Abstract: This paper comprehensively analyzes the connotation and main viewpoints of sustainable ure of natural resources, discusses the concept of functional stock and evaluation standards for sustain- able use of non-renewable resources , and proposes the notion of functional stork for selective re-source space and evaluation standards for sustalnable use of multi-resources.

Key words: GIFT strain Oreochromis niloticus, environmental factor, sex differentiation, response surface method.