Some Biochemical Studies On The Blood Of Catfish Under Different Circumstances

In the present study two experiments were performed on 180 Clarias lazera of 200 - 250 grams body weight where 90 fish were subjected to each experiment.In the first experiment, the ninty fish were divided into 3 equal groups; the first group was considered as control and the second and third groups fish were exposed to 20 and 30 mg of ammoniallitre of aquarium water (mgllitre) respectively.In the second experiment, the other ninty fish were also dividedinto 3 groups; the first group was considered as control and thesecond and third groups were exposed to 0.09 and 0.5 mg of zinc sulphate per litre of aquarium water (mgllitre) respectively. Blood samples were collected from 10 fish in each group after 8, 16 and 24 hours from the begining of each experiment and serum w(HDL cholesterol), low density lipoprotein cholesterol (LDLcholesterol), very low density lipoprotein cholesterol (VLDLcholesterol), zinc, copper, iron and manganese levels were determinedin each serum sample. It was found that: 1- The effect of ammonia exposure on blood serum parameters inClarias lazera was as follows:Triglyceride levels showed significant decrease in fish exposed to20 and 30 mg of ammoniallitre for 24 hours.