Effect of ENSO on the distribution and concentration of catches and reproductive activity of anchovy Engraulis ringens in northern Chile

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dc.contributor.authorHernández Santoro, Carola
dc.contributor.authorLandaeta Díaz, Mauricio F
dc.contributor.authorCastillo Pizarro, Jorge
dc.coverage.spatialUniversidad de Valparaíso
dc.date.accessioned2026-10-27T19:00:08Z
dc.date.available2026-10-27T19:00:08Z
dc.date.issued2018
dc.description.abstractAnchovy makes up 90% of pelagic fishery catches in northern Chile. For the present work, anchovy (Engraulis ringens, Jenyns 1842) catches between 1997 and 2016 were analyzed to determine changes in distribution, concentration, and reproductive behavior before, during, and after ENSO events, using spatial indexes: gravity center (GC), inertia, coverage (CI), Gini index, and gonadosomatic index (GI). At the start of ENSO, anchovy catches increased and concentrated along the coast (rising Gini index), while CI decreased. During ENSO, Gini decreased, registering a southward displacement of the GC and smaller catches. In the long run, anchovy occupied lesser area (<CI) starting from 2008, concentrating in coastal areas. It developed a size structure composed mainly of specimens smaller than 17.0 cm. In addition, specimens < 12.0 cm were positively correlated with thermal anomalies, CI and MEI, reaching more than 60% of the catches during the 1997–1998 and 2015–2016 ENSO cycles. Results suggest that the warm phase of ENSO alters the anchovies’ reproductive activity, delaying its onset up to 4 weeks, and reducing GI intensity to 50%, due to increased participation in the reproductive process of individuals 12.0–13.5 cm. Therefore, large-scale environmental processes, such as ENSO, significantly affect size structure and contribute to reduction of occupied area and higher reproductive activity of small-size anchovies.
dc.facultadFacultad de Ciencias del Mar y Recursos Naturales
dc.identifier.urihttps://repositoriobibliotecas.uv.cl/handle/uvscl/18009
dc.language.isoen
dc.publisherFisheries Oceanography
dc.rightsAtribución-NoComercial-CompartirIgual 3.0 Chile (CC BY-NC-SA 3.0 CL)
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/3.0/cl/
dc.subjectENGRAULIS RINGENS
dc.subjectNORTHERN CHILE
dc.subjectANCHOVIES
dc.titleEffect of ENSO on the distribution and concentration of catches and reproductive activity of anchovy Engraulis ringens in northern Chile
dc.typeArticle
uv.departamentoEscuela de Biología Marina
uv.notageneralTrabajo Titulación Magíster