408 



Inland Water Culture 



FIG. 242. Diagram illustrating the conditions for fish production on an 80 



acre tract of wet upland, traversed by a trout stream. A, in a wild state. 



B, equipped for intensive fish raising. 



Area devoted to fish, in A, one acre more or less; in B, one acre of enclosed ponds. 

 Devoted to fish forage, in A the same acre of open stream, in B, forty acres of ponds, 



planted and under control. 

 Devoted to land crops, in A none, it is all too wet and sour; in B, all the made land 



between the ponds. 



that are to eat it. This is a suggestion for the application 

 of the principles discussed in the earlier pages of 

 this chapter. There is, of course, nothing original 

 about it: it is what has made modern animal hus- 

 bandry possible. It has not been applied to fish cul- 

 ture, however, and we are not able to give any figures of 

 production because it has not been tried out in a practi- 

 cal way even on such a scale as is here shown. 



Swamp Reservations Now, having presented apian 

 for complete utilization of the marshes, we hasten to 

 add that we believe it would be a great misfortune if 



