Studies on water quality changes in coupled system of circulating water aquaculture of rice-crab cocultivation ponds
LI Min
LI Kui
GUO Jinliang
SUN Jingyu
QIU Wenjie
SHI Wei
GUAN Weibing
Abstract：In order to explore the purification effect of rice crab cocultivation fields on the circulating wa-ter aquaculture system in a coupled system of rice crab co cultivation ponds,the water quality of the in-lets and outlets and the intermediate water of in-pond raceway system,rice-crab culture and ecological ditch system were tested in 2021.At the same time,five sites were selected to monitor the water quali-ty of the in-pond raceway system.The studies showed that the variation range of dissolved oxygen in pond raceway system is from 3.59 to 11.3 mg/L,the variation range of phosphate is from 0 to 0.129 mg/L,and the variation range of acidity is from pH 8.43 to pH 9.03.In-pond raceway system can pro-vide water with high dissolved oxygen and purify most of the dissolved phosphate.The rice-crab culture can reduce about 91.79％of ammonia nitrogen and 71.15％of nitrite nitrogen.It can purify the tail water of the in-pond raceway system,which is beneficial to the growth of fish.The coupled system of circulating water aquaculture in rice crab cocultivation ponds is an ideal ecological aquaculture model.
Keywords：in-pond raceway systemrice-crab culturewater qualityecological aquaculture
Publication Date：2025-06-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：8( 186-193 )