Abstract:

Dissolved oxygen (DO) concentration in fish ponds has been widely directly related with fish floating head. Aiming at investigating the relationship between DO concentration and meteorological elements, water temperature and DO concentration in fish pond were observed online by Jingzhou agriculture meteorological trial station, and 25 actual cases were recorded from 2011 to 2012. It was indicated that DO concentration in fish pond was closely correlated with atmospheric temperature, water temperature, solar radiation, atmospheric pressure and relative humidity. In general, 6 h water temperature change (ΔT6), total radiation and atmospheric pressure were positively correlated with DO concentration; meanwhile, water temperature and relative humidity were negatively correlated with it. According to the daily investigating records, fish floating head events were mainly found between May and October, when relative humidity was increasing, atmospheric temperature was decreasing, atmospheric pressure was reducing, or light intensity was becoming weak, water DO concentration was always dropped significantly. According to the 25 cases, combined with the characteristics of meteorological factors, three concept models were put forward. Moreover, fish floating head forecast method and processes according to the data of meteorological observation were proposed preliminarily