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Copper sulfate acute ecotoxicity and environmental risk for tropical fish Biological Sciences
Silva, Adilson Ferreira da; Cruz, Claudinei da; Rezende, Flavia Regina Lazaro de; Yamauchi, Alfredo Kohiti Feres; Pitelli, Robinson Antonio.
The aim of this study was to estimate copper sulfate acute toxicity and to determine death percentage and environmental risk on guppy fish (Phallocerus caudimaculatus), zebrafish (Brachydanio rerio), mato grosso (Hyphessobrycon eques), and pacu (Piaractus mesopotamicus). Fish were exposed to 0.01, 0.03, 0.05, 0.07, 0.10, and 0.30 mg L-1 (guppy), 0.05, 0.07, 0.10, and 0.30 mg L-1 (zebrafish), 0.07, 0.10, 0.20, and 0.30 mg L-1 (mato grosso) and 9.5, 10.0, 10.5, 11.0, 11.5, and 12.0 mg L-1 (pacu) of copper sulfate, with triplicate control. The estimated 50% average lethal concentrations (LC50; 96 hours) were 0.05 (guppy), 0.13 (zebrafish); 0.16 (mato grosso) and 10.36 mg L-1 (pacu). Copper sulfate was extremely toxic for guppy, highly toxic for zebrafish and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: 2.00.00.00-6 - Ciências Biológicas bioindicators; Algaecide; Toxicity 2.05.03.00-8.
Ano: 2014 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/18373
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Algicidal effects of aqueous leaf extracts of neem (Azadirachta indica) on Scenedesmus quadricauda (Turp.) de Brébission Acta Botanica
Chia,Mathias Ahii; Akinsanmi,Jamiu Taiwo; Tanimu,Yahuza; Ladan,Zakari.
The application of synthetic algaecides for the control of algae produces by-products that are sometimes toxic to the environment. There is a need for natural and cheap alternatives to synthetic algaecides. In the present study, we investigated the potential of aqueous crude extract of Azadirachta indica to inhibit the growth of Scenedesmus quadricauda. Phytochemical screening of the extract revealed the presence of groups of bioactive compounds that are capable of inhibiting microalgal growth. Chlorophyll a concentration, dry weight production and cell density of microalga decreased with increasing crude extract concentration. After three days of exposure, the 1000 mg/L extract concentration resulted in complete growth inhibition and cell lysis....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Algaecide; Growth inhibition; Microalgae; Neem; Oxidative stress; Phenotypic plasticity.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000100001
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