190 Modern Fishculture in Fresh and Salt Water. 



veyed to the natural spawning beds, and there care- 

 fully liberated, where natural food is abundant. 



The method of impounding whitefish above referred 

 to possesses marked advantages over the other method, 

 because the fish can thus be held alive and in good con- 

 dition until their eggs have all been taken. They are 

 continuously held under observation, and when fully 

 ripened can be handled with the best results. There 

 have been seasons when the taking of eggs of whitefish 

 directly from the nets on the open lakes has yielded 

 very unsatisfactory results, while for the same reason 

 the impounding method has given most satisfactory 

 results. It has been pursued continuously for years by 

 the Michigan and Canadian Fish Commissions, with 

 such excellent results that it may be said that it is sure 

 to yield uniformly a large quantity of eggs, sometimes 

 more than the capacity of the hatcheries will accom- 

 modate. 



In distributing the young fish it has been found best 

 to establish at convenient places on the lakes what are 

 called "Relief Stations." These stations are operated 

 for only about two months in the last part of the hatch- 

 ing season, the eggs being removed to these stations at 

 as late a date as possible consistent with safety. For 

 the first part of the season the eggs are all carried at 

 the home station, this method resulting in economy, and 

 the subsequent removal to the relief stations makes the 

 distribution easier, and avoids the overcrowding of 

 young fish at the hatching time, and consequent loss. 



As one of this family, the Adirondack frost fish, has 

 adhesive eggs, its treatment will be found in Section V. 



