NAGEDY, Z. (1997). THE EFFECT OF STOCKING RATE ON WATER QUALITY, SOIL CHEMISTRY AND FISH PRODUCTION. Egyptian Journal of Agricultural Research, 75(4), 1155-1161. doi: 10.21608/ejar.1997.426504
ZEINAB A. NAGEDY. "THE EFFECT OF STOCKING RATE ON WATER QUALITY, SOIL CHEMISTRY AND FISH PRODUCTION". Egyptian Journal of Agricultural Research, 75, 4, 1997, 1155-1161. doi: 10.21608/ejar.1997.426504
NAGEDY, Z. (1997). 'THE EFFECT OF STOCKING RATE ON WATER QUALITY, SOIL CHEMISTRY AND FISH PRODUCTION', Egyptian Journal of Agricultural Research, 75(4), pp. 1155-1161. doi: 10.21608/ejar.1997.426504
NAGEDY, Z. THE EFFECT OF STOCKING RATE ON WATER QUALITY, SOIL CHEMISTRY AND FISH PRODUCTION. Egyptian Journal of Agricultural Research, 1997; 75(4): 1155-1161. doi: 10.21608/ejar.1997.426504
THE EFFECT OF STOCKING RATE ON WATER QUALITY, SOIL CHEMISTRY AND FISH PRODUCTION
Central Laboratory of Aquaculture Research, Abbassa, Agricultural Research Centre, Giza, Egypt
Abstract
Monoculture system was carried out in common carp ponds treated with chemical fertilizers (urea-superphosphate) plus supplemental feed (1796 protein). Effect of three stocking rates 2100, 4200 and 6300 fish/feddan were tested on water quality, soil chemistry and fish production from 12 April to 4th November 1992, in 9 earthen ponds located in the experimental unit at Cental Laboratory for Aquaculture. At the highest stocking rate (630❑ fish/ feddan), organic matter accumulated reduced concentration of dissolved oxygen, increased chemical oxygen demand (COD) and concentration of ammonia-nitrogen. Slight differences in pH and orthophosphate-phosphorus in pond soil were realized in all treatments. Fish production increased and average individual fish weight decreased with increasing stocking density.
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