Effects of subchronic exposure to simazine on zebrafish (Danio rerio).

Objectives: Simazine is a triazine herbicide which has been used for a long period in agriculture and in the aquatic environment for control of weeds and algae. The aim of this study was to investigate the effects of subchronic exposure to simazine on growth and the development of histopathological changes in selected organs (gills, kidney, liver) in Danio rerio.

Methods: Juvenile growth tests were performed on D.

Comparison of acute toxicity of ketoprofen to juvenile and embryonic stages of Danio rerio.

Objectives: Ketoprofen is a common human medicine from a class of non-steroidal anti-inflammatory drugs (NSAIDs), which is provably detected in surface waters in concentrations ordinarily in μg.L-1. The aim of this study was to compare the acute toxicity of ketoprofen to embryonic and juvenile stages of aquarium fish - zebrafish (Danio rerio).

Comparison of diazinon toxicity to embryos of Xenopus laevis and Danio rerio; degradation of diazinon in water.

The aim of this study was to determine the toxic effect of diazinon (organophosphate insecticide) to embryos of Xenopus laevis and Danio rerio. The 96-h LC₅₀ values showed higher toxicity of diazinon for X. leavis in standard solution (9.

Effect of nitrite on early-life stages of common carp (Cyprinus carpio L.).

A one-month chronic exposure of common carp larvae and embryos to nitrite revealed significant (p < 0.01) differences in total accumulated mortality in fish exposed to 33, 67, and 330 mg/L NO(2)(-) compared with controls. At the highest concentration, all fish died within 8 d of exposure.

Comparison of the sensitivity of different fish species to medical substances.

Objectives: Formaldehyde, sodium chloride and potassium permanganate belong to the commonly used substances for fish treatment. The aim is to define and compare their acute toxicity and therapeutic index between two fish species - Danio rerio and Poecilia reticulata.

Design: To determine acute toxicity of these compounds, the semistatic method was implemented in compliance with the OECD No.

Terbutryn toxicity to Danio rerio: effects of subchronic exposure on fish growth.

Objectives: The aim of this study was to investigate effects of subchronic exposure to sublethal levels of terbutryn on growth and on histopathological changes in Danio rerio.

Design: The acute toxicity tests were performed on the juvenile stage of Danio rerio according to OECD No. 203 Fish, Acute Toxicity Test.

Polyaluminium chloride (PAX-18) - acute toxicity and toxicity for early development stages of common carp (Cyprinus carpio).

Objectives: The aim of this study is to assess the toxicity of PAX-18 in different developmental stages of common carp (Cyprinus carpio). The preparation PAX-18, with its active ingredient polyaluminium chloride (9% of Al), is a coagulation agent that is used mainly to precipitate phosphates, to prevent surface water eutrophication and incidences of cyanobacteria. It is applied to the water environment and thus could present a potential risk to fish.

Leeches as Sensor-bioindicators of River Contamination by PCBs.

The aim of the study was to evaluate the use of leeches of the genus Erpobdella as a means of assessing polychlorinated biphenyl contamination of watercourses. The River Skalice, heavily contaminated with PCBs, was selected as a model. The source of contamination was a road gravel processing factory in Rožmitál pod Třemšínem from which an estimated 1 metric ton of PCBs leaked in 1986.

Comparison of acute toxicity of 2-phenoxyethanol and clove oil to juvenile and embryonic stages of Danio rerio.

Objectives: Anaesthetics are used in aquaculture to prevent stress and mechanical damage to fish during handling or the treatment of fish in breeding, blood sampling and other veterinary interventions. Clove oil and 2-phenoxyethanol are used in the Czech Republic in a water bath for the short-term immobilization of the fish.

Design: Acute toxicity tests were performed on aquarium fish Danio rerio, which is considered to be one of the model organisms most commonly used in toxicity testing.

Comparison of the sensitivity of Danio rerio and Poecilia reticulata to silver nitrate in short-term tests.

The aim of this study is to assess the acute toxicity of silver nitrate in adult zebra fish and adult guppies and to compare the sensitivity of these species to this compound. Silver is a naturally occurring element in our environment and it combines with other elements such as sulfide, chloride, and nitrate. Silver, in the form of silver nitrate, is one of the most toxic metals affecting freshwater fish.