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A histological and ultrastructural study of the skin of rainbow trout (Oncorhynchus mykiss) alevins exposed to different levels of ultraviolet B radiation

Paper ID Volume ID Publish Year Pages File Format Full-Text
29733 44432 2015 7 PDF Available
Title
A histological and ultrastructural study of the skin of rainbow trout (Oncorhynchus mykiss) alevins exposed to different levels of ultraviolet B radiation
Abstract

•Rainbow trout alevins were exposed to UV-B (69–95 μW cm−2) for 9 days.•UV-B irradiation (15 min per day) has detrimental effects on rainbow trout alevins.•Survival of rainbow trout alevins was negatively affected by UV-B irradiation.•UV-B irradiation reduced the microridges on pavement cells and a vast skin necrosis.•UV-B radiation caused hemorrhages and inflammation in the brain meningeal layer.

The current study was conducted to evaluate the effects of UV-B radiation on survival rate and histopathological changes in the skin structure and ultrastructure in rainbow trout (Oncorhynchus mykiss) alevins. In laboratory dark conditions, newly hatched rainbow trout alevins were exposed to two different doses of UV-B radiation (high dose: HD: 94.83 μW cm−2) and (low dose: LD: 68.75 μW cm−2) for 9 days (time of exposure: 15 min per day), whereas specimens kept in darkness served as a control group. At the end of the experiment, alevins exposed to HD-UVB had the lowest survival rate (43.9 ± 0.9%), whereas fish exposed to LD-UVB showed intermediate values (73.6 ± 0.4%) with regard to the control group (91.2 ± 0.2%). Light microscopic and scanning electron microscopic studies revealed necrosis, sunburned cells, epidermis lifting of the epidermis, reduced number of mucous cells, degeneration of mucous cells and destruction of pavement cell microridges in both UV-B exposed groups. Hemorrhage and inflation in the meningeal layer of the brain were also observed in 17% and 42% of fish exposed to LD- and HD-UVB, respectively.

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A histological and ultrastructural study of the skin of rainbow trout (Oncorhynchus mykiss) alevins exposed to different levels of ultraviolet B radiation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 147, June 2015, Pages 56–62
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us