Dissertation
Dissertation > Agricultural Sciences > Aquaculture, fisheries > Aquatic basic science > Aquatic Biology > Aquatic Botany

Uptake of Dissolved Inorganic Nitrogen by Microalgae in the Shrimp Pond

Author WangYaQiong
Tutor HuangXiangZuo
School Guangdong Ocean University
Course Marine biology
Keywords Porgy oocysts algae Shrimp ponds Stable isotope Ammonia Nitrite nitrogen Nitrate nitrogen Absorption rate
CLC S917.3
Type Master's thesis
Year 2011
Downloads 24
Quotes 2
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The Poggi oocysts algae (Oocystis borgei) is a common farming in the late shrimp ponds dominant species, has in the shrimp high pool wide distribution, population stability, ability to adapt to the characteristics of breeding water quality control is of great significance. This paper tracking and monitoring from April to July 2010, East island of Zhanjiang City 3 intensive Litopenaeus shrimp (Litopenaeus vannamei) aquaculture ponds nitrate nitrogen, nitrite nitrogen, ammonia nitrogen content changes, and the water temperature, dissolved oxygen the changes were measured; Porgy oocysts algae under different nitrogen concentrations and algal concentrations of inorganic nitrogen absorption efficiency compared under different temperature, the seawater relative density and light intensity conditions Porgy oocysts algae on inorganic nitrogen absorption efficiency. Biological regulation of shrimp pond water quality in order to provide a theoretical basis. The experimental results are as follows: 1, during the shrimp farming, ammonia nitrogen content showed early slightly higher mid-low the late trend, changes in the range of 0.011 ~ 0.882 mg · L -1 , averaged 0.155 mg · L -1 . Nitrite nitrogen content is relatively stable in the early and mid-late was increased, the changes in the range of 0.005 ~ 0.103 mg · L , -1 , an average of 0.020 mg · L , -1 . Nitrate nitrogen content of the relatively large fluctuations, changes in the range of from 0.001 to 0.811 mg · L -1 average of 0.193 mg · L -1 . Proposed in the breeding process, select a longer growth cycle, algae relative stability of the microalgae put in the shrimp ponds. 2, during the shrimp farming, the range of inorganic nitrogen content of 0.040 ~~ 1.294 mg · L -1 , an average of 0.368 mg · L --1 . No obvious trend of inorganic phosphorus content, ranging from of 0.019 ~~ 0.235 mg · L -1 , an average of 0.066 mg · L -1 , shrimp pond water eutrophication serious. Shrimp farming period, the range of nitrogen to phosphorus ratio (IN / IP) from 0.474 to 20.575, an average of 5.984. Less than 5.000 the period accounted for the entire breeding cycle of 48%, IN as experimental shrimp ponds phytoplankton growth limiting factor. Shrimp farming period, water temperature presents the trend of pre-, low-, mid-and late changes in the range of 22.54 to 31.48 ° C, pre-breeding water temperature is low, the fluctuations, increased to about 30 ℃ maintain nearly three months. Is recommended that in mid April Fangmiao. 5, during the shrimp farming, the dissolved oxygen content showing the trend of previous high and low late in the 5.040 to 9.880 mg · L -1 range fluctuations Late in the breeding, should strengthen aquaculture water fight oxygen. 6, the test range Neibo Ji oocysts alginic rate of absorption of the different concentrations of nitrate nitrogen has a significant difference (P LT; 0.05), highest when the nitrogen concentration of 14.300 mg · L -1 the lowest for 73.173ug · g -1 · h -1 , the nitrogen concentration of 3.300 mg · L -1 for 42.161ug · g -1 · h -1 ; Poggi oocysts algae of different concentrations of nitrite nitrogen absorption rate were significantly different (P lt; 0.05), when the nitrogen concentration highest 14.300 mg · L -1 for 81.120ug g -1 · h -1 , the nitrogen concentration of 3.300 mg · L -1 , the lowest for 24.252ug g -1 · h -1 ; Porgy oocysts algae of different concentrations of ammonia nitrogen absorption rate has a significant difference (P LT; 0.05), highest when the nitrogen concentration of 14.300 mg · L -1 52.259 UG · g- -1 · h < sup> -1 , the nitrogen concentration of 96.800 mg · L -1 reached a minimum of 20.856 ug · g -1 · h -1 . Therefore, the low concentration of nitrogen or high concentrations of nitrogen Porgy oocysts algae on inorganic nitrogen uptake rate will decline. 