Effects Of Starvation And Re-feeding On Biochemical And Body Parameters In Grunt Plectorhynchus Cinctus

The compensatory growth of juvenile grunt (Plectorhinchus cinctus Temmincket et Schlegel) (initial body weight=338.1±36.2g), after 28 days of feed deprivation, was studied, during September 2003 and December 2003, at Nan'ao Marine Biology Station of Shantou University. Water temperature was 22.0℃-26.5℃ during the experimental period. The satiation group was fed to satiation during the 56-day experimental period .The starvation group were deprived from feed during the early 28-day experiment and then were fed to satiation during the later 28-day experiment. The results about body index parameters and the main biochemical parameter of liver, white muscle and blood plasma from six fish which were sampled every time on 0, 7th, 14th and 28th day during the period of starvation, and on 7th, 14th and 28th day during the re-feeding period were as follows:Except entire length, the other body index parameters like hepatosomatic index, SGR, body weight, condition factor and body length in Plectiyhynchus cinctus were all decreased and had significant differences on 7th, 14th, 14th, 14th or 28th day during feed-deprivation period, and hepatosomatic index and SGR had significantly higher differences. After re-feeding, all body parameters in starved group were recovered gradually but not to the levels of satiation group, especially body weight had significant differences.During the period of starvation, the contents of glycogen, total lipids in liver and white muscle and total protein in white muscle were significantly decreased after 7 or 14 or 28 days, while the water content in white muscle and liver, the total protein content in liver were increased after 14 or 28 days. The results suggested that P. cinctus could utilize glycogen firstly, then lipid, at last protein as the main source of energy in feed deprived period. The substances used in the muscle were preferential to those in the liver. The contents of glycogen, total lipid, total protein in liver and glycogen in muscle, the contents of total lipid, total protein in muscle and water in liver, the content of water in muscle were recovered to the level of satiation groupafter 7.14 and 28 days during re-feeding period.During the period of starvation, the contents of plasma glucose, cholesterol and protein in plasma were all significantly lower than those in the satiation group after 7. Hand 28 days. After re-feeding, the contents of glycogen, lipid and protein in plasma were a little lower than those in the satiation group after 28, 28and 14 days.These results indicate that the recovery growth of P. cinctus showed limited compensatory growth during re-feeding for 28 days, following 28 days of feed deprivation. We suggest it is good for culturing grunt avoiding starvation or shortage of feed...