VPA [Virtual Population Analysis] estimates of the monthly population length composition, recruitment, mortality, biomass and related statistics of Peruvian anchoveta, 1953 to 1981
1987
Pauly, D. | Palomares, M.L. | Gayanilo, F.C. (International Center for Living Aquatic Resources Management, Makati, Metro Manila (Philippines) | German Agency for Technical Cooperation Ltd., Quezon City (Philippines) | Philippines Univ., Diliman, Quezon City (Philippines))
A recently developed version of length-structured Virtual Population Analysis, implemented in the form of a graphic-oriented microcomputer program (ELEFAN 3) was used to estimate, on a monthly basis, the population in number and weight by 1 cm length class of the Peruvian anchoveta (Engraulis ringens, northern/central stock). The analyses were performed with predation (by three species of guano birds, by bonito and two species of seals) accounted explicitly, and with estimates of (residual) natural mortality obtained by back calibration with independent acoustic estimates of biomass. The estimated biomass rather faithfully reflect environmental perturbation (El nino events) and human interventions (fishing and overfishing). Likely sources of errors involved in the analysis are discussed.
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