Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (2): 135-141.doi: 10.11924/j.issn.1000-6850.casb2021-0890

Special Issue: 水产渔业

Previous Articles     Next Articles

Characteristics of Phytoplankton Community in Integrated Multi-Trophic Aquaculture Seawater Ponds

FANG Minjie()   

  1. Fisheries Research Institute of Fujian, Xiamen, Fujian 361013
  • Received:2021-09-17 Revised:2022-04-06 Online:2023-01-15 Published:2023-01-17

Abstract:

In order to study the changes of phytoplankton community in fish-shrimp-shellfish integrated multi-trophic aquaculture seawater ponds and provide a scientific basis for the optimization of culture model and the ecological regulation of aquaculture ponds, sampling and detection were carried out regularly to analyze the phytoplankton community in water and its correlation with nutrient content during the culture period. The results showed that the species number of phytoplankton in the ponds was higher than that in the natural sea areas. The cell density of phytoplankton in the ponds was higher than that in the natural sea areas in the middle and late stage of culture, except that it was slightly lower in the early stage of culture. Skeletonema costatum was the dominant species in the early stage of culture, Scippsiella trochoidea was the absolute dominant species in the middle stage, and Skeletonema costatum, Karenia mikimotoi and Scippsiella trochoidea were the main species in the later stage. The fluctuations of phytoplankton diversity index (H') and evenness index (J) in the ponds were significantly greater than those in the natural sea areas. It showed a trend of succession of phytoplankton community in the ponds from diatoms to dinoflagellates, while diatoms were absolutely dominant in the natural sea areas. There was a significant correlation between the cell density of Karenia mikimotoi and the content of active phosphate.

Key words: integrated multi-trophic aquaculture, seawater ponds, phytoplankton community, nutrient correlation