| 【Objective】 The objective of the study was to explore the ecological benefits of Sparuslatus and Siganus
fuscessens in two 1 000 m2 aquaculture ponds for Penaeus monodon. 【Method】 A test was conducted to compare the
change of nutritive salt, content of particulate material, growth performance of phytoplankton, zooplankton and other indexes in P. monodon“Nanhai No.2”- Sparuslatus (Sparuslatus polyculture treatment, XZ pond) polyculture pond and the change
of such indexes in P. monodon“Nanhai No.2”- S. fuscessens (S. fuscessens polyculture treatment, XL pond) polyculture
pond in 105 days. 【Results】 The results showed that the contents of ammonia nitrogen (NH4
+-N), total nitrogen (TN), total
phosphorus (TP), soluble reactive phosphorus (SRP) and particulate matter in XZ pond and XL pond were increased during
the entire experiment. At the middle and later experiment period, the dissolved nitrogen in the XZ pond was lower than that
in the XL pond while the TN content in the XZ pond was higher than that in the XL pond and the difference became more
significant in the late experiment period. Meanwhile, the particulate matter content in XZ pond was higher than that in the XL
pond, which indicated that the higher TN content in XZ pond was from suspended particulate matters. The ranges of variation
of plankton and chlorophyll a content in the two ponds were 6.83-18.65 μg/L and 5.34-16.24 μg/L, respectively, showing no
significant difference. 【Conclusion】 The experimental results indicated that the bioturbation of Sparuslatus could boost the
transportation of organic matter from the bottom to the upper body of the pond, which was beneficial to reduce the accumulation
of NH4
+-N, NO3
--N and other substances, and promote the material circulation in the pond culture system. The survival rate
of P. monodon“Nanhai No.2”and fish sampling results indicated that the Sparuslatus and S. fuscessens could be cultured
with P. monodon“Nanhai No.2”directly to achieve higher economic benefits. Further study needs to be conducted on the
feed filtration capacity of Sparuslatus and S. fuscessens on different phytoplankton with different particle sizes in culture ponds
because of the importance of phytoplankton in the water. |
