Mo MAKING A FISHERY. 



Stocking with When attempting to stock with eyed ova, 



eyed ova. * ° J 



'they should be planted on artificial redds made 

 on bright gravel shallows, in such places as 

 those described in a previous paragraph as 

 suitable spawning ground. The conditions 

 under which success may be anticipated are 

 where there are practically no fish of any sort 

 in a stream, but where, nevertheless, the water 

 is unpolluted, or where suitable tributary 

 streams or carriers can be found. Such 

 carriers must have a continuous supply of pure 

 water, and, after being emptied of all fish pre- 

 viously contained therein, be securely fenced 

 off at the upper and lower ends. 



Even under these conditions it is doubtful 

 whether the plan can be recommended as 

 economical. It is true that eyed ova can be 

 purchased at a low price, but the number re- 

 quired for stocking anything like an extensive 

 fishery would be enormous. Besides, the cer- 

 tainty that at best only a small percentage will 

 hatch out, and that the presence of sewage or 

 other contamination, even in small quantities, 

 will be sufficient to prevent their hatching at all, 

 there are many elements of danger. Then the 

 alevins are very helpless, and are devoured by 

 a great variety of predaceous aquatic larvae, as 

 well as all the other numerous enemies of the 

 Salmonidai. The accidental formation of con- 



