The Grayling Family 195 



of these plants will result in the permanent 

 establishment of this beautiful and desirable fish 

 in eastern waters. 



The eggs of the grayling are smaller than those 

 of the trout, being but one-seventh of an inch in 

 diameter. When first extruded they are amber- 

 colored, owing to a large oil-drop, which renders 

 them lighter than trout eggs, almost semi-buoyant, 

 and for this reason are best hatched, or at least 

 "eyed," in hatching jars. My plan is to keep 

 them in the hatching jars until the eye-spots show, 

 when they are removed to hatching-trays until 

 incubation is complete. 



In a few days after extrusion the eggs become 

 crystal-like or hyaline in color, when the embryo 

 can be seen in motion. The period of incubation 

 is from ten days to two weeks. The fry when 

 hatched are very small, about the size of mosquito 

 "wigglers" (larvae). Their umbilical yolk-sac is 

 absorbed in a few days, when it becomes impera* 

 tive to supply them with stream water, which 

 contains the small organisms (Entomostraca) on 

 which they feed at first. Afterward they can be 

 fed artificially the same as trout fry, which they 

 soon outgrow. 



There is an erroneous opinion that has gained 



