Integrated biomarker response in catfish Hypostomus ancistroides by multivariate analysis in the Pirapó River, southern Brazil.

Aquatic pollutants produce multiple consequences in organisms, populations, communities and ecosystems, affecting the function of organs, reproductive state, population size, species survival and even biodiversity. In order to monitor the health of aquatic organisms, biomarkers have been used as effective tools in environmental risk assessment. The aim of this study is to evaluate, through a multivariate and integrative analysis, the response of the native species Hypostomus ancistroides over a pollution gradient in the main water supply body of northwestern Paraná state (Brazil).

Evaluation of Biochemical, Genetic and Hematological Biomarkers in a Commercial Catfish Rhamdia quelen Exposed to Diclofenac.

Juveniles Rhamdia quelen fish species were exposed to diclofenac for 96 h at concentrations of 0.2, 2, and 20 μg/L. Biochemical, genetic, and hematological biomarkers were assessed in the liver, kidney, and blood in order to evaluate the toxic effects.

Biochemical responses in freshwater fish after exposure to water-soluble fraction of gasoline.

The water-soluble fraction of gasoline (WSFG) is a complex mixture of mono-polycyclic aromatic hydrocarbons. The study aimed to evaluate the effects of WSFG diluted 1.5% on freshwater fish.

(1→2) and (1→6)-linked β-D-galactofuranan of microalga Myrmecia biatorellae, symbiotic partner of Lobaria linita.

A structural study of the cell wall polysaccharides of Myrmecia biatorellae, the symbiotic algal partner of the lichenized fungus Lobaria linita was carried out. It produced a rhamnogalactofuranan, with a (1→6)-β-D-galactofuranose in the main-chain, substituted at O-2 by single units of β-D-Galf, α-L-Rhap or by side chains of 2-O-linked β-D-Galf units. The structure of the polysaccharide was established by chemical and NMR spectroscopic analysis, and is new among natural polysaccharides.