Method of Feeding Timing in Crab Ponds Based on Water Quality Parameter Fusion-Multivariate DeepAR Algorithm
Abstract
In China’s crab pond aquaculture industry, feed is mostly fed at fixed times, with little consideration of the actual feeding intensity of river crabs, resulting in low feed utilization efficiency. Changes in water quality in crab ponds directly affected the feeding intensity of river crabs. Based on this, combined with the multivariate DeepAR algorithm, a method for determining the optimal feeding time in crab ponds was designed. Eight water quality parameters, including dissolved oxygen content, water temperature, pH value, oxidation-reduction potential, electrical conductivity, total dissolved solids, ammonia nitrogen content, and turbidity, were selected as evaluation indicators. The three-scale analytic hierarchy process was chosen as the subjective weighting method, the CRITIC method based on the entropy weight method as the objective weighting method, and game theory as the combined weighting method. A crab pond water quality scoring method was constructed by using the subjective-objective combined weighting method. Taking time series, dissolved oxygen content, and turbidity as characteristic values, and the crab pond water quality score as the target, the multivariate DeepAR algorithm was used to predict the changes in the water quality score curve over the next 12h. The peak of the curve represented the maximum water quality score, at which time the feeding intensity of river crabs was the highest. Therefore, the peak stage of the curve was defined as the optimal feeding time. The results showed that the crab pond water quality scoring method had a good correlation with the actual feeding activities of river crabs, and the multivariate DeepAR algorithm can better predict the changes in the water quality score curve over the next 12h, which can guide the feeding process of river crabs.
Keywords: fusion of water quality parameters, multivariate DeepAR algorithm, game theory, feeding intensity of river crabs, feeding timing in crab pond
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