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Volume 42 - Number 3 - 2007
Artículo


Growth and somatic production of the fan scallop (Argopecten purpuratus) in Independencia Bay, Pisco (Peru) during El Niño and La Niña events

Juan Tarazona1,2, Roberto Espinoza1, Marco Solís1 y Wolf Arntz3

 

1Grupo DePSEA Instituto Antonio Raimondi, Laboratorio de Ecología Marina, Facultad de Ciencias Biológicas, Universidad Nacional Mayor de San Marcos. Apartado 1898, Lima 100, Perú
2Red sobre Impacto Biológico de los Eventos El Niño (RIBEN), Consejo Nacional de Ciencia y Tecnología. Apartado 1984, Lima 100, Perú
3Alfred Wegener Institute for Polar and Marine Research. Am Alten Hafen 26, D-27568, Bremerhaven, Germany

 

E-mail: respinoza.unmsm@gmail.com

 

Argopecten purpuratus is the most economically important shellfish resource in the central coast of Peru. In the last years, the information about its stock, population structure and temporal changes (recruitment, reproduction, etc.) has increased. However, some aspects of its dynamics during the ENSO periods are still unknown. The present study compares various population parameters of the scallop Argopecten purpuratus between the warm El Niño 1997-98 event and the cold La Niña 1999-2000 event. During El Niño, growth rate was about three times higher than that registered during La Niña, while the population’s somatic production and the annual turnover rate (P/B) were respectively tenfold and twice higher than that observed during La Niña. These results demonstrate positive effects of El Niño on the growth and secondary production of A. purpuratus. This knowledge is an important contribution for fishery management system


Key words: Pectinidae, ENSO events, biomass, mortality, P/B rate

 

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1Laboratorio de Zooplancton, Instituto de Ciencias del Mar y Limnología,Universidad Nacional Autónoma de México. A. P. 70-305, 04510 México, D. F. México
 
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