Natural fish productivity is the total growth of fish obtained during one growing season at the expense of the natural food base of a pond (lake, reservoir) from a unit area, usually from 1 hectare.

Natural fish productivity depends on the natural food base of the reservoir, quality, quantity, age of fish, quality of ponds, soils, water entering the pond, on meteorological conditions of this summer, duration of vegetation period, cultural and technical level of fish breeding etc.

Fish productivity is expressed in kilograms or quintals per one hectare of water body area. The value of this indicator is not strictly constant and varies depending on soil and water quality, climatic conditions, fish species, its age, planting density, etc.