Effect Of Dite Supplemented With Photosynthetic Bacteria On Growth Performance, Serum Indexes Of Liver And Parts Of The Nutritional Evaluation Of Protein In Trachinotus Ovatus

In this reserach, we studied the effect of different dietary compound preparation gradient of photosynthetic bacteria on growth, liver and serum indicators of Trachinotus ovatus. The basic nutrient composition in the different tissues of T. ovatus (back muscles, abdominal muscles, head, skin and visceral) was also determined. The results were as follows:1. Different gradients of photosynthetic bacteria compound preparation was adding to the feed T. ovatus,0.0%,1.0%,2.0%and3.0%respectively, to observe the effect of photosynthetic bacteria on growth, liver and serum indicators of T. ovatus. The results showed that FBW, WGR, SGR increased firstly, and then decreased with dietary levels of photosynthetic bacteria presentation increasing; when it was2%, FBW, WGR, SGR were significantly higher than that of the control group and3%(P<0.05); ratio of liver weight and body weight (HSI) showed no significant difference between groups (P>0.05); with the increase of photosynthetic bacteria levels, fat content and serum alanine aminotransferase and aspartate aminotransferase activity increased firstly and decreased afterwards in T. ovatus; when it was2%, fat content in liver of T. ovatus, serum aspartate aminotransferase and alanine aminotransferase activity were significantly lower than the others (P<0.05). adding the right amount of photosynthetic bacteria compound preparatio into the feed could promote the growth of T. ovatus and reduce the incidence of fatty liver. It showed the most significant effect at the level of2%.2. The basic nutrient composition in the different tissues of T. ovatus (back muscles, abdominal muscles, head, skin and visceral) was determined and the nutritional value of their protein was evaluated. The results showed that T. ovatus was rich in peotein which ranged18%to21%; moderate fat content was between7%and19%; amino acid content was between18%and23%, the content of essential amino acids accounted for total amino acids were all above43%, the ratio of BCAA/AAA in the different tissues of cobia ranged from2.3to2.4, which was close to the body’s normal level and helpful to protect human liver. The protein nutritional value of back muscles, abdominal muscles and head were higher than skin and visceral. Therefore, muscle protein of T. ovatus was a senior nutrition and health food.