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The “Argentine silverside” Odontesthes bonariensis is a species of importance for food security and local economy in several regions of the Peruvian highlands. It is a species that is subject to fishing exploitation in the Pacucha lagoon, located in the Apurímac region. Given the value that it has as a resource, the objective of the research was to study the reproductive biology of the argentine silverside in the Pacucha lagoon. The analyzes were carried out from monthly observations (fifteen months) on pejerrey specimens obtained by exploratory catches and commercial fishing. The captured specimens were subjected to biometric and biological sampling in order to obtain data to determine the reproductive characteristics, including the size at first maturity. Taking into account that the females present considerable reproductive activity between the months of August and October, the information from that period was considered to estimate the size at first maturity. According to the results obtained, males reach first maturity at 18.8 cm TL and females at 20.8 cm TL, values lower than the minimum catch size established for the resource in the Apurimac region.

Talla de primera madurez del pejerrey argentino (Odontesthes bonariensis) en la laguna de Pacucha, Apurímac – Perú