The former applies to a stock whose biomass (number of fish) falls below biologically safe limits or for which catches are so high that the stock cannot replenish itself.
Úsáidtear an chéad téarma acu seo do stoc mar a bhfuil líon na n-iasc (an bhithmhais) faoi bhun theorainneacha na slándála bitheolaí, nó mar a ndéantar iascach ar an iomarca acu le gur féidir a athshaothrú a cheadú.