Ali Vaboonian; Abdolali Movahedinia; Alireza Safahieh; Saeyd A Hedayati
Volume 12, Issue 3 , September 2014, , Pages 26-32
Abstract
Different pollutants as well as heavy metals have undesirable effects on aqutic organisms and potentially may affect humans as a final consumer in food chains. Cadmium is one of the elements in most industrial effluents and so study on the effects of this dangerous element on aquatic animals is very ...
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Different pollutants as well as heavy metals have undesirable effects on aqutic organisms and potentially may affect humans as a final consumer in food chains. Cadmium is one of the elements in most industrial effluents and so study on the effects of this dangerous element on aquatic animals is very important and necessary. In this study, acute toxicity of Cadmium on the Yellowfin Seabream, Acanthopagrus latus under laboratory conditions were examined. All experiments were according the standard methods for 96 hours exposure. Concentrations of 0.1, 1, 10 and 100 mg/lit Cadmium chloride were used to determine the Range Finding Test. Therafter fish were divided into 8 groups of 12 individuals with 3 replicates (100-120 g) One group was considered as the control and other groups were exposed to 15, 25, 35, 45, 55 , 65 and 95 mg/lit Cadmium chloride respectively. Important environmental parameters such as pH, dissolved Oxygen and temprature were measured and recorded. Data were analyzed using SPSS program and Probit statistical method. According to the results, lethal concentration (LC50), maximum acceptable toxicant concentration (MATC), lowest observed effect concentration (LOEC) and no observed effect concentration (NOEC) of Cadmium chloride for Yellowfin Seabream were 34.97, 3.497, 35 and 25 mg/lit respectively.
Aliakbar Hedayati; Vahid Yavari; Abdolali Movahedinia; Hossein Pashazanosi
Volume 10, Issue 1 , September 2012, , Pages 44-52
Abstract
Successful management of sturgeon population requires knowledge of stock composition with regard to sex and gonadic stage. Measurement of sex steroid concentration has proven to be a reliable and less invasive method in compare to convention methods. In this study we have examined the possible role of ...
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Successful management of sturgeon population requires knowledge of stock composition with regard to sex and gonadic stage. Measurement of sex steroid concentration has proven to be a reliable and less invasive method in compare to convention methods. In this study we have examined the possible role of plasma testosterone (T), estradiol (E2), progesterone (P), cortisol (C) and morphometric parameters as indicators of sex and stage of gonadal development in immature (4-5 years old) Great sturgeon cultured in brackish water. Biometry of fishes, blood sampling from caudal vein was performed every three month and plasma was frozen until analyses. Glucose was measured with auto analyser, calcium and magnesium with spectrophotometer and sodium and potassium with film photometer, Hormone levels were measured by radio immunoassay (RIA). Histological preparation was stained with hematoxylin and eosin. In sex determination, result show that total length (L) and weight (W) had no significant elevation in different sexes and can not be used as an indicator sex determination. Among hormones only T had significant elevation, so it could be stated that level of T in immature Great sturgeon could be used to identify sex. In case of gonadic stage result show that total L and W just in male had significant correlation with gonadal stage and among hormones just T in male and C in female had significant correlation. So it could be concluded that in male and female respectively based on T and C measurment gonadic stage in immature Grate sturgeon could be identified