Freshwater fish, Channa punctatus was exposed to sublethal concentration of a chloroacetanilide herbicide alachlor technical grade and lasso 50% EC for a period of 10 days. The histopathological changes in the gill include: necrosis, vacuolar degeneration, fusion and atrophy of primary and secondary gill lamellae. The tissue damages like degeneration of cytoplasm in hepatocytes, atrophy formati...

Nucleotide sequences of a partial cytochrome c oxidase subunit I gene were used to assess the manner in which historical processes and geomorphological effects may have influenced genetic structuring and phylogeographic patterns in Channa striata. Assaying was based on individuals from twelve populations in four river systems, which were separated into two regions, the eastern and western, of t...

Climate changes within Cenozoic extreme climate events such as the Paleocene-Eocene Thermal Maximum and the First Oligocene Glacial provide good opportunities to estimate the global climate trends in our present and future life. However, quantitative paleotemperatures data for Cenozoic climatic reconstruction are still lacking, hindering a better understanding of the past and future climate con...

Effect of Chlorpyrifos (Dursban) an organophosphate insecticide on the glycogen, cholesterol, protein, alkaline phosphatase and acid phosphatase in liver in Channa punctatus (Bloch) exhibited notable alterations. Liver being the main site of metabolic activity in body and highly active in both toxifying and detoxifying insecticides, was selected for the study purpose. Chlorpyrifos insecticide c...

The presence of insecticide in the environment, due to extensive use in agriculture is of potential toxicological concern for fish. Histotoxicological studies have been widely used as biomarkes in the evaluation of the health of fish exposed to the pesticides studies. In the present study the hazardous effect of the organophosphate insecticide, Fenitrothion on the histology of the fresh water f...

The toxicity studies were conducted on the fish Channa punctata (Bloch) by employing static and continuous flow through systems, for the toxicant butachlor (technical grade+) and its commercial formulation+ (machete 50% EC). The LC50 values are 297.89 ppb and 247.46 ppb for 24 hr and 48 hr in static for technical and 636.45 and 546.09 for machete. In continuous flow through the values are 270.0...

Human activities can create noise pollution and there is increasing international concern about how this may impact wildlife. There is evidence that anthropogenic noise may have detrimental effects on behaviour and physiology in many species but there are few examples of experiments showing how fitness may be directly affected. Here we use a split-brood, counterbalanced, field experiment to inv...

A population of Channa argus (Northern Snakehead) has been established in the Potomac River catchment, VA and MD, for approximately ten years, and is increasing rapidly in abundance. Little is known about life-history strategies of this species in North American environments. We report the fi rst discovery of a Northern Snakehead nest in North America and discuss some of its nesting habits. Adu...