Acta Univ. Agric. Silvic. Mendelianae Brun. 2016, 64(1), 129-134 | DOI: 10.11118/actaun201664010129

Guanicid and PHMG Toxicity Tests on Aquatic Organisms

Eva Poštulková, Radovan Kopp
Department of Zoology, Fisheries, Hydrobiology and Apiculture, Faculty of AgriSciences, Mendel University in Brno, Zemědělská 1, 613 00 Brno, Czech Republic

The emergence and development of new algicidal products is caused by the ever increasing popularity of garden ponds as well as the use of these products in the fisheries sector, especially for disposal of cyanobacteria and algae. Most frequent means of combating cyanobacteria and algae are applications of algicidal substances. Newly developed algaecides include Guanicid and polyhexamethylene guanidine hydrochloride (PHMG). The aim of the study was to identify toxic effects of Guanicid and PHMG on zebrafish (Danio rerio) and green algae (Desmodesmus communis). We determined the acute toxicity in fish according to ČSN EN ISO 7346-1, and conducted the freshwater algae growth inhibition test according to ČSN ISO 8692 methodology. For inhibition tests with green algae we chose Guanicid and PHMG concentrations of 0.001, 0.005, and 0.010 ml/L. For fish short-term acute toxicity tests we chose Guanicid concentrations of 0.010, 0.050, 0.150, 0.200, 0.250, and 0.300 ml/L and PHMG concentrations of 0.010, 0.025, 0.050, 0.075, 0.100, and 0.125 ml/L. In case of zebrafish (Danio rerio), the LC50 value for Guanicid is 0.086 ml/L, while the LC50 value for PHMG is 0.043 ml/L. Effects of Guanicid on inhibition of green algae (Desmodesmus communis) appear highly significant (p < 0.010) at a concentration of 0.010 ml/L. For PHMG, these effects are highly significant (p < 0.001) at concentrations of 0.005 and 0.010 ml/L in 48 hours.

Keywords: algaecide, concentration, Desmodesmus communis, green algae, LC50, toxicology test, zebrafish (Danio rerio)
Grants and funding:

This study was supported by the project No. IP 6/2014 of the Internal Grant Agency of the Faculty of Agronomy of MENDELU in Brno, and the grant project NAZV (QJ1210013).

Prepublished online: February 29, 2016; Published: April 1, 2016  Show citation

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Poštulková, E., & Kopp, R. (2016). Guanicid and PHMG Toxicity Tests on Aquatic Organisms. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 64(1), 129-134. doi: 10.11118/actaun201664010129
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