Abstract
The rateof movement, recovery, correlations between markers and nutrients were determinedinprawn Penaeus japonicus using inert markers, chromic oxide and 5α-cholestane. The mean retentiontimes of cholestane and chromic oxide in the gastro-intestinal tract were 14.5 hand 7.2 h, respectively. This result suggested a different rate of movement of the two markers in the gastro-intestinal tract of prawns. There was a significant correlation (r=0.97) between the fecal cholestane and cholesterol contents. Cholestane also showed a high recovery and low absorption in the prawn body.These results of the present study indicated that cholestane is superior to chromic oxide as lipid digestibility marker in P. japonicus.
