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In a message dated 11/22/2011 4:18:50 A.M. Mountain Standard Time,  
[log in to unmask] writes:

It was  only a big, brownish, digested mix of something...

For want of a better term we used to call it Gurry.  
 
Anyway, stomach content analyses were a popular endeavor a few  decades 
back when life history studies were in vogue. Some  of  these papers will be 
hard to find except in good libraries..  Some  may have been digitized and be 
available on line.  You might see if you can  find Hyslop, E.J 1980. Stomach 
contents analysis - a review of methods and their  applications. J. Fish. 
Biol. 17:411-429.  I imagine that the European  literature will be a better 
area for your search since herring have been a very  important fish for a 
long time and presumably well studied?
 
Frank

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