镇赉高产塘的底栖动物及其利用率

自１９８８年至１９９０年，在吉林省镇赉渔场高产地中，先后应用了定性、定量采集，地底铺网、昆虫挂网等手段，得出在集约化养鲤池中，鲤对水蚯蚓的利用率为现存量的４８％至７３．７％，平均约６１％左右。摇蚊科幼虫的区系季节变化，一年中有两个高峰期，其羽化率为现存量的２８．９７％至４７．５７％，平均４１．６％左右。鲤对摇蚊科幼虫的利用率为现存量的３５％到６７％，平均５０％左右。

The Benthos and Its Utilized Rate in the Fish Ponds

The benthos from the fish ponds at Zhen Lai in Ji Lin were studied from 1988 to 1990 by the means of modified Peterson grab,emergence traps and bottom nets,The specimens were extracted and identified.The prey rates of wa-ter worms by common carp were 48.0-73.7%, with a mean of 61%in the in-tensive common carp-raised ponds.The numbers of population of Chironmidae varied with two peaks in annual fluctuation.The hatch abilities of Chironomidae were 28. 97-47. 57%in cohirt, with a mean of 41. 6 percent. Utilized rates of larva of Chironomidae were from 35%to 67%,with a mean of 50%in biomass by the carp.