Abstract:

In 2009,at 13.08℃ of water temperature the oxygen consumption rate and asphyxian point for two sizes of the white spotted char（Salvelinus Leucomaenis f.pluvius ）were determined during the daytime and nighttime from 6:00 to 5:00 of the next day in Bo hai Cold water Fish Experimental Station of Heilongjiang River Fishery Research Institute. The results showed that the oxygen consumption rate and asphyxian point would be decreasing along with the increasing of the bodyweight of the white spotted char, but oxygen uptake would be increasing with the increasing of bodyweight. There were no significantly difference for the oxygen consumption rate at the same size in day and night , merely the mean oxygen consumption rate in the night time was higher that the daytime’s. At the water temperature of 13.08℃，and the 2.06g bodyweight of white spotted char, oxygen consumption rate, mean oxygen uptake and asphyxian point was 6.14mg／g?h，13.58mg／indi.?h and1.28mg／L respectively , also in the same water temperature, the 85.95g bodyweight of white spotted char, oxygen consumption rate, mean oxygen uptake and asphyxian point was 0.46mg／g?h，39.69mg／indi.?h and0.96mg／L respectively. Based on the above results, we fixed the optimal feeding time for white spotted char at 9:00, 12:00 and 18:00 in the whole day, moreover at 12:00, the feeding amount accounted for 3/5 as the total amount.