Fish Stock

A fish stock is the management unit of a fish population, a group treated as a single entity for assessment and harvest control because it shares a spawning ground, distribution, and demographic rates. A stock is not always a whole biological species or a single genetic population: managers draw boundaries that make the unit assessable and governable, which is why a unit stock is defined for management while genetic stock identification tests whether those boundaries match real reproductive isolation. Each stock gets its own assessment, reference points, and total allowable catch. Misdefined boundaries mix distinct populations and mask local depletion.