Metallothionein in Different Tissues of Carassius auratus Exposing to Cadmium Under Different Temperatures

This research investigated the impact of waterborne cadmium on the content of metallothionein(MT)in liver and kidney of Caras-sius auratus in experimental condition.The result indicated that there was a significant differences of the background MT value in Carassius auratus tissues(P0.01).The MT concentration in liver was higher than that of kidney.The background MT average value in liver is 3.50 μg.g-1 and 3.25 μg.g-1 respectively under water temperature was(26.5±1)℃ and(16.5±1)℃,in kidney was 3.20 μg.g-1 and 2.72 μg.g-1;The ex-pression of MT in liver and kidney reached a peak at 12 h and then differently decreased at 24 to 48 h and kept stable,and the increasing rate was the highest in 6 h.The analysis relevant indicated there was a better positive correlation between the MT contents and the concentration of Cd2+ in 12 h.The change of water temperature cannot change the expression tendency of MT in Carassius auratus tissue,but influence the expression rate and contention of MT.The MT contents and expression rates in Carassius auratus tissue increased with the increasing of tem-perature at the same content of exposing to cadmiumion.