Respiratory Exchange in Fresh-water Fish

Respiratory Exchange in Fresh-water Fish: Part VI. On Pike (Esox lucius).

Fresh-water Fish Chemoreceptors Responsive to Dilute Solutions of Electrolytes

I N T R O D U C T I O N The palatal chemoreceptors of the carp display a rather peculiar type of response to varying concentrations of electrolytes (Konishi and Niwa, 1964). Dilute solutions of salts, especially those with polyvalent anions such as Na3citrate and Na 2 HP04 , produced strong responses. However, an increase in concentration depressed receptor activity, although the activity incre...

Toxicity of Nickel to Fresh Water Fish, Channa

Heavy metals are considered as the most important pollutants of the aquatic environment. In the present study, acute toxicity test was used for the determination of lethal toxicity of Nickel in adult fish, Channa gachua as the test organism. Toxicity test is most reliable for accessing the adverse effect of pollutants on aquatic life. The LC50 values were determined and observed that the values...

Parasitic adaptation of fresh water fish, Channa Striatus

The thorny headed acanthocephan, Pallisentis nagapurensis infects the intestine of fresh water murrel, Channa striatus. This parasite broughts severe histopathological changes in the intestine includes mucosa and submucosa are completely disrupted, thickened lamina propria, damage of epithelial cells, mucosa folds clumped. The intestinal villi of the mucosa shrinked, infected intestine often en...

Influence of Cypermethrin on DNA and RNA Content in Different Organs of Fresh Water Fish Cyprinus carpio

In this study, freshwater fish Cyprinus carpio was exposed to sub lethal concentration of synthetic pyrethroids insecticide cypermethrin to evaluate the impact on nucleic acids in different organs. Fishes were exposed to sub lethal concentration (1/10th of LC50 value) of cypermethrin for three different durations, 7, 14 and 21 days. In seven day exposed fishes, DN...