26 American Fisheries Society 



result seemed amazing, as though there was twice as much natural 

 food in the ponds treated as in those not treated. Whether this 

 natural food supply is increased, or simply fed by this meal, is a 

 matter, I think, for science to decide. 



These are only some facts that have been discovered and jotted 

 down to get information and provoke a discussion. Several tons 

 of this food has been sold by Comstock Park Fish Food Company, 

 and possibly some of the men that have been using it are present 

 at this meeting. If so, I would appreciate hearing what success 

 they have had, how the meal has been prepared for use, etc. 



The Wistar Institute of Anatomy and Biology, of Philadelphia, 

 Pa., seems to be having great success in feeding it to their colony 

 of white rats. They claim that their death rate has not only been 

 reduced, but that their litters have been increased. 



Discussion. 



Mr. Geo. H. Graham, of Massachusetts: I would like to ask Mr. Lydell 

 if he ever fed this meal to trout or salmon. 



Mr. Lydell: I have not had occasion to feed it to brook trout. We fed 

 it exclusively to chinook salmon one season until they were about six inches 

 in length. They did better than on liver and there were only thirteen 

 deaths among 600 fish in one small pond. 



A Member: What is the difference between the cost of liver and this 

 preparation? 



Mr. Lydell: I cannot say exactly, but this meal costs about ten cents 

 a pound and we feed less than one-third as much of it as we would of the 

 liver. Besides we can rear the fish better on it. 



Mr. Graham: To what other fish can it be fed? 



Mr. Lydell: We have fed this food exclusively for two years to yellow 

 perch and large- and small-mouth black bass. 



The mussels are shipped to us from the button factories. After they are 

 dried they are stored in that condition. When we want them for food we 

 put them in the dryer and then run them through the grinder, which is 

 connected with a gasoline engine. 



Mr. Graham: Is there any limit to the amount we can get? 



Mr. Lydell: I should judge that we could have secured forty or fifty 

 tons within thirty miles of Grand Rapids. 



Mr. Graham: What is the name of the company and are they now 

 selling the meal? 



Mr. Lydell: The Comstock Park Fish Food Company is preparing 

 now to handle the meal in a commercial way. (Mr. Lydell then exhibited 

 samples of the dried mussels and various grades of the meal intended for use 

 with fish of different sizes.) 



