A comparative study of the nutrition of climbing perch Anabas testudineus (Bloch, 1792)–fed with granular food with positive buoyancy in the light (~100 lux), in darkness, and under infrared light (780–900 nm) has been performed. It is found that climbing perch can eat equally as well in darkness and under infrared light (37 and 30% of the feeding granules), albeit much worse than in the light (73% of the granules). The fish instantly reacted to the feed and began consuming it in the light, but they captured the first granules under infrared light only on average more than 2 min after the experiment started. This indicates that climbing perch have no visual reaction to food under infrared light.
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We are grateful to the staff of the Coastal Branch of Russian–Vietnamese Tropical Research and Technological Center; M.A. Ruchiev (Karelian Research Center of the Russian Academy of Sciences); Tran Duc Dien for assistance in collecting and processing the material; K.I. Boyko (Severtsov Institute of Ecology and Evolution of the Russian Academy of Sciences) for spectral analysis of infrared LED radiation; and A.O. Kasumyan (Moscow State University), V.V. Kostin, D.D. Zvorykin, and V.A. Bastakov (Severtsov Institute of Ecology and Evolution of the Russian Academy of Sciences) for valuable comments on the text of the manuscript.
The material was collected with financial support from the Russian–Vietnamese Tropical Research and Technological Center (project Ecolan 3.2); the analysis of the material and preparation of the article were supported by the Russian Science Foundation (project no. 19-14-00015).
Conflict of interests. The authors declare that they have no conflict of interest.
Statement on the welfare of animals. All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.
Translated by V. Mittova
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Pavlov, E.D., Ganzha, E.V. & Pavlov, D.S. Climbing Perch Anabas testudineus Feeding in the Darkness: Observation in Infrared Light. Inland Water Biol 14, 117–120 (2021). https://doi.org/10.1134/S1995082921010090
- climbing perch Anabas testudineus
- feeding behavior
- infrared light