Analyses of the composite yield per recruit model CYPR14 for inferring plausible fishing mortality targets of fish in the tropics

Stocks' yield and size per recruit are widely used to provide fisheries management guidance. This study provides details for analyzing the composite (i.e. age-aggregated or stage-structured) (CYPR) model CYPR14, proposes CYPR14 as a tool tropical fisheries. The fishing mortality rates maximizing CYPR ( F ) associated with marginal increase in 0.1 target spawning potential ratio (CSPR; 35%CSPR 40%CSPR were suggested candidate targets, provided assessments employ delay-differential underlying CYPR14. Using Monte Carlo (MC) simulations relying on growth parameters natural of Lake Tanganyika's Lates stappersii Victoria's niloticus , analyses involving maximum survivorship declining carried out show how could be generated, given an age knife-edge recruitment r ). Baseline MC employed = 1 year yielded mean annual 0.52, 0.33, 0.51 L. 0.23, 0.14, 0.16 . produced isopleths such that maximized at infinite finite, higher For survivorship, declined increased innermost closed-loop contours lower optimal age. CSPR from both types first concave down, served their inflection point. In terms benchmarks based sustainable proxies thereof, should its what age-structured pool models assessment models.