WATER QUALITY UNDER DIFFERENT POND MANAGEMENT | ||||
| Egyptian Journal of Agricultural Research | ||||
| Article 26, Volume 75, Issue 4, December 1997, Page 1163-1173 PDF (2.78 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejar.1997.426506 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| ZEINAB A. NAGEDY | ||||
| Central Laboratory of Aquaculture Research, Abbassa, Agricultural Research Centre, Giza, Egypt | ||||
| Abstract | ||||
| Temperature, visibility, pH, dissolved oxygen, total hardness, total alkalinity, orthophosphate-phosphorus, chlorophyll-a and phytoplankton-zooplanton abundance were measured frequently in polyculture ponds, of which two ponds were fertilized with urea and superphosphate (1st treatment); two ponds were fertilized with urea, superphosphate and supplied with supplemental feed (17% protein) at 3% of fish biomass (2nd treatment), and two ponds were used as control. The experiment extended from September 1992 to February 1993 for two seasons, fall and winter. Data of the two seasons showed that the average concentration of PO4-P and NH4-N decreased, while, NO3-N increased from fall to winter in all treatments. No treatment effect was observed for nitrate (NO3-N), ammonia (NH4-N) in the chemical fertilizer and control treatments. Phytoplankton and zooplankton abundance were significantly different (P<0.05) between treatments, the hightes abundance was in 1st treatment. Net fish production were 89.2, 599 and 1079 kg/ feddan in control, 1st and 2nd treatments, respectively. | ||||
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