Talked with Jay Burnett at 7PM about cod.  I wondered if the 
variation of Vg titer as measured by my antiserum could be a 
useful approach to studying food habits.  If cod did not feed 
for periods during the day, perhaps Vg titer dipped to 
undetectable levels despite the fact that they were actively 
vitellogenic.  Jay reminded me that Ed Tripple studied sperm 
production in cod using the St Andrews cod rearing facility. 
Such a facility might allow me to do the experiments 
necessary to establish the relation of Vg titer to daily 
feeding patterns.

Baltic cod population.  It is the most studied and published 
population of cod.  Ed Tripple is now on sabbatical in 
Germany at U. Kiel with Jonna Tomkiewicz 
(jtomkiewicz@ifm.uni-kiel.de)who studies cod in the Baltic.  
There is a cooperative study of the cod among Germany, 
Denmark, Sweden, Finland, Latvia, Lithuania, and Estonia.
Jay could put me in touch with the people there and get me 
onto a survey ship that did the Baltic.