YPR (Yield per Recruit)

Yield per recruit estimates the lifetime catch weight obtained from each fish entering a fishery, balancing growth against losses to natural and fishing mortality. The Beverton-Holt YPR model finds the fishing mortality and age at first capture that maximize yield without needing a stock-recruit relationship, which makes it useful for data-limited stocks. Growth overfishing occurs when fish are caught before reaching the size that maximizes YPR, the classic argument behind minimum landing sizes and mesh-size rules.