Bower Paralarval drift of and inferred hatching sites for Ommastrephes bartramu 



405 



length at each station, suggesting several possible 

 spawning scenarios. If spawning were isolated to 

 specific geographical areas, synoptic sampling would 

 pick up different size ranges of paralarvae, depend- 

 ing on the proximity of the sampling site to the 

 spawning site. Consistently large size ranges sug- 

 gest that spawning is not spatially isolated. Further- 



more, they suggest that spawning by the local popu- 

 lation does not occur in intermittent bursts but is 

 occurring over an extended period. Estimated hatch 

 dates confirm this. The largest squid caught was 8.3 

 mm, suggesting that this is approximately the size 

 at which paralarvae are fully capable of avoiding the 

 4-m 2 plankton trawl or that they leave the upper 100 



1 1 II I 200 300 400 500 MX I 



Distance offshore (km) 



Figure 5 



Relationship between mean mantle length of Omma- 

 strephes bartramii paralarvae collected from each station 

 and distance of station from land. Data from all five cruises 

 are combined. Correlation is not significant (P>0.05; 

 Student's r-testl. 



