NOTES ON FOREIGN FISH CULTURE AND 

 FISHERIES* 



MANURING PONDS 



With the various views and experiences which have here- 

 tofore been pubhshed in your esteemed journal permit me 

 to bring to general knowledge my own methods, which have 

 in practice for some years proved themselves to be of the 

 best. I own two nurse-ponds, of 2 and 3 hectares (5 to 7 

 acres) area respectively, whose water supply I can regulate 

 at pleasure. They lie dry from the middle of October to 

 the end of May. In April they are dressed with air-slacked 

 lime and plowed about 9 inches deep. The bottom is humus, 

 with a clay subsoil. The last of June I begin the applica- 

 tion of human and animal excrement — not direct on the 

 edges of the nurse-ponds, but in so-called crustacea-ponds, 

 15 to 20 qm. (150 to 200 sq. ft.) in area and about 1 meter 

 (39 in.) deep which are located about 4 meters (13 ft.) 

 above the nurse-ponds and communicate with them. In a 

 short time — in warm weather 10 or 14 days — the water 

 assumes a greenish color and these ponds swarm with life, 

 of which I let some into the nurse-ponds at intervals of 8 

 days or so, according to the water temperature. Thereby, 

 in my opinion, not only is the infecting of the water in the 

 nurse-ponds prevented, but the fry find always a table set, 

 and an exhaustion of the natural food in the pond is pre- 

 vented. I cease supplying this food at the beginning of 

 October. Last year I fished out in the seven-acre pond 

 65,000 carp yearlings 6 to 12 cm. (21/0 to 5 in.) long. This 

 year, unfortunately, 15 trout got in and the yield is there- 

 fore very small. — Correspondent of " Fischer ei-Zeitung " 

 (Neiidamrn), November /j, ipop. 



*Selected and translated by Mr. Charles G. Atkins and presented as 

 the fourth report of the Committee on Foreign Relations of which 

 Mr. Atkins is chairman. 



