240 SALMON-FRY OF PONDS. 



weather and low water in tlie river, nor influenced 

 in any way by floods. If every thing is done as 

 recommended, the ova will be hatched in seasons 

 of high temperature in a period of about 100 days. 

 Ova deposited in the early part of September, 

 taking the average temperature of late seasons, 

 will be hatched in 90 days, or thereabouts ; but 

 ova deposited in November, subjected as they 

 must be to the low temperature of the winter 

 months, will not be incubated or hatched in less 

 than from one hundred to one hundred and forty 

 days. The variation will depend on the mildness 

 or severity of the winter. 



Salmon-fry bred in artificial ponds may be 

 allowed to remain in them one whole year, that 

 is, until they have assumed their silver-hued, 

 migratory dress. They are then to be turned 

 free into the river, when they will go to sea and 

 return from it as regularly as those fish which 

 have been produced by the natural process. There 

 are two ways for stocking rivers with salmon, 

 whether they be rivers in which salmon have 

 never bred, or rivers in which they formerly bred, 

 but in which the race is partly or totally extinct 

 by the carelessness or mismanagement of man. 

 The first is by conveying to them impregnated 



