Title: Variation rules of water quality and budget of nitrogen and phosphorus in ponds with grass carp as the dominant cultured species.
Abstract: An experiment was conducted for a period of 283 days without water exchange(close system) to determine the effects of feeding on the variation rules of water quality and the budget of nitrogen and phosphorus in ponds with grass carp as the dominant cultured species.During the breeding,water quality was measured for 10 times.The results showed that the concentrations of ammonia nitrogen,nitrate nitrogen,suspended solids increased with the extension of feeding time,reached the highest on September 23rd,the concentrations of nitrite nitrogen and total nitrogen had the maximal on November 1st,after that,significantly dropped.Total phosphorus concentration in water increased with the progress of rearing;at the end of the trial,total phosphorus concentration extend to the maximum.During the whole period of the experiment,ammonia nitrogen varied from 0.28 to 0.92 mg/L,nitrite nitrogen from 0.03 to 0.13 mg/L,nitrate nitrogen from 0.08 to 0.75 mg/L,total nitrogen from 2.24 to 3.92 mg/L,suspended solids from 29.33 to 90.67 mg/L and total phosphorus from 0.19 to 0.63 mg/L.By the end of the experiment,water quality parameters of ammonia nitrogen,nitrite nitrogen,nitrate nitrogen,total nitrogen,suspended solids and total phosphorus increased by 104%~114%,74%~122%,687%~694%,48%~52%,121%~131% and 215%~238%.Within the ponds,35.4%~37.9% of the input N and 18.9%~20.2% of the input P were converted to harvested fish,the largest proportion was contained in water and sediment.
Publication Year: 2009
Publication Date: 2009-01-01
Language: en
Type: article
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Cited By Count: 1
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