Temporal-Spatial Variations and Nutrient Status in the Aquatic Environment of Deep-Water Cage Aquaculture in Houshui Bay
The effects of cage aquaculture on the aquatic environment of Houshui Bay were studied.The data from aquatic environment surveys for deep-water cage aquaculture that were conducted in May,August,Oc-tober 2018 and January 2019 were collected.The environmental factors were compared between the cage area and control area.The organic pollution index and eutrophication index were adopted to evaluate the eutrophi-cation level of the marine area with deep-water cage aquaculture and explore the relationship between eu-trophication and environmental factors.The results showed that pH values,Dissolved Inorganic Nitrogen(DIN),Dissolved Oxygen(DO),Dissolved Inorganic Phosphorus(DIP),and Chemical Oxygen Demand(CODMn)met the standards of class I seawater quality.There was no significant difference in environmental factors between the cage area and the control area(P＞0.05).Spring and winter were more suitable for the growth of phytoplankton,while in summer and autumn,phytoplankton growth and reproduction were limited by DIP.The organic pollution index indicated that the seawater in Houshui Bay had good quality and no or-ganic pollution.The eutrophication index indicated that the eutrophication level was high during the peak pe-riod of feeding in aquaculture,and the eutrophication was serious in the cage area,which was mainly influ-enced by Total Phosphorus(TP)and Total Nitrogen(TN).In the future,efforts should be made to strength-en the environmental monitoring of deep-water cage aquaculture in Houshui Bay,so as to avoid the long-term cumulative impact of aquaculture on the water quality.
万方数据
维普
