THE EFFECT OF STOCKING RATE ON WATER QUALITY, SOIL CHEMISTRY AND FISH PRODUCTION | ||||
| Egyptian Journal of Agricultural Research | ||||
| Article 25, Volume 75, Issue 4, December 1997, Page 1155-1161 PDF (1.53 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejar.1997.426504 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| ZEINAB A. NAGEDY | ||||
| 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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