1136 REPORT OF COMMISSIONER OF FISH A5^D FISHliRIES. 



[4] ^ 



free from euemies of the fish and contain sufficient food. In about 

 four weeks the young fish have reached the length of several centimeters, 

 and are transplanted once more, because they can no longer find suffi- 

 cient food in a pond having an area of 3 hectares [7^ acres]. So far 

 about 25 per cent have been lost, so that only 75,000 young fish are 

 taken out. 



The raising-pond No. 2 has likewise lain dry as long as possible. It 

 had been sown with grass or clover, which has been harvested. The 

 pond is stocked at the rate of 1,050 fish per hectare [2 J acres], of which 

 number, as a general rule, 1,000 ^re caught again in autumn, when 

 they have reached the weight of one-quarter of a pound and more. If 

 the pond is only stocked at the rate of 300 or 500 fish per hectare, carp 

 weighing 1 pound may be obtained during the first summer. 

 ' The raising-pond No. 3 is stocked with carp of one summer, counting 

 520 fish per hectare [2.^ acres] ; and if fish of prey are kept out by 

 means of a gravel grating, one will in autumn get of this number 500 

 carp of two summers, weighing from 1 to IJ pounds and rarely 2 

 pounds (but not the latter unless the number of carp per hectare has 

 been less than 520). 



The stock pond Dubisch stocks with 206 carp of two summers per 

 hectare, and gets in autumn 200 carp less than two and one-half years 

 old, weighing from 2 to 4 pounds. 



From the above we gain the following relative size of the different 

 classes of ponds. This relative size will, of course, be changed, if there 

 is a change in the number of fish with which the ponds are stocked, in 

 the losses and in the growth of the fish, or if some of the fish are sold 

 before they have reached the age of two or two and one-half years. In 

 making the calculation the average weight of 2.2 pounds per fish has 

 been made the basis. This weight had in 1883 been reached by the 

 carp on the estate of Perstetz, near Teschen, where pond farming had 

 been carried on according to the method described above. 



A total pond area of 544.6 hectares therefore yields annually 66,690 

 carp, at 2.2 pounds, or 146,718 pounds, i. e., 269.4 pounds per hectare. 



ECKAEDT'S method of OBTAININa EMBEYONATED CARP EG-GS. — 



A spawning pond of 0.1 hectare [one-fourth acre] is stocked with 



