack mackerel larvae are recorded by size In table V. The data are sum- 

 marized in text table 9, by month and area. The distribution and relative abun- 

 dance of jack mackerel larvae in 1957 are Ulustrated In figure 5. Four categories 

 of abundance are used In the chart. The value shown for a station is the cumu- 

 lative standard haul total of jack mackerel larvae taken in all occupancies during 

 the year. 



The size groupings of larvae in table V have the following midpoints and 

 raises: 



The relative abundance of jack mackerel larvae in different parts of the 

 CCOFI survey area in 1957 is compared with their areal abundance during the 

 preceding two years in the following summary: 



1955 1956 1957 



59 



