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Chemosphere. 2018 Oct;209:28-34. doi: 10.1016/j.chemosphere.2018.06.082. Epub 2018 Jun 11.

Effects of waterborne nitrite on hematological parameters and stress indicators in olive flounders, Paralichthys olivaceus, raised in bio-floc and seawater.

Author information

1
National Institute of Fisheries Science, West Sea Fisheries Research Institute, Fisheries Research & Devlopment, Taean, 32132, South Korea. Electronic address: junhwan1982@korea.kr.
2
Sun Moon University, Department of Aquatic Life and Medical Science, Asan-si, South Korea.
3
National Institute of Fisheries Science, West Sea Fisheries Research Institute, Fisheries Research & Devlopment, Taean, 32132, South Korea.

Abstract

Juvenile olive flounders, Paralichthys olivaceus (mean weight 2.69 ± 0.31 g), were raised in bio-floc and seawater for six months, these P. olivaceus (mean weight 280.1 ± 10.5 g, mean length 28.37 ± 2.3 cm) were exposed to different concentrations of waterborne nitrite (0, 25, 50, 100, and 200 mg NO2-/L) for 7 days. None of the P. olivaceus individuals exposed to bio-floc and seawater containing waterborne nitrite concentrations of 200 mg/L for 7 days survived. Hematological parameters (hemoglobin and hematocrit) were significantly reduced by nitrite exposure. Regarding plasma components, the concentrations of glucose, glutamic oxalate transaminase (GOT), and glutamic pyruvate transaminase (GPT) increased significantly in response to nitrite exposure, whereas cholesterol concentrations significantly decreased. Stress indicators, including concentrations of plasma glucose, cortisol, and liver and gill concentrations of heat shock protein 70 (HSP70) were significantly increased by nitrite exposure. The results of the study indicate that nitrite exposure affected the hematological parameters and stress indicators of P. olivaceus raised in bio-floc and seawater, and these changes were more prominent in the P. olivaceus raised in seawater than those raised in bio-floc.

KEYWORDS:

Bio-floc; Hematological parameters; Nitrite exposure; Paralichthys olivaceus; Stress indicators

[Indexed for MEDLINE]

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