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FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



(instead of estimates of abundance) for these 

 selected lines and stations were summed by 2- 

 month intervals from February to July. The 

 bimonthly totals for the lines were divided by 

 the bimonthly totals for the entire area to give 

 the bimonthly percentage of eggs found on the 

 line. To estimate the offshore-inshore move- 

 ments, stations 100 and seaward (offshore) were 

 grouped together, stations 70-90 (intermediate) 

 were grouped together, and stations 60-shore 

 (inshore) were grouped together for each line. 

 The station groups were summed bimonthly and 

 the percentage of the bimonthly total for each 



of the three station groups was computed (tables 

 6, 7, 8, and 9). Table 10 presents a comparison 

 of the estimates of relative regional abundance 

 obtained from the standardized numbers of eggs 

 at selected stations on selected lines and the 

 regional distribution based on estimates of abun- 

 dance using all data. Since the north-south 

 regional distribution indicated by the selected 

 data agreed with the north-south distribution 

 indicated by all the data, no distortion was 

 anticipated in using the selected data to reveal 

 the offshore-inshore distribution. 



Table 4. — Estimated number {in billions) of jack mackerel eggs in survey area, 19BS 

 (Cruise numbers in parentheses. No eggs taten during cruises 6301, 6309, 6311, and 5312) 



' Hundredths of a percent are used so that trace amounts of spawning may be indicated (see p. 262). 



