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214 华 中 农 业 大 学 学 报 第 41 卷

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Accumulation and distribution of cadmium in Carassius auratus and

effect of water velocity on its scavenging

1
1
1
WEI Danqiu ,HUANG Taotao ,YIN Jiaojiao ,ZHANG Xuezhen 1,2
1.College of Fisheries，Huazhong Agricultural University/Engineering Research Center of
Green Development for Conventional Aquatic Biological Industry in the Yangtze
River Economic Belt，Ministry of Education，Wuhan 430070，China；
2.Key Laboratory of Environment Correlative Dietology，Ministry of Education，Wuhan 430070，China

Abstract In order to understand of the accumulation rule of heavy metal cadmium in fish and provide
a theoretical basis for economic，safe，and rapid solution of the problem of heavy metal enrichment in fish，
crucian carp（Carassius auratus），a commonly farmed fish in China，was used as the test object.After deter⁃
mining the safe concentration of cadmium in crucian carp，crucian carp were exposed to water containing dif⁃
ferent concentrations of cadmium for 14 days.The accumulation and distribution of cadmium in various fish
tissues were detected by using an inductively coupled plasma mass spectrometer.Then the crucian carp was
transferred to clear water at different flow rates for 14 d.The effect of different water flow rates on cadmium
removal from fish was compared，and the non-carcinogenic dietary risk of crucian carp edible parts was as⁃
sessed after exposure test and clearance test，respectively.The results showed that the safe mass concentra⁃
tion of cadmium in crucian carp for 96 h was 1.528 mg/L.Cadmium was more enriched in the crucian carp
head and liver，but less enriched in the muscle，and cadmium enrichment degree was positively correlated
with cadmium concentration in aquatic environment and cadmium exposure time.Cadmium in the crucian
carp muscles and gallbladder was excreted faster，while cadmium in the liver and kidneys was excreted slow⁃
er，and the clearance effect was the best when the water flow rate was 0.1 to 0.2 m/s.After exposure to cad⁃
mium in water for 14 days of ，the crucian carp head and muscle had the potential risk of non-carcinogenic.
After cadmium removal from water for 14 days of，the muscle could reach the edible standard，but the fish
head still had the risk of food.In summary，there are significant differences in the accumulation and capacity
ability of cadmium in various tissues and organs of crucian carp.Appropriate water flow rate is conducive to
the discharge of cadmium in crucian carp，and the cadmium-contaminated crucian carp need to be removed
from heavy metals before it can be eaten.
Keywords crucian carp；cadmium；accumulation；depuration；water velocity；risk of consumption

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