stock

noun/verb

1) Verb. To add eggs, young or adults of a species to a body of water to increase the population of that species or growth rate of that or another species.
2) Noun. Group of individuals of a species which can be regarded as an entity for management or assessment purposes; a separate breeding population of a species; term used to identify a management unit of fishery species. A distinct genetic population, a population defined by movement pattern, part of a population potentially harvestable, or a quantity of fish from a given area. May be a total or a spawning stock.