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- W2384978888 abstract "This study was preformed to assess Gracilaria tenuistipitata var. liui Zhang et Xia absorption of the nitrogen and phosphorus from Penaeus monodon culture water and quantitative relation between Gracilaria and the shrimp during aquaculture water treatment. The Growth and the chemical composition of G. tenuistipitata var. liui Zhang et Xia fertilized by two sources——the synthetical fertilizer and the culture filtrate from Penaeus monodon, the nutrient absorption rates of the alga, and the nutrient excretion rates of the shrimp were measured. The result of the growth experiment showed that the daily growth rates and the crude protein content of G. tenuistipitata var. liui Zhang et Xia became higher with the increase of nutrient concentrations. However, in the same concentrations of the inorganic dissolved nitrogen and phosphorus, the daily growth rates and tissue components of the algae cultured with the different nutrient resources were statistically indistinguishable (p0.05). The result suggested that the inorganic dissolved nitrogen and phosphorus were the main nutrient factors that influenced the growth of the alga cultured in shrimp culture filtrate. The relation between nutrients excreted by the shrimp and nutrients absorbed by the alga was examined in the second experiment. The trend of the nitrogen excretion rate of shrimps went up with rising temperatures, but the nitrogen adsorption rates of G. tenuistipitata var. liui Zhang et Xia were statistically equivalent at 20℃～28℃, decreasing significantly at 32℃(p0.05). At temperatures of 20℃ and 24℃,the phosphorus excretion rate of the shrimp was less than the phosphorus absorption rate of the alga, and it is reverse at 28℃ and 32℃. It needed 1.93?g of the alga at 20℃ and 13.17?g at 32℃ to absorb the nitrogen excreted by 1g of the shrimp, but for phosphorus, 0.78?g at 20℃ and 1.17?g at 32℃ was needed, respectively. Therefore, if Gracilaria tenuistipitata var. liui Zhang et Xia was used to treat shrimp aquaculture water, estimation of the algal biomass added into the water basing on nitrogen and phosphorus excreted by shrimps plays a role in the effect of the treatment." @default.
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- W2384978888 date "2004-01-01" @default.
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- W2384978888 title "Absorption of nitrogen and phosphorus from shrimp culture water by gracilaria" @default.
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