42 



small ones. Eggs both fresh and eyed are so easily and 

 safely transported that distance from the spawning streams 

 is of far less consequence than proximity to a first-class 

 railway station, from which the distribution of the fry can 

 be readily effected. 



The extreme importance of properly constructed and 

 efficiently controlled Hatcheries must be my excuse for 

 having dwelt so long on this portion in the paper, especially 

 as a very prevalent and to many a very pleasant idea is that 

 every watershed in the country should teem with small 

 Hatching-houses, and that the water should be stocked with 

 the improperly developed eccentricities so freely produced 

 by dirt, ignorance, and overcrowding. 



APPARATUS. , 



The apparatus employed in hatching Salmonidae must 

 necessarily vary with the species, temperature of water in 

 hatching, and the character of the waters it is proposed to 

 stock. The principal object is not to incubate the largest 

 number of eggs in a given space, but to so incubate the ova 

 that at some future period for instance, twelve months 

 after laying down the ova the largest number of healthy 

 fish may result ; and I say this advisedly, for it is quite 

 possible to hatch a very large percentage of the ova, and yet 

 a very small percentage of the fry survive the first few weeks 

 after they commence feeding. With a low temperature, 

 and where the ova have to be sent away either as eyed ova, 

 or the fry to be turned out before the conclusion of the yolk 

 sac period, a very much larger number of Salmon and Trout 

 eggs can be incubated per gallon of water per minute with- 

 out any apparent loss than is possible in this country with 

 a high temperature of water and with fry under constant 

 observation for months after they commence feeding. 



