In this study, the mortality effects of commercial gasoline at different tested concentrations were evaluated on the common roach (Rutilus caspicus) and LC50 values for each time period (24, 48, 72, and 96 hours) have been determined. Roach with an average weight of 3.1 ± 0.45 g and lengths of 4 ± 0.25 cm were used in this study. After transferring the 200 fish to the laboratory, they were kept in tanks of 100 liters for one week to adapt them to the experimental conditions. After the adaptation period, 100 fish were selected randomly and divided into 14 treatments (0, 2, 5, 10, 20, 40, 60, 80, 100, 200, 400, 600, 800, and 100 ppm commercial gasoline).The treatments were completed in triplicate. The results of this study show that the 96-hour LC50 of commercial gasoline is 600.2 ± 0.44 ppm and the maximum allowable concentration (MAC) is 60.02 mg/L. The study demonstrates the deadly effects of commercial gasoline on the Caspian roach. Spillage of diesel and gasoline fuels from transport tankers can enter rivers and eventually the marine ecosystem, and reach nursery and spawning areas where it can become a serious threat to fish survival.
Pesticides and chemicals used in agriculture may finally enter aquatic environments and accumulate in the food chain and may cause serious ecological and health problems. The aim of the present study was to investigate and compare the acute toxicity of diazinon and deltamethrin as potential dangerous agricultural pesticides and to assess the mortality effects of these chemicals on tra catfish (Pangasius hypophthalmus) in the form of LC 50. Fish samples (seven fish in each test group) were exposed to different concentrations of diazinon and deltamethrin (between 0 and 40 ppm of commercial diazinon and 0 and 2 ppm of commercial deltamethrin) for 96 h in 120 L glass aquaria. Although significant difference was observed in the acute toxicity of chemicals, the very low LC 50 obtained for deltamethrin (0.10 ppm) and diazinon (11 ppm) indicates that deltamethrin and diazinon are highly toxic to P. hypophthalmus. Further studies are recommended to investigate the processes by which these chemicals affect the physiology and histology of fish and their accumulation in fish tissues. Although these chemicals are thought to be less toxic in field conditions due to their adsorption to sediments, these data are useful when assessing potential ecosystem risks.
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