Effects Of Dietary With Different Level Of Allitridium Supplementation On The Growth, Body Composition And Disease Resistance Of Grass Carp Fingerlings (Ctenopharyngodon Idellus)

Grass carp ( Ctenopharyngodon idellus) fingerlings (average initial weight 308?2.6g) were randomly assigned to 15 ponds (20 fingerlings for each pond) and fed with basal formulated diets supplemented with 80,150,250,350mg/kg allitridium and the basal diet as control group for 48 days. Triplicate groups were made for each kind of diets. Data for weight gain, body composition and resistance to pathogenic bacteria Aeromonas hydrophila were determined and analyzed.The study showed that the relative growth rate or the specific growth rate of the tested group with 80 mg/kg of allitridium in the diet could be significantly increased by 37% and 7-13% higher than that of the control group or other groups( PO.05). Further, the dietary with allitridium supplementation of 250-350 mg/kg even resulted in negative impact on the relative growth rate but it did not show any significant difference with that of the control group( P>0.05). As to the effect of allitridium on the body composition of Grass carp, minor differences were observed among the tested groups and control group except that the fat content in muscle as well as in the whole body fed with 80 mg/kg allitridium supplementation was significantly risen by 18.4% and 9.4% respectively than that of the control group. And Further analysis showed that the drastic increase of fat content occurred in this group was due to the deposition of mesenteric fat. Similarly, proper amount of allitridium supplementation in diet ( Group 80 mg/kg and Group 150 mg/kg ) also significantly enhance their resistance to pathogenic bacteria Aeromonas hydrophila comparing with that of the control group. However, too high level of allitridium supplementation (>150mg/kg )in diets led to adverse impact on the disease resistance of Grass carpfingerlings...