Abstract
The growth of cyanobacteria (blue-green algae) is a typical phenomenon in water bodies worldwide. The use of silver carp (Hypophthalmichthys molitrix) to reduce excessive phytoplankton development is controversial. In the case of cyanobacteria, many of which are toxic, understanding their possible digestion mechanism by fish is particularly desirable. A unique methodical approach, which consists of applying intestinal contents or extracts to a cyanobacteria culture, was used. Unicellular cyanobacteria (Cyanothece) were incubated in vitro with bile, contents of different parts of the intestinal tract, and cytosolic and microsomal extracts of the intestinal tissue of silver carp. The abundance of cyanobacteria decreased in all treatments containing either exclusively bile or its combination with intestinal contents. This research provides the first evidence of non-mechanical digestion of cyanobacteria by silver carp. Cyanobacteria incubated with intestinal contents or extracts reached mostly higher abundances than those incubated with the nutrient medium. The existence of non-mechanical digestion mediated via intestinal contents and extracts or its compensation connected with organic substance uptake is discussed.
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Acknowledgements
We wish to thank Jiří Šetlík for his help in the laboratory and for providing valuable comments.
Funding
This work was supported by the Ministry of Agriculture of the Czech Republic, project NAZV QK1710310, and by the Ministry of Education, Youth and Sports of the Czech Republic, projects CENAKVA (LM2018099), Biodiversity (CZ.02.1.01/0.0/0.0/16_025/0007370), and GAJU (No. 081/2016/Z).
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The experiments were performed and the experimental fish were handled in accordance with national and international guidelines for the protection of animal welfare (EU-harmonized Animal Welfare Act of the Czech Republic). The unit is licenced (No. 2293/2015-MZE-17214 and No. 55187/2016-MZE-17214 within project NAZV QK1710310) according to the Czech National Directive (the Law against Animal Cruelty, No. 246/1992).
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Šetlíková, I., Maciarzová, S., Bláha, M. et al. Silver carp (Hypophthalmichthys molitrix) can non-mechanically digest cyanobacteria. Fish Physiol Biochem 46, 771–776 (2020). https://doi.org/10.1007/s10695-019-00751-1
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DOI: https://doi.org/10.1007/s10695-019-00751-1