7, the test range different Borgia the oocysts alginate concentration of nitrate nitrogen absorption rate there are significant differences (P LT; 0.05), when the algae concentration of 3.222 × 10 8 cell · L highest for the the to 9.767 ug · g -1 · h -1 -1 in algae concentration of 9.472 × 10 8 cell · L -1 , the 2.502 ug · g -1 · h -1 ; different of Porgy oocysts algae concentration nitrite nitrogen absorption rate of significant differences (P lt; 0.05), algae concentration of 3.222 × 10 8 cell · L -1 reached its highest for 6.912 ug · g -1 · h -1 , the algae concentration 9.472 × 10 8 cell · L -1 3.421 ug g -1 · h -1 ; different Porgy oocysts algae concentration of ammonia absorption rate were significantly different (P lt ; 0.05), algae concentration highest 4.784 × 10 8 cell · L -1 58.803 ug g -1 · h -1 , the algae concentration reached a minimum of 9.472 × 10 8 cell · L -1 31.833 ug · g -1 · h -1 . Porgy oocysts algae, algae concentration is too high inorganic nitrogen uptake rate decreased. 8, within the scope of the study at different temperatures Porgy oocysts algae nitrate nitrogen absorption rate was significantly different (P lt; 0.05), when the highest temperature of 30 ° C, 48.130 ug g -1 < / sup> · h -1 , reached a minimum temperature of 10 ° C for 12.904 ug g -1 · h -1 ; different temperatures Porgy oocysts algal the nitrite nitrogen absorption rate significantly different (P lt; 0.05), the highest temperature of 30 ° C, 27.421 ug · g -1 · h -1 , reached a minimum temperature of 10 ° C, 13.817 ug · g -1 · h -1 ; wave under different temperature Kyrgyzstan of oocysts algae on the absorption rate of ammonia, a significant difference (P lt; 0.05), the highest temperature of 30 ° C for 51.929 ug · g -1 · h -1 < / sup>, reached a minimum temperature of 10 ° C for 29.072ug g -1 the -1 . Porgy oocysts algae for growth at a high temperature, low temperature or ultra-high temperature makes Porgy oocysts algae on inorganic nitrogen absorption rate decreased. 9 test within Porgy oocysts algae in seawater relative density of nitrate nitrogen absorption rate was significantly different (P lt; 0.05), the the seawater relative density is 1.010 g · mL -1 the lowest when the highest for 14.501ug g -1 · h -1 in seawater relative density of 1.030 g · mL -1 , 8.305 ug g -1 · h -1 ; different seawater relative density Porgy oocysts algae the nitrite nitrogen absorption rate was significantly different (P lt; 0.05), in seawater relative density of 1.010 g · mL of -1 reached its highest 16.357ug · g -1 · h -1 , the relative density of the seawater to 1.005 g · mL -1 reached the lowest for 11.279ug · g -1 · h -1 ; the different seawater relative density Porgy oocysts algae ammonia absorption rate was significantly different (P lt; 0.05), the highest in the the seawater relative density of 1.010 g · mL -1 to 65.420 ug · g -1 · h -1 , the lowest in the seawater relative density of 1.030 g · mL -1 38.415 ug · g -1 · h -1 . Excessive water relative density causes of Porgy oocysts algae on inorganic nitrogen absorption rate decreased. 10, within the scope of the study under different light intensities Porgy oocysts algae nitrate nitrogen absorption rate was significantly different (P lt; 0.05) in illumination for 45.000umol · m -2 · s < highest sup> -1 for 11.100ug g -1 · h -1 in illumination 153.000umol · m -2 · s -1 , the lowest, the 2.502 ug · g -1 · h -1 ; different light intensities wave Kyrgyzstan oocysts algal of nitrite nitrogen absorption rate, a significant difference (P lt; 0.05), in the illumination of 45.000umol · m -2 · s -1 highest for 15.340ug g -1 · h -1 , illumination 153.000umol · m -2 · s -1 when you reach the minimum, 2.355 ug g -1 · h -1 ; different light intensities Porgy oocysts algae ammonia absorption rate The highest significant difference (P lt; 0.05) in the illumination of 45.000umol · m -2 · s -1 for 14.077ug · g - 1 · h -1 , illumination 153.000umol · m -2 · s -1 meet minimum to 3.618 ug · g -1 · h -1 . Glare can make it Porgy oocysts algae on inorganic nitrogen uptake rate decline.

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