Fresh liver slices were shock-frozen in liquid nitrogen, then carefully powdered in a suitable kitchen mixer. The moistened powder had been given to larvae, kept in buckets (600 ind/buck). Comparison for food utilization was made in the 1st experiment with sibs of silver carp bighead carp hybrids fed living zooplankton and an artificial casein-gelatin diet in freeze-fractured form. After 2 weeks, the fresh weight of the liver-fed larvae was roughly 50% higher than that of plankton fed larvae; the dry weight was the double. The growth of larvae was better with plankton during the 3rd week. Survival was very good in both groups. Larvae fed with artificial diet had poor growth and survival, probably because of leaching of hydrosoluble additives (vitamins and minerals) which have to be protected. In a 2nd experiment, larvae of koi scaly carp hybrids were fed with freeze-fractured liver as above, and compared with living Artemia nauplii for growth and food utilization. During the first 2 weeks, the weight of liver-fed larvae was about 20% of that of Artemia-fed larvae. At the end of the 3rd week, the weight of liver-fed larvae was 30% that of Artemia-fed. At the end of the 4th week, it was 50% and at the end of the 5th week it became about 70%. Survival was fair. Freeze-fractured liver seemed to be a better starter food for cyprinid larvae than living zooplankton from ponds at the time of the experiment (July-August), although not so efficient as Artemia nauplii, but its cost is cheaper. The freeze-fractured liver is probably more efficient as food for Chinese carp hybrids than for koi common carp hybrid. In the casein-gelatin artificial diet, inefficiency is probably caused by leaching of hydrosoluble additives, which have to be protected.