Behavioral responses of fish exposed to hypoxanthine-3-n-oxide and perspectives for applicability in the hydroelectric sector
DOI:
https://doi.org/10.6008/CBPC2179-6858.2022.010.0019Keywords:
Epidermal cells, Protection of the ichthyofauna, Repulsive response, Alarm substancesAbstract
The olfactory reception of chemical signals in aquatic habitats can increase fish survival, allowing individuals to avoid risky situations. The alarm substances, extracted after damage to the epidermal cells of fish, is one of the most efficient signals in the Ostariophysi group (72% of freshwater species). Hypoxanthine-3-N-oxide (H3NO) is indicated as one of the possible active components of alarm substances that cause behavioral changes. The possibility of confining the ichthyofauna in the suction tube in hydroelectric plants, during preventive maintenance of the generating units, demands effective strategies to protect the ichthyofauna. In this perspective, the potential of hypoxanthine-3-N-oxide as a method of deterring ichthyofauna was analyzed. Assays in aquariums (100 L) instrumented with sample introduction and image acquisition systems remotely were developed with different concentrations of hypoxanthine-3-N-oxide (1.5 to 6.0 µg L-1) and species (n=30) of Matrinxã (Brycon cephalus) and Tambaqui (Colossoma macropomum). The results indicated, at H3NO concentrations of 3.0 and 6.0 µg L-1, unusual behavioral changes such as lethargy, foraging for the bottom of aquariums and attacks among fish, inferring the potential of hypoxanthine-3-N-oxide in inducing alarm signals as a candidate for the development of ichthyofauna protection methods applied to the hydroelectric sector.
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