ALLEN and DeMARTINI: NEARSHORE DISTRIBUTION AND ABUNDANCE OF PELAGIC FISHES 



can be characterized as an opportunistic feeder that 

 forages both day and night (M. J. Allen 8 ). Nighttime 

 dispersal in this species as in Seriphus politus could 

 be related to feeding activity. 



Results of day-night comparisons of foregut full- 

 ness in Peprilus simillimus were inconclusive due to 

 the limited time period over which samples were 

 available (June and July 1980 only). Our data none- 

 theless indicate that, at least during this time period, 

 P. simillimus fed both day and night. 



Atherinopsis californiensis appears to be strictly 

 diurnal in its feeding activities. The observed disper- 

 sal within the inshore section of the study area prob- 

 ably has some other cause(s) than feeding be- 

 havior. 



In summary, feeding behavior is probably an impor- 

 tant factor related to nocturnal dispersal in Seriphus 

 politus, Engraulis mordax, and Genyonemus lineatus 

 but not in Atherinopsis californiensis. Crepuscular 

 spawning may also be important in determining diel 

 movements in S. politus during March through 

 August. The cause of school dispersal in atherinids 

 (represented by A. californiensis) is unknown, but 

 deprivation of visual schooling cues and relaxed pre- 

 dation pressures remain as two possibilities. 



ACKNOWLEDGMENTS 



We thank all persons who assisted in the field 

 collections, especially C. Engel, R. Fountain, F. 

 Koehrn, K. Plummer, and D. Roberts. Special thanks 

 go to J. Fox for typing drafts of the manuscript. 



This report is a result of research funded by the 

 Marine Review Committee, Solana Beach, Calif. The 

 Marine Review Committee does not necessarily ac- 

 cept the results, findings, or conclusions stated 

 herein. 



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585 



