Abstract:
China has been the largest shrimp farming country in the world. As such , shrimp culture has also made a great contribution to the increase of farmers’ income and export earnings. In recent years, the performance of intensive aquaculture system was seriously affected by a large amount of nitrogen that discharged into the aquaculture water body. Normally, a conventional solution to this problem is to drain a lot of water for water exchange in the intensive aquaculture system. In this case, most water resources can be overly consumed to waste in the aquaculture system. Alternatively, the industrial recirculating aquaculture system can be selected due to its good system closure, but the high cost of equipment input and operation have limited its large-scale application in industrial aquaculture of prawn. In this paper, a set of simple industrial shrimp culture system with circulating water was designed to develop a protein separator removal system TSS (total suspended solids) and aged microalgae, where the collection and drainage effect of culture pool were strengthened using the self-developed collection tray. An experiment related to industrial shrimp culture was carried out to control the water quality. The results showed that the average concentration of total ammonia nitrogen was (0.4±0.16) mg/L, significantly lower than the control group (0.96±0.62) mg/L, P<0.05. The average concentration of dissolved oxygen in the control group was (5.39±1.15) mg/L, dramatically lower than that in the test group (6.18±0.68) mg/L, P<0.05. The average concentration of nitrous oxide in the control group was (1.17±0.59) mg/L, significantly higher than that in the test group (P<0.05). The average concentration of TSS in the test group was (68.33±39.72) mg/L, lower than that in the control group (147.14±94.18) mg/L, P<0.05. The average number of Vibrio parahaemolyticus in the experimental group was (140±113.83) CFU/mL, lower than that in the control group (661.34 ± 473.96) CFU/mL, P < 0.05. After the age of 30 days, the body weight of the test and control group were (1.05 ± 0.15) g and (0.98 ± 0.26) g, respectively, whereas, the body length was (4.95 ± 0.56) cm and (4.86 ± 0.69) cm, respectively, indicating that the difference between two groups was not correlated (P > 0.05). After the age of 60 days, the body weight of the test and control group were (5.26±0.82) g and (6.12±1.76) g, respectively, whereas, the body length was (8.17±0.92) cm and (9.12±0.81) cm, respectively, indicating that the difference between two groups was significant correlated (P < 0.05). After the age of 90 days, the body weight of the test and control group were 13.89±1.23 g and 20±1.58 g, respectively, while, the body length was (12.26±1.98) cm and (14.06±1.68) cm, respectively, indicating that the difference between two groups was significant correlated (P<0.05). In terms of survival rate, the shrimp size of the test and control group were 82.62%±5.64% and 18.29%±4.63%, respectively, with significant difference (P<0.05). The single output of the test and control group were (3.44±0.85) kg/m3 and (1.09±0.23) kg/m3, respectively, indicating a significant difference (P < 0.05). This finding can offer a promising method to accurately monitor the water quality in an intensive aquaculture system for the shrimp farming.