868 



Fishery Bulletin 98(4) 



Figure 3 



Typical association behavior of striped jack at night obsei-ved in 20-mm-TL juveniles: 

 (Al transparent flotsam. (Bl p"ay flotsam. 



5 1 



10 



15 



20 



25 



30 



Total length (mm) 



Figure 4 



Onset nf association behavior in the striped jack. Associ- 

 ation ratio-s at 16 h lA) and 24 h iB) after starting experi- 

 ments (12:00 and 20:00) were plotted against total length 

 at each stage. * shows significant difference between 

 tests and controls (P<0.05; Scheffe's test). 



algae, may influence the recruitment of flotsam-associat- 

 ing species. 



Acknowledgments 



We would like to thank K. Imaizumi, H. Kuwada, and M. 

 Kanematsu in the Japan Sea-Farming Association for gen- 

 erously providing fish and facilities. We also thank Martin 

 D. J. Saver of the Dunstaffnage Marine Laboratory and 

 Matthew J. Dunlap of the Oceanic Institute for improving 

 the English text, and three anonymous reviews for con- 

 structive comments. This work was partly supported by a 

 grant from Japan Society for the Promotion of Science. 



Literature cited 



Abacus Concepts, hic. 



1992. Stat View, version 4.51.1. Abacus Concepts. Inc., 

 Berkeley. CA, 464 p. 

 Clarke, T. A., and G. S. Aeby 



1998. The use of small mid-water attraction devices for 

 investigation of the pelagic juveniles of carangid fishes in 

 Kaneohe Bay, Hawaii. Bull. Mar Sci. 62:947-955. 

 Gooding, R. M., and J. J. Magnuson. 



1967. Ecological significance of a drifting object to pelagic 

 fishes. Pacific Sci. 21:486-497. 

 Grecnblatt, P R. 



1979. Associations ol'tuna with flotsam in the eastern tropi- 

 cal pacific. Fish. Bull. 77:147-155. 



