INVASTIGATION OF THE INNATE RESPONSES OF THE PRE-BROODS

Objective: In fish ponds, stresses increase fish susceptibility to diseases, reduce growth and reproduction. It is believed that stress resistance can be transferred from bloodstocks to their offsprings. Method & Materials: To find the innate responses of Oncorhynchus mykiss with 364±60 gr weigh were bled from caudal vein in two stages, i.e. after inducing stress by one hour confirmation of the experimental fish and 36 hour resting after the post stress period. After labeling, the fish were kept in unstressed condition for 21 days. They were bled again in the same stages after repeating the same stress induction. The blood samples were analyzed for plasma glucose, cholesterol and total protein and compared statistically at p<0.05. Results & Conclusion: Based on the results of the experiment, fish were categorized into three categories according to the changes of plasma glucose that was seen to be reliable compare to the other two parameters. The three groups were categorized as 1) unable to set homeostasis in setting glucose (UH) (14.7% of the test fish), 2) able to set homeostasis in setting glucose (AH) (53.6% of the test fish) and 3) adapted to set homeostasis in setting glucose (DH) (31.7% of the test fish). Based on the similarity of the experimental conditions for the fish in running various stages of the test, it was suggested that a genetic factor which causes non-insulin dependent diabetes, likewise in advanced vertebrates, influences setting the fish in three categories.

کلیدواژه ها:

stress ، Oncorhynchus mykiss ، rainbow trout ، pre-broods ، cholesterol ، plasma glucose ، total protein