80 



to keep tliem long enough in a pond to attain this 

 weight and the best perfection possible, we must 

 arrange the ponds in such a way as to secure this as 

 rapidly as possible. 



The case is by no means the same either with trout 

 or California salmon. These fish are marketable when 

 they have attained the weight of two hundred grams, 

 and it is to be observed that they bring a better return 

 at this weight than those weighing two, three, four, or 

 more kilograms. As a matter of fact in the Paris 

 market the large trout bring eight francs, while the 

 small ones of two hundred grams are sold at ten francs. 



But a carp weighing two hundred grams is not edi- 

 ble. It is precisely this difference between the Cali- 

 fornia salmon and the carp which serves as a basis for 

 organizing the new method of culture, which I have 

 the honor to explain. We seek merel}'' to obtain small 

 Salmonidse, and this permits us to secure an annual 

 return, a thing which the carp rarely furnishes. 



Doubtless this difference in the method of culture 

 w^ill incommode not a little the fish culturist who is in 

 the habit of raising carp. But pond culture of the 

 California salmon as I shall explain it is very simple. 



As in all intensive culture this requires care, fre- 

 quently greater care than with the carp ; but we shall 

 see that it 3delds nearly ten times as much as carp 

 culture. 



We will now for greater clearness inquire succes- 

 sively into the different conditions which may present 

 themselves in pond culture. 



Suppose, in the first place, a property contains 

 many ponds, some with warm water, others with cold 

 water, a condition of frequent occurre>ice, how shall 

 these ponds be arranged for use in the culture of the 

 Salmonidae ? 



The principal prerequisite for a pond culturist 



