A METHOD OF CULTIVATING TROUTS AND SALMONS. 



785 



season the fish were closely observed and it was ascertained that some of the 

 smaller fish, apparently nonspawners, invaded the nests and with their noses 

 dug into the gravel after the eggs. None of the fish was ever seen in the act 

 of devouring fry, but the disappearance of the young could be accounted for 

 in no other way than by the assumption that they were devoured by the 

 adult fish. 



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I'lc. 1 . — Plan of ponds and spawning race. 



In September, 1907, a spawning race was constructed and connected with 

 the ponds, substantially as shown in diagram i , and the inflow water was diverted 

 through the race to the ponds. The race is 2j/^ feet wide, 100 feet in length, and 

 is paved with stones, loosely placed, and then covered partially with coarse sand 

 and gravel. The race has a grade of approximately i in 20, and is made spiral in 

 form, owing to limited ground area. Water afi'ording a depth of 3 to 6 inches 

 passed through it, the gradient giving it a rapid flow. 



