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- Title
Evaluation of Physiological Stress of Grass Carp Chronically Exposed to Enrofloxacin Based on IBR Index.
- Authors
Cao, Xu-Qian; Wang, Xu; Liu, Bin; He, Shu-Wen; Cao, Zhi-Han; Xing, Shao-Ying; Li, Ping; Li, Zhi-Hua
- Abstract
Enrofloxacin (ENR) is a commonly used drug in aquaculture, and it is frequently detected in the aquatic environment. Data on ENR toxicity toward aquatic species are limited. This study was aimed at using different biomarkers to evaluate the possible toxic effects of grass carp (Ctenopharyngodon idella) exposed to 0 (control), 1, 100, and 10,000 μg/L enrofloxacin for 21 days as a sub-chronic exposure trial, oxidative stress biomarkers (including superoxide dismutase (SOD), catalase (CAT), reduced glutathione (GSH), and malondialdehyde (MDA)), neurotoxicity indicators (including acetylcholinesterase (ACHE) activity, nitric oxide (NO)), and digestive enzyme activities (including lipase (LPS), amylase (AMS) enzymes). In addition, an integrated biomarker response (IBR) index was utilized to evaluate the integrated toxic effects of ENR on grass carp. Our results demonstrated that ENR exposure significantly increased activities of CAT, LPS, and AMS. ENR exposure also significantly upregulated the expression levels of sod1, ACHE, LPL, ATGL, and AMY genes. Furthermore, histopathological changes were observed in the hepatopancreatic tissues of grass carp exposed to ENR. It was observed that higher IBR scores were noticed in the tissues of fish exposed to ENR, suggesting an induced biological response. The comprehensive biomarker index showed that CAT and ACHE activities have a higher response to ENR, and 100 μg/L has a greater impact on grass carp. These results indicate that ENR has a toxic effect on grass carp and impairs their physiological functions. This is the first study to explore the effects of ENR on grass carp, and it provides basic information for assessment of ENR effects in aquaculture.
- Subjects
CTENOPHARYNGODON idella; PHYSIOLOGICAL stress; DIGESTIVE enzymes; ACETYLCHOLINESTERASE; POISONS; FLUOROQUINOLONES; SUPEROXIDE dismutase
- Publication
Water, Air & Soil Pollution, 2023, Vol 234, Issue 8, p1
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-023-06574-4