Abstract
The acute toxicity of Zn on Java medaka (Oryzias javanicus) fish was studied. To obtain the results, the experiments were carried out in 3-liter aquariums (15 to 20 fish for each aquarium) with static condition based on O.E.C.D method with 5 treatments, and 1 blank in two repetitions. During the experiment, water physico-chemical factors were pH = 7.7 to 7.9, salinity = 19.3 to 19.7 p.p.t, temperature = 29.1 to 30.8°C and conductivity = 13.54 to 13.94 ms. On the basis of obtained results, the LC50-96 h for Zn were determined at 9.75 (9.65 - 9.85) mg/l for juveniles and 14.32 (13.94 - 14.70) mg/l for adults, respectively. Also, the maximum allowable concentration (MAC) values for Zn on Oryzias javanicus juveniles and adults were determined at 0.97 mg/l for juveniles and 1.43 mg/l for adults. These results will be helpful for future ecotoxicology study based on heavy metals pollution in estuary areas. Key words: Ecotoxicology, Oryzias javanicus, maximum allowable concentration (MAC), juveniles, adults.
Highlights
Ecotoxicology deals with adverse effects of toxicants on the ecosystems using two different approaches: acute and chronic toxicity testing
Environment pollution is a common issue in the world; it is especially important as part of this pollution depended on heavy metals
We showed that different concentrations of Zinc exhibited varying degrees of toxicity by using Java Medaka fish and two ages of fish, including juvenile and adult mortality
Summary
Ecotoxicology deals with adverse effects of toxicants on the ecosystems using two different approaches: acute and chronic toxicity testing. An acute toxicity test determines the concentration of pollutants, which has detrimental effects (change in behavior, death, etc.), on a group of test organisms during a short-term exposure. According to Chen et al (2005), even though some metals are essential when taken up by organisms, their excessive presence will reverse the effect and they become toxic and harmful. Using fish as a biologic bioindicator for pollution monitoring in the aquatic ecosystems is an approach that has been accepted and is gaining both popularity and credibility (Alam and Maughan, 1995). In the bigger picture, monitoring the marine environment is about studying the health of the ecosystem and understanding the dangers it is facing from pollution and from the presence of heavy metals among other pollutants. It is essential to fish, high concentrations may be toxic
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