Nickel Nitrate Induced Changes in Visceral Hexokinase Activity of Three Freshwater Teleosts

摘要

AbstractThe effect of lethal and sublethal concentrations of nickel nitrate on the visceral hexokinase activity inLabeo rohita(Ham.),Clarias batrachus(Linn.), andChanna punctatus(Bloch) was investigated. A maximum fall in hexokinase activity was recorded in liver followed by muscle, kidney, brain and gill at lethal and sublethal levels of nickel nitrate. Among these three fishes the variations observed inLabeo rohitaare greater than inClarias batrachusandChanna punctatus. The fall in hexokinase activity was minimum at a sublethal level and maximum at a lethal level in all the tissues of these three fish species. The fall in hexokinase activity was highest at 18 h exposure in comparison to 12 h or 8 h in these fishes. However, the differential fall in the visceral hexokinase activity may be ascribed to compartmentation of tissues, precipitation of toxicant and respiratory distress.