Effects of different LED light spectra on rainbow trout (Oncorhynchus mykiss): in vivo evaluation of the antioxidant status

Güller U., Önalan Ş. , Arabacı M. , Karataş B. , Yaşar M., Küfrevioğlu Ö. İ.

Fish Physiology And Biochemistry, vol.46, no.6, pp.1-14, 2020 (Journal Indexed in SCI Expanded)

  • Publication Type: Article / Article
  • Volume: 46 Issue: 6
  • Publication Date: 2020
  • Title of Journal : Fish Physiology And Biochemistry
  • Page Numbers: pp.1-14


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.