Construction and Operation Test of Simple Recirculating Aquaculture System for Polyodon spathula
Abstract
Aiming at the problems of complex composition, high construction and operation cost of industrial recirculating aquaculture system, and certain difficulty in popularization and application in aquaculture, a simple recirculating aquaculture system was constructed. The recirculating aquaculture system was composed of a reservoir, a breeding pond, a water level control device, a micro-filter, a biological filter and a circulating pump. Based on the principle of gravity self-flow, the equipment of each breeding facility was configured, and the diameter ratio of the water circulation pipeline of the breeding system was optimized. A 90-day breeding experiment was carried out with the Polyodon spathula as the object to evaluate the stage operation effect and economy of the system. The experimental results showed that the water circulation of the system was stable;during the breeding process, the water temperature, dissolved oxygen concentration and pH value of the system ranged from 12.30℃ to 24.57℃, 3.96mg/L to 9.32 mg/L and 6.82 to 7.60, respectively. The average values of ammonia nitrogen concentration, nitrite nitrogen concentration and nitrate nitrogen concentration were (1.26±0.62)mg/L, (0.38±0.12)mg/L and (72.39±14.94)mg/L, respectively. The removal rates of ammonia nitrogen and nitrite nitrogen were 49.07% and 62.00%, respectively. The average weight of Polyodon spathula was increased from (144.83±15.24) g to (437.93±60.98) g. The final culture density was 15.48kg/m3,the feed coefficient was 1.08, and the survival rate was 96.16%. Based on the breeding cycle of 12 months, the feeding cost was estimated to be about 17.57 RMB/kg. The simple recirculating aquaculture system constructed ran stably, the treatment capacity of aquaculture water was good, and the cultivation of Polyodon spathula can obtain good economic benefits, which can provide reference for the popularization and application of industrial recirculating aquaculture system.
Keywords: aquaculture, recirculating aquaculture system, simple style, Polyodon spathula
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