Abstract
Background and objective
Spills of heavy oil (HO) over the oceans have been proven to have an adverse effect on marine life. It has been hypothesized that exposure of early larvae of sinking eggs to HO leads largely to normal morphology, whereas abnormal organization of the developing neural scaffold is likely to be found. HO-induced disruption of the nervous system, which controls animal behavior, may in turn cause abnormalities in the swimming behavior of hatched larvae. To clarify the toxicological effects of HO, we performed exposure experiments and morphological and behavioral analyses in pufferfish (Takifugu rubripes) larvae.
Experimental procedure
Fertilized eggs of pufferfish were exposed to 50 mg/L of HO for 8 days and transferred to fresh seawater before hatching. The hatched larvae were observed for their swimming behavior, morphological appearance, and construction of muscles and nervous system.
Results and discussion
In HO-exposed larvae, we did not detect any anomaly of body morphology. However, they showed an abnormal swimming pattern and disorganized midbrain, a higher center controlling movement. Our results suggest that HO-exposed fishes suffer developmental disorder of the brain that triggers an abnormal swimming behavior and that HO may be selectively toxic to the brain and cause physical disability throughout the life span of these fishes.
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Abbreviations
- HO:
-
Heavy oil
- n hpf:
-
n hours post-fertilization
- n dph:
-
n days post-hatching
- PFA:
-
Paraformaldehyde
- PBS:
-
Phosphate-buffered saline
- OT:
-
Optic tectum
- MHB:
-
Midbrain–hindbrain boundary
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Acknowledgments
We gratefully thank Dr. A. Subramanian for critical reading of the manuscript. We also thank Ms. Midori Iida for her comments on the manuscript. This research was supported by the “Global Center of Excellence (G-COE) Program” from the Ministry of Education, Culture, Sports, Science and Technology, Japan and the Japan Society for the Promotion of Science (JSPS).
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Responsible editor: Philippe Garrigues
Masahumi Kawaguchi and Yuki Sugahara equally contributed to this work.
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Kawaguchi, M., Sugahara, Y., Watanabe, T. et al. Nervous system disruption and concomitant behavioral abnormality in early hatched pufferfish larvae exposed to heavy oil. Environ Sci Pollut Res 19, 2488–2497 (2012). https://doi.org/10.1007/s11356-012-0833-0
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DOI: https://doi.org/10.1007/s11356-012-0833-0