o30 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [64] 



relative size of the different pouds, as this will to a great extent depend 

 on local circumstances and frequently on the experience of many years, 

 it will be safe to say that in a i^oud farm whose ponds do not differ 

 much from each other as to their supply of food, a total pond area of 

 100 hectares should — at least approximately — be divided among the dif- 

 ferent classes of i)onds as follows : 



Hectares. 



Si)awiiing jjoikIs 4 



Raising ponds of the first class 12 



Raising ponds of the second class 18 



Stock ponds (of which in a two years' course 30 hectares should be stocked per 



annum) GO 



Winter ponds 6 



Total 100 



The above figures not only gi\e valuable hints, but they will serve 

 as a safe guide in organizing a pond farm, where a two years' course in 

 the stock ponds is contemi)lated. Later we shall, on the same principle, 

 give the relative size of the ponds for a one year's course. In organizing 

 a new ])ond farm it will, therefore, be well, in the beginning at least, to 

 follow these tiguies, and only to deviate from them gradually as the cir- 

 cumstances recjuire. Pond culturists will find no dillicully in following 

 these figures by varying the number of fish in the diiiereut raising 

 ponds according to their charac^ter, i)rovided, of course, that the aver- 

 age number i)er pond is not placed too high. If, as is frequently the 

 case in large pond farms, the character of the ponds varies considera- 

 bly, the above figures may in course of time be somewhat different. 

 Thus in the pond farm of Peitz, near Kottbus (Prussia), the total pond 

 area of 4,000 acres is divided as follows:* 



250 acres spawning ponds = 5. 42, in round figures 5 per cent. 



500 acres raising ponds of the first class =10. 84, in round figures 11 i)er cent. 



860 acres raising ponds of the second class.. =18. 65, in round figures 19 per cent. 

 3,000 acres stock ponds (one year's course) :=65. OK, in round figures 65 per eent. 



Total 100 100 



This, however, does not include the winter ponds. According to 

 the above ])roportion, and assuming the spawning jwnd to be equal 

 to 1, the raising ponds of the first class are equal to 2, of the second 

 class to 3.4, the stock ]>onds to 12, while on the basis of the figures 

 given above the spawning ponds of the first class would be equal to 3, 

 of the second class to 4.5, and the stock ponds (one year's course) to 7.5. 

 In finding the most suitable system for a newly organized pond farm, 

 or in correcting mistakes in the management of an old pond farm with 

 a view to reorganizing it, it will under all circumstances be advisable 

 to make the beginning on the basis of the figures first given above. I 



* Delias, Teichuirthschaft, p. 62. \ 



