America)) FisliPj-ics Socicf)/ 125 



(}. Has there been any experiment tried in the line of tak- 

 ing the eggs from them? 



A. 80 far as 1 know there has not. This was a matter dis- 

 covered only last snmmer and there has been no opportnnity for 

 ns to do anything. Bnt it seemed worth while to make the sug- 

 gestion so that if there was opportnnity something might he 

 done. 



Q. Then it is not known in just what form the e^^g may l)e. 

 but probaldy sonu'thiug like the herring vgg. 



Dr. Birge: We shall try if ])ossil)lc to haAe our fish eom- 

 mission get some eggs lU'xt fall. Our s])eeies in the inland lakes 

 spawn in the late fall and 1 would expect the tullibee would 

 s])awn much about the same time. 



Mr. S. ({. Worth, Beaufort, N. (A: 1 would like to ask in 

 what numner the quantity of oxygen in the water at those differ- 

 ent depths was determined. 



Dr. Birge: I gave an accmint of that at the last meeting. 

 The Wisconsin Geological and Natural History Survey has been 

 making an extensve study of the distribution of oxygen in the 

 Wisconsin lakes, and we have been aided by the Ignited States 

 Bureau of Fisheries in that work. We shall nudvc some re])ort 

 on it at the later meetings. Perhaps it would be as well not to 

 go into that at this hour, but the oxygen, temperature and other 

 physical conditions in these lakes were examiiu'd carefully from 

 the surface to the bottom, at fre(iuent intervals, as close as one 

 meter apart, wherever there was any essential change. Mi-. Wag- 

 ner was working with us, catching fish in the same lakes as those 

 in which we were determining physical characteristics; and there 

 is no question about the correlation, the work l)eing done within 

 the space of a few days. 



