Abstract:The photosynthetic activity of cyanobacteria (predominantly Microcystis spp.) after pass through the digestive tract of Crucian Carp and Gold Crucian Carp was determined by PAM fluorimeter(Dual-PAM-100) so as to argue if ingestion of cyanobacterial biomass by Crucian Carp and Gold Crucian Carp could be considered as one of the biological methods for the water bloom formation control. The results showed that fish digestion had a significantly effect (P<0.05) on the photosynthetic activity and growth of microcystis. The photosynthetic activity, Fv/Fo, Fv/Fm, ETR and qP, of phytoplankton from Crucian Carp guts after the fifth day and ΦPSII from the third day became significantly higher than that of phytoplankton from Gold Crucian Carp, while NPQ decreased during the incubation. The Fluorescence parameters, Fv/Fo, Fv/Fm, ΦPSII, ETR and qP, form goldfish passage, decreased sharply during the incubation. The Chlorophyll-a concentration and cell density of Microcystis from Crucian Carp gut passage decreased at the beginning, then increased, and finally restored to the level of the control. Moreover, Chlorophyll-a concentration had an extremely significant (P<0.01) positive correlation with the chlorophyll fluorescence parameters respectively. However, the Chlorophyll-a concentration and cell density of Microcystis from Gold Crucian Carp gut passage had a extremely significant (P<0.01) positive correlation with the chlorophyll fluorescence parameters, kept declining during the culture period and much lower than that of control, Finally, the Chlorophyll fluorescence and growth of Microcystis after Crucian Carp digestion droped at the beginning, and then restored gradually. But for Gold Crucian Carp, gut passage significantly damaged the photosynthetic activity of Microcystis. Since the Gold Crucian Carp was usually stocked as ornamental fishes, it isn’t suitable to be considered as cyanobacteria bloom control.
王银平, 赵勇, 曾庆飞, 孙明波. 杂食性鱼类排泄物中藻类光能活性研究[J]. 中国环境科学, 2013, 33(3): 524-529.
WANG Yin-Ping, ZHAO Yong, ZENG Qing-Fei, SUN Ming-Bo. Changes in the photosynthetic activity of Microcystis colonies after gut passage through omnivorous fish. CHINA ENVIRONMENTAL SCIENCECE, 2013, 33(3): 524-529.