Potassium - metabolism, Gills - enzymology, Sodium-Potassium-Exchanging ATPase - antagonists & inhibitors, Brain - enzymology, Gills - metabolism, Carps, Mercuric Chloride - administration & dosage, Mercuric Chloride - pharmacology, Structure-Activity Relationship, Sodium - metabolism, India, Brain - drug effects, Brain - metabolism, Dose-Response Relationsh...