NDLI: Effects of Crucian Carp (Carassius auratus) on Water Quality in Aquatic Ecosystems: An Experimental Mesocosm Study

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Effects of Crucian Carp (Carassius auratus) on Water Quality in Aquatic Ecosystems: An Experimental Mesocosm Study

Content Provider	MDPI
Author	Huang, Yehui Mei, Xueying Rudstam, Lars G. Taylor, William D. Urabe, Jotaro Jeppesen, Erik Liu, Zhengwen Zhang, Xiufeng
Copyright Year	2020
Description	The presence of omnivorous fish is known to affect aquatic ecosystems, including water quality. The effect, however, depends on the species in question, and our knowledge is limited on the effect of omnivorous crucian carp (Carassius auratus), a common and often the most numerous fish species in eutrophic shallow lakes in China. We conducted a 70-day outdoor experiment in mesocosms with and without crucian carp to examine whether this species adversely affects water quality by increasing the levels of total nitrogen (TN) and total phosphorus (TP), thereby stimulating the biomass of phytoplankton and increasing water turbidity. Compared with carp-free controls, the presence of crucian carp resulted in higher TN and TP in the water column, greater phytoplankton biomass and lower periphyton biomass, measured as chlorophyll a. Total suspended solids (TSS) also increased in the presence of fish. We conclude that crucian carp can increase TN and TP, enhance phytoplankton biomass, and increase water turbidity, thereby contributing significantly to the deterioration of the water quality. In addition to controlling external nutrient loading, the removal of crucian carp may help to improve water quality in warm shallow eutrophic lakes.
Starting Page	1444
e-ISSN	20734441
DOI	10.3390/w12051444
Journal	Water
Issue Number	5
Volume Number	12
Language	English
Publisher	MDPI
Publisher Date	2020-05-19
Access Restriction	Open
Subject Keyword	Water Environmental Engineering Water Science and Technology Crucian Carp Nutrient Phytoplankton Periphyton Sediment Water Quality
Content Type	Text
Resource Type	Article

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