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An histological study on mercury-induced gonadal impairment in Javanese medaka (Oryzias javanicus)

Abdul Aziz, Fatin Zahidah and Zulkifli, Syaizwan Zahmir and Mohamat Yusuff, Ferdius @ Ferdaus and Azmai, Mohammad Noor Amal and Ismail, Ahmad (2017) An histological study on mercury-induced gonadal impairment in Javanese medaka (Oryzias javanicus). Turkish Journal of Fisheries and Aquatic Sciences, 17 (3). pp. 621-627. ISSN 1303-2712; ESSN: 2149-181X

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Mercury (Hg) is highly toxic and potent neurotoxin. Bioaccumulation of mercury in a new model fish species, Javanese medaka (Oryzias javanicus) under sublethal levels and effects of mercury exposure on gonads via histological studies were investigated in this study. A total of 150 adults of O. javanicus were exposed to mercury at five different concentrations; 0, 10, 20, 30, 40 ppb for 14 days. High accumulation of mercury were observed at the Mercury exposures of 30 ppb (3.17 mg/kg) and 40 ppb (2.92 mg/kg). Meanwhile, no significant difference was detected with 0 ppb (0.72 mg/kg) and 10 ppb (0.74 mg/kg) exposure. The accumulation increased by the increment of the concentrations of mercury exposure. Histological study revealed the increasing amount of oocyte atresia and decrease in vitellogenesis with high mercury exposure. Severity grading and degrading of ovaries were depicted at 30 and 40 ppb exposure, respectively. Testicular tissues showed severe effects, which resulted from exposure to various mercury concentrations. Complete disorganisation in cyst arrangement and decrease of progressive stages of spermatogenesis were observed in the morphology of exposed O. javanicus testis. The present study’s finding suggested mercury potential for bioaccumulation and its effects on the morphology of gonad in O. javanicus.

Item Type:Article
Keyword:Mercury; O. javanicus; Bioaccumulation; Gonad; Histology
Faculty or Institute:Faculty of Environmental Studies
Faculty of Science
Publisher:Central Fisheries Research Institute, Trabzon, Turkey in cooperation with Japan International Cooperation Agency, Japan
DOI Number:10.4194/1303-2712-v17_3_18
ID Code:56245
Deposited By: Nabilah Mustapa
Deposited On:04 Jul 2017 11:03
Last Modified:04 Jul 2017 11:03

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