| 【Objective】 The study was to evaluate the dynamic changes of water quality of Pelteobagrus
fulvidraco ponds with different feeding rates and explore the effects of different exogenous feed inputs on the water
quality of P. fulvidraco ponds in order to provide reference for the ecological restoration of large-scale culture ponds of P.
fulvidraco. 【Method】 In P. fulvidraco ponds, the feeding rates of 1.0%, 1.5%, 2.0%, 2.5% and 3.0% were set, and the
main environmental factors in each group were monitored regularly. Combined with Grey Relational Analysis, Principal
Component Analysis (PCA) was used to evaluate the water quality and health status of each pond. Based on the comparative analysis of water quality evaluation results, a feed input model for P. fulvidraco ponds based on good water quality was put
forward. 【Results】 The results showed that CODMn, DO, TN, TP and NH3-N were the main environmental factors affecting
the water quality of P. fulvidraco culture ponds. The pH value had extremely high correlation with other environmental factors,
and the TN had significant correlation with TP and NH3-N. Among five experimental groups, the water quality of group A pond
(feeding rate: 1.0%), group B pond (feeding rate: 1.5%), group C pond (feeding rate: 2.0%), group E pond (feeding rate: 3.0%)
reached water quality grade of class Ⅲ in all stages, which is consistent with the water quality of aquaculture. The water quality
of group D pond (feeding rate: 2.5%) reached water quality grade of class Ⅳ in the middle stage of aquaculture, and the contents
of TN and TP in the water exceeded those of the standard levels, therefore, the water quality pollution was serious. At the
same time, the comprehensive scores of principal components in group A, B and C were 1.2704536, 1.2704664 and 1.270464,
respectively, and the water quality was in good condition. 【Conclusion】 The experimental groups with feeding rates of 1.0%-
2.0% have the best water quality, and excessive feeding rate will reduce the quality and health of aquaculture water. |
