American Fisheries Socicly. ii:; 



DISCUSSION oi" Tiii: (;R.\^■|.l^"(; papkus. 



The President: (ieiulenien, ha\e you any remarks to make 

 al)out these ])ai)ers on the s^rayhnL;' .^ 1 am sorry the i^entlemen are 

 not here to answer questions. I want to inquire if any _<;entleman 

 here has had experience with them, so that they can say what is the 

 most natural temperature for them? I infer that the fry thrive 

 best in a hii;"h temperature, and my ex])erienee is tliat the fry do 

 best at about 70 degrees. 



Mr. Ravenel : That is sustained by most of those who have 

 received shipments of eggs from us, and I think most of the ship- 

 ments were received in good condition. At the Duhith station ATr. 

 Wires hatched them in jars ; after the fry were all hatched they 

 were poured out on trays. He suffered a heavy loss on 

 account of a sudden rise of temperature, that would have had no 

 effect eight or ten days later. He held them in the Duluth hatch- 

 ery until the water attained 70 this spring. The change of temper- 

 ature came just as they were commencing to take food. 



The President : May I inquire what you know about the 

 normal temperature of the water where the grayling are indigen- 

 ous? 



Mr. Ravenel : I think the average temperature at Red Rock 

 Lake was 52. 



Mr. Bryant : Is there any difference between the Montana 

 grayling and the Michigan grayling? 



Mr. Ravenel : I think so. I think Dr. Henshall states the 

 difference, and there seems to be a difference in their spawning' 

 habits. The Montana grayling is as easily spawned as a trout. 



Mr. Bryant : Which of them is dift'erent from the European 

 grayling? 



Dr. Smith : Both of c^ur grayling resemble the European 

 grayling very closely ; but whether the Montana or Michigan 

 species is more closely related to the European, I can't say. 



Mr. Clark: Mr. Chairman, just a word. The Michigan 

 grayling, if caught wild during their spawning season, spawns as 

 readily as trout or any other kind of fish, and gives good hatching 

 results ; this was demonstrated on the .A.u Sable and Manistee 



