Baiguishan Reservoir is a multi-purpose one in the Huanhe River systems. A stocking of 210000 fertilized eggs of Neoaalanx tatbuensis Chen was reached in this reservoir in 1987. Ice fish catch totaled 190t in 1991~1993, equalling an economic value of over 5×10⁶ yuan, Neosalanx taihuensis Chen, characterized by short life cycle, short food chains, high tolerance of environmental conditions, easy catch etc., can be successfully domesticated as supplementation. On the ecosystems of Baiguishan reservoir, niches are not fully occupied with less competition of food, ice fish is suitable for domestication in this kind of water body. The reproductive biological characteristics of ice fish are quite similar Ln this reservoir to those in Taihu Lake. The food compositions are mainly copepoda and cladocera. The ice fish widely distributed in the reservoir and a heavy population is found in the densely-grown water grasses in the upper and middle reaches. In the light of estimation in 1991, the potential stock of ice fish in the whole reservoir was expected to be 108920 kg at 156 million in numbers. The biological benefits are extremely high from 1987 to 1991. About 29.5% of the biomass of zooplankton was consumed by the ice fish stocked.