I July, 1995 we were surveying a reef on the Northern end of San Salvador  
Island in the Bahamas when we encountered a close swimming school of about 
30 bue tang surrounding a 1.5 meter reef shark. This assemblage processed 
along the reef for several hundred meters and was seen 10-15 minutes later  
by another team on another part of the reef. We have never seen this  
behavior before or since and are curious about it. One suggestion in 
discussions has been that it may be similar to the mobbing behavior of  
birds in the presence of a predator.  

We would really appreciate any insights that you can provide about this. 

Tom McGrath 
Bahamian Reef Survey P.I. 
mcgratta@scccvc.corning-cc.edu