PILOT STUDY ON THE FECES EXCRETION OF RICEFIELD EELS-MONOPTERUS ALBUS

Abstract:The feces excretion under different patterns of food intake and effect of food consumption on fecal wastes of ricefield eels were studied indoor by feed-tagging methods.Feces excretion was completed by 5 batches for 38—134h when ricefield eels fasted for 5 days were not fed after satiation during 2 hours, and fecal wastes of every batches except the third batch were even, which covered 20.71 %—25.67% of total fecal wastes;feces excretion decreased to 2 batches for 64 —106h when ricefield eels fasted for 5 days were fed at a ration level of 0.5 %wet fish mass ;feces excretion was completed by 3 batches for 29 —92h when eels were fed once daily ;feces excretion was completed by 4 batches for 32 —90h when eels were fed once on alternate days.The proportion of fecal wastes during an hour to fecalwastes during 24 hours after water exchanging was (57.42 ±34.33)%, and fecal wastes during 15 hours after feeding were significantly higher than those from 15 to 39 hours after feeding.Water exchanging and food consumption could stimulate feces excretion significantly.There was greatly significant linear regression relation (Y =0.1502X +0.00.7)between food consumption(X)every day and fecal wastes(Y)during 15 hours after food consumption.These research results would provide theoretic basis for management of food consumption and control of water quality in the culture of ricefield eels.