Secondary productivity is the rate of production of new biomass by consumers, i.e., the rate at which consumers convert organic material into new biomass of consumers.
•Note that secondary production simply involves the repackaging of energy previously captured by producers--no additional energy is introduced into the food chain.
•And, since there are multiple levels of consumers and no new energy is being captured and introduced into the system, the modifiers gross and net are not very appropriate and are not usually used.