Effects and solutions of carbon dioxide on fish in recirculating aquaculture systems
In 2020,the Ministry of Agriculture and Rural Affairs initiated the implementation of the"Five Major Actions"for promoting green and healthy aquaculture technologies,aiming to utilize cutting-edge technologies to guide aquaculture activities.In the new recirculating aquaculture system,with the increase of aquaculture production,the effect of carbon dioxide on fish has been concerned.At present,the circulation of carbon dioxide in recirculating aquaculture systems lacks systematic arrangement,and the recirculating aquaculture systems has the necessary treatment of carbon dioxide and the treatment method needs to be improved.Therefore,this study summarizes the current development trend and main innovative achievements by summarizing the domestic and foreign literature.Specifically,it includes:gradually establishing awareness of carbon dioxide sources and balance systems;exploring the relationship between carbon dioxide and alkalinity,pH,carbon dioxide partial pressure,and the need to further explore the synergistic effect of multiple parameters in the day and night;summarizing multiple diseases induced by carbon dioxide,focusing on the problems of hypercapnia and renal calcification caused by carbon dioxide,reducing potential stress caused by carbon dioxide accumulation through physical,chemical and biological regulation measures,thereby mitigating the harm of carbon dioxide to fish.it is necessary to further study the effects of long-term exposure on fish growth and health in the future.By adding chemical reagents,improving aeration methods,and screening high-quality treatment organisms to reduce the content of carbon dioxide in the recirculating aquaculture system,it is necessary to design new reactors to improve the fixation efficiency.This study provides solutions and theoretical basis for effectively removing accumulated carbon dioxide in recirculating aquaculture.