114 Tzventy-ninth Annual Meeting 



rivers a number of years ago, when something like 50,000 eggs 

 were taken and hatched. But these grayhng will not domesticate 

 and mature their spawn when held in ponds. 



We have at North ville at present some grayling that are 

 between seven and eight inches long, raised from eggs from Mon- 

 tana. We do not introduce warmer water because they seem to 

 require it, but for the food. These fish were held in troughs until 

 September, supplied with a mixture of spring water at 53 and 

 creek water at yi or 73, but the creek water was used only for 

 the purpose of adding to the supply of food. Since then they 

 hav'C been in a pond fed with spring water at 53, going down 

 perhaps to 48 in the winter. 



The Secretary: I do not think the water should necessarily 

 "be as high as 70 to get the best results. Take the Au Sable, once 

 a famous grayling stream, as an example. I have taken the tem- 

 perature of that stream in the month of August, when the water 

 is about as warm as it ever gets, and it ran from 55 to 60. I did 

 not find it above 60 at the hottest time in August, though it was 

 probably wanner farther down stream. I can't say what the tem- 

 perature is in April and May, when the fish are spawning and 

 hatching, but it must be a good deal lower. 



Mr. Ravenel : I think 60 is a very high temperature in the 

 Au Sable, but Dr. Henshall's whole claim is that they should be 

 transferred to a warmer water just before they commence to feed. 

 It wasn't because he wanted warm water, but because of the con- 

 ditions that the warm water produced. 



Mr. Nevin: I would say that I saw those grayling at Du- 

 luth, and I never saw trout eat more ravenously than they did. 



Mr. Thompson : We have some grayling at the Nashua 

 station that have been fed nothing but liver. We took some of 

 them out doors and some were left inside in water of 48 tempera- 

 ture — the water outside was 60. Those inside did not seem to 

 have much desire to eat, while those outside ate very readily. 

 We prepared the food, of course, with very great care and also 

 placed them just below some troughs of brook trout we were 

 feeding. The water from the brook trout passed right through 



