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To explore the effect of CCK on food intake in Siberian sturgeon,  cck  cDNA sequence of 1005 bp was obtained, and  cck  mRNA possessed the highest expression in brain. The expressions of  cck  were significantly increased after feeding 1 and 3 h, while displaying significant decrease after fasting within 15 days in brain and duodenum. Re-feeding for 3 days induced  cck  level returned to basic level. Acute  i . p . injection experiment showed 100 and 200 ng/g BW CCK8 inhibited the food intake in 0–1 h together with the cumulative food intake within 3 h. 7 days chronic  i . p . injection of 100 and 200 ng/g BW CCK8, both daily food intake and cumulative food intake were significantly decreased. In addition, chronic  i . p  injection of CCK8 induced the expression of feeding related factors changes including  cck ,  ucn3 ,  cart ,  apelin ,  pyy  and  npy  in respective organization. Moreover, as revealed by the results, Lorglumide, the CCK1R selective antagonist, effectively reversed the inhibitory effects of CCK8 on food intake and the levels of feeding related factors. On the other hand, LY 225910, the CCK2R selective antagonist, partially reversed these effects. These results indicate CCK is a satiety factor inhibits the feeding of Siberian sturgeon primarily through CCK1R.

CCK reduces the food intake mainly through CCK1R in Siberian sturgeon (Acipenser baerii Brandt)