Effects of different LED light spectra on rainbow trout ( Oncorhynchus mykiss ): in vivo evaluation of the antioxidant s
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Effects of different LED light spectra on rainbow trout (Oncorhynchus mykiss): in vivo evaluation of the antioxidant status Uğur Güller & Şükrü Önalan & Muhammed Arabacı & Boran Karataş & Muhterem Yaşar & Ömer İrfan Küfrevioğlu Received: 21 February 2020 / Accepted: 24 August 2020 # Springer Nature B.V. 2020
Abstract Rainbow trout (Oncorhynchus mykiss) farming is one of the major aquacultures in Turkey. Some conditions in fish farming can induce oxidative stress leading to the deterioration in properties such as appearance/color, texture, and flavor in fish meat. This situation may cause the consumer not to prefer edible fish. Although there are some studies on the impacts of light intensity on fish welfare, the changes in the antioxidant enzyme activities have not been elucidated. In the current study, it was intended to examine in rainbow trout how cultivating under different wavelengths affects the antioxidant enzymes and acetylcholine esterase (AChE) activity, because its activity is associated with oxidative stress, and also the determination of which light is suitable for fish welfare was aimed. Rainbow trout larvae were grown under four lights with different wavelengths: natural sunlight and incandescent long-wave (red light), medium-wave (green light), and short-wave (blue light) LED light. The experiment lasted for 64 days. Biochemical assays were carried on in the
brain, gill, and liver of rainbow trout. Antioxidant enzymes and AChE activity, which play an important role in the central nervous system, were assayed. In gill tissues, superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), glucose 6 phosphate dehydrogenase (G6PD), glutathione reductase (GR), glutathione S-transferase (GST), and AChE activities increased under all three light wavelengths. In the liver, while activities of antioxidant enzymes and AChE decreased in red light, all of them increased in blue and green light. In the brain, GPx, GST, G6PD, and SOD activities were reduced but AChE activity did not alter under all three light sources. In conclusion, light sources with different spectral structures caused important changes in the activities of antioxidant enzymes in rainbow trout. On this basis, it may be thought that this may be a response to the changing redox status of a cell. Based on our results, blue light sources may be suggested for fish welfare in rainbow trout culture, and providing fish welfare by changing light sources can be easy and cheap in fish farming.
U. Güller (*) Faculty of Engineering, Department of Food Engineering, Iğdır University, Iğdır, Turkey e-mail: [email protected]
Keywords Acetylcholine esterase . Antioxidant enzymes . Light wavelengths . Rainbow trout
Ş. Önalan : M. Arabacı : B. Karataş : M. Yaşar Faculty of Aquaculture, Department of Aquaculture, Van Yüzüncü Yıl University, Van, Turkey
Introduction
Ö. İ. Küfrevioğlu Faculty of Sciences, Department of Chemistry, Atatürk University, Erzurum, Turkey
Light is an important factor in the growth and survival of juvenile fish, a
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