Abstract: The agro-animal husbandry eco-engineering is a complex agro-ecological, economic and technological system.It is composed of three subsystems:plant (crop industry), animal (livestock industry) and microbe (linking crop and livestock industry). The key is to set up an effective and economical livestock eco-engineering system which is mainly composed of"4,3,2,1" animal production model. The objectives of this model are toproduce as many and as fine crop -livestock products as possible from as less natural resources as possible in as short periods as possible, to obtain as high economic benefits as possible, and to achieve as optimum eco-balance as possible.

Key words: Agro-animal husbandry, Eco-engineering, Ecological balance, carbon stable isotope, otolith, Schizothorax kozlovi, oxygen stable isotope