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- Title
The effect of sublethal concentrations of the water-soluble fraction of crude oil on the chemosensory function of Caspian roach, Rutilus caspicus (YAKOVLEV, 1870).
- Authors
Lari, Ebrahim; Abtahi, Behrooz; Hashtroudi, Mehri Seyed; Mohaddes, Effat; Døving, Kjell B.
- Abstract
The water-soluble fraction of crude oil is a complex and toxic mixture of hydrocarbons. Because aquatic organisms directly encounter it, the water-soluble fraction plays an important role in the toxicity of crude oil in aquatic environments. To determine whether fish are attracted to or avoid the water-soluble fraction, Caspian roaches ( Rutilus caspicus) were exposed to different concentrations of the water-soluble fraction in a choice maze apparatus. The results showed that Caspian roaches can detect and avoid 2 mg/L of the water-soluble fraction. To study the effect of the water-soluble fraction on the olfactory function of fish, Caspian roaches were exposed to 3.2 mg/L and 16 mg/L of the water-soluble fraction for 96 h; afterward, exposed fish encountered food extract in a choice maze apparatus. The present study showed that the water-soluble fraction significantly impairs the olfactory function of roaches. To investigate the effect of olfactory system dysfunction on the feeding behavior of fish, Caspian roaches were exposed to 3.2 mg/L and 16 mg/L of the water-soluble fraction. After 4 d, 8 d, and 12 d of exposure, the feeding behavior toward the food extract was tested. The results showed that both 3.2 mg/L and 16 mg/L of the water-soluble fraction suppress the feeding behavior of Caspian roaches. The present study demonstrates that sublethal concentrations of crude oil's water-soluble fraction impair the olfactory function of fish and consequently suppress the feeding behavior. Environ Toxicol Chem 2015;34:1826-1832. © 2015 SETAC
- Subjects
RUTILUS; EFFECT of oil spills on fishes; CHEMORECEPTORS; HYDROCARBONS &; the environment; BIOCONCENTRATION
- Publication
Environmental Toxicology & Chemistry, 2015, Vol 34, Issue 8, p1826
- ISSN
0730-7268
- Publication type
Article
- DOI
10.1002/etc.2994