898 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



Fig. 3. — Plan of a natural carp-pond. 



Pond P is a natural body of water. Its extent is about one hundred and fifty to two 

 hundred acres. It is formed by a dam, D, about seven to eight feet high, crossing the 

 Talley and thus collecting the water of a run flowing there. Before D is a deepening, 

 C, the collector. In the dam D there is an outlet leading to another deepening — the 

 so-called outlet collector OC. The purpose of this collector is to keep back fishes that 

 may have passed the outlet when opened. It is provided with a screen or netting. 

 CD, upon the bottom of pond P, is the collector-ditch, which conducts the fishes to C 

 when the water is let out, and thus prevents them being caught in the mud. B is the 

 run of water which, to prevent overflow, has to be conducted around the pond in a 

 separate ditch, leaving an inlet at J, protected by a sluice with screens. 



Fig. 4. — Cross-section of carp-pond, fig. 3. 



W^-frn^ 



F, surface of the pond ; C, collector ; D, dam ; 0, outlet ; OK, outlet collector ; J 

 inlet ; E, stream ; D, the dam ; E, the run or creek. 



