1. The total output especially of a commodity or an industry; 2. The total living matter (biomass) produced by a stock through growth and recruitment in a given unit of time (e.g. daily, annual production). The "net production" is the net amount of living matter added to the stock during the time period, after deduction of biomass losses through mortality; 3. The total elaboration of new body substance in a stock in a unit of time, irrespective of whether or not it survives to the end of that time.