[91] 



POND CULTURE. 



557 



are all of the best kind. Managed witliout any system, tlicy yiold an- 

 nually 300 pounds of carp, each fish weighing 1.4 and at most J.(i pounds. 

 By systematizing the management of this (arni according to the prin- 

 ciples laid down in previous chapters, the result will be about as Ibl- 

 lows : One-seventh part of the 700 ares, therefore 100 ares, are allowed 

 to lie dry for sowing. The other COO aies are to be utilized in the fol- 

 lowing manner : 



Pouds. 



10 per cent spawning ponds. 

 :w jier ci^nt raising ponds . .. 



4.') iKtT cent stock ponds 



15 per cent winter pouds 



No. of 

 ares. 



Number of fisb. 



Minimum 

 pfer are. 



00 

 180 

 270 



1.8 

 1.2 



^"^''Mt^^'h"*^^- 



.•(24 

 324 



2.7 

 1.8 



480 

 480 



*0f the area of winter ponds giveu liere, a i)art may be used for raising jiurposes, but in the pres- 

 ent schemo this need not be taken into cousiderati(m. 



On the above basis of stocking, the yield in tlu^ Ihiid year will be: 

 In poor ponds, 324 fish at 1.5 pounds=480 i)ouuds; in good i)onds, 480 

 lish at 1.5 pounds=721) i)ounds. 



In managing and stocking the i)onds on the basis that the tish are 

 not to be sold till the fourth year, when they have reached a minimum 

 weight of 2 pounds apiece, the scheme would be as follows : 



Ponds. 



Number 

 of ares. 



6 per cent spawning pond 



15 ])or ceut raising pouds of the first class . . . 

 25. 5 per cent raising ponds of tile second class. 



42. 5 per cent stock ponds 



!) per cent winter jjonds 



36 



102 



153 



255 



54 



Nniuber of lisli. 



Minimum,,,, ., ! Average 

 per are. ' per are. 



3.0 ; 300 

 2.0 ! 306 

 1.2 j 306 



4.5 

 3.0 

 1.8 



Total. 



460 

 460 

 460 



On this basis the yield in the fourth year will be: In poor ponds, 300 

 fish at 2 i)Ounds=:612 pounds; in good ponds, 400 fish at 2 ])ouuds=OL'0 

 pounds. But in the fourth year we may count on some pike, ecjual 

 to at least 5 per cent of the stock of carp, in round figures 30 to 45 pike 

 at 2 pounds; therefore, a total quantity of pike of GO to 1)0 pounds. 

 The grand total of the yield will therefore be: 012 pounds carp + 30 

 pouuds pike=042 pounds, and 020 pounds carp + 45 jmunds pike=0(;5 

 l)ounds; consequently an excess over the sale offish weighing 1 .5 jiountls 

 ajfiece of 15G and 230 pounds, respectively; which excess, owing to llic 

 fact that in all probability the cari> in the fourth year will have reaclied 

 an average weight of 2.37 pouuds apiece, will be increased to from ;;0() 

 to 400 pounds. 



It should of course be taken into consideration that this favorable re- 

 sult in the fourth year is attained one year later than the suudler yield 



