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Toxicity of Copper and Mercury to Caspian Roach Rutilus rutilus caspicus
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| Seyyed Morteza Hoseini, Ali Jafar Nodeh |
| Gorgan University of Agricultural Sciences and Natural Resources , seyyedmorteza.hoseini@gmail.com |
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Abstract: (31257 Views) |
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Copper (Cu) and mercury (Hg) enter aquatic ecosystems from different sources threatening health of
aquatic organisms such as fish. As such, in this investigation, determinaing, Cu and Hg toxic
concentration in Caspian roach (Rutilus rutilus caspicus), was undertaken. Acute toxicity of Cu and Hg
were determined in fish specimen under semi-static condition. Caspian roach fry (~ 1 g) were exposed
to Cu or Hg at 6 concentrations (0.2, 0.27, 0.39, 0.47, 0.59 and 0.66 mg L-1 total Cu and 0.22, 0.26, 0.3,
0.37, 0.44 and 0.52 mg L-1 Hg). Control fish were exposed to water with no Cu or Hg. Mortality was
recorded at 24-h-intervals for 96 h. Total Cu-LC50 values found to be 0.43 mg L-1 for 24 and 48 h and
0.42 mg L-1 for 72 and 96 h. The lowest observed effect concentration (LOEC) values for total Cu were
0.39 mg L-1 for 24 and 48 h, and 0.20 mg L-1 for 72 and 96 h. On the other hand, free-Cu-LC50 values
found to be 0.22 mg L-1 for 24 and 48 h and 0.21 mg L-1 for 72 and 96 h. LOEC values for free Cu were
0.20 mg L-1 for 24 and 48 h, and 0.10 mg L-1 for 72 and 96 h. 24-72 h LC50 values for Hg were 0.37 mg
L-1, while 96 h LC50 found to be 0.33 mg L-1. Likewise, LOEC values for Hg were 0.26 mg L-1 for 24-
72 h, and 0.22 mg L-1 for 96 h. The results showed LOEC values for Cu and Hg in Caspian roach were
lower than these metal concentrations in Caspian Sea water, suggesting little risk of acute toxicity in the
sea. Chronic toxicity test is suggested to illustrate the effect of current levels of contamination in
Caspian roach.
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| Keywords: Copper, Mercury, Caspian roach, Toxicity |
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Full-Text [PDF 113 kb]
(4898 Downloads)
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Type of Study: Basic and Original Research |
Subject:
Marine Biology & Biotechnology
Received: 2012/12/25 | Accepted: 2013/07/23 | ePublished: 2013/07/23
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