5c American Fisheries Society 



gested to the writer. Accordingly, samples of dried 

 blood, fish meal and various grades of meat scraps were 

 obtained. Up to the present time only the first two have 

 been tried. All attempts to feed young rainbow trout 

 with the blood failed, so this was abandoned after a trial 

 of two weeks. On the other hand, the use of fish meal 

 was so successful that it has been continued for the last 

 two years. 



Fish meal, as nearly as can be learned, is that residue 

 obtained after the extraction of oil from fish carcasses. 

 It varies considerably in texture and purity apparently 

 depending upon the place of manufacture. That which 

 was used by the writer was clean, dry, buff in color 

 and consisted of a mixture of fine meal and coarser 

 material, a few particles of which were as large as 

 small peas. By sifting through a screen thirty meshes 

 to the inch, a fine meal was obtained suitable for ad- 

 vanced fry. Passing the residue through a screen with 

 larger meshes, a coarser material fit for fingerlings was 

 obtained; while the last residue was of good size for 

 yearlings. 



All sizes of this food have been used successfully both 

 in a dry condition and softened in water. For advanced 

 fry and small fingerlings the writer has merely sprinkled 

 the dry meal over the water surface. The young trout 

 rise and clean it up in a surprisingly short time. A very 

 small portion of the food will sink, but this is immedi- 

 ately seized by the less ambitious feeders. For larger 

 trout the food is first softened by placing for a period 

 of ten or fifteen minutes in sufficient water to cover it. 

 The water is completely absorbed, thereby preventing the 

 extraction of nutritive materials. It is then only neces- 

 sary to cast a handful at a time over the pond. 



Rainbow and brown trout of all sizes will take the food 

 greedily. No trial has been made with brook trout or 

 other salmonoids. All minnows worked with, including 

 the horned dace and various shiners, immediately seized 

 the food without any coaxing. Success was attained also 

 in feeding yellow perch and common sunfish, although it 





