冷冻对轮虫休眠卵上浮率的影响

EFFECT OF FREEZING ON FLOATATION RATE OF RESTING EGGS OF ROTIFERS IN THE WATER

本文报道了冷冻对轮虫休眠卵在水中上浮率的影响。一次冷冻（２４小时）可使各种轮虫休眠卵在水中的上浮率平均提高近５０％，使晶囊轮虫休眠卵的上浮率提高９０％左右。多次反复冷冻能使各种轮虫体眠卵的上浮率提高８５％左右。冷冻时间在８～１０４小时间，延长冷冻时间不会影响轮虫休眠卵的上浮率，并分析了冷冻处理后的休眠卵在水中和糖盐高渗液中上浮率提高的机理，讨论了冷冻处理在轮虫休眠卵浮选，定量以及土池轮虫生产中的意义。

The effect of freezing on floatation rate of resting eggs of rotifers in the waterwas studied.The floatation rate of the resting eggs of rotifers by once freezing for 2 4 hrs inthe water can be increased by nearly 5 0%,but that of Asplanchna is by about 9 0%。 Thefloatation rate of the resting eggs of rotifers by freezing for many times in the water can be in-creased by about 85%。The floatation rate of resting eggs of rotifers was not affected by freezing over 8─ 104h。This paper deals with the mechanism of raising floatation rate of the resting eggs of ro-tifers after freezing treatments in the water and high permeable solution of sugar-salt and thesignificance of freezing treatments in the floating selection,quantification and production of ro-tifers in ponds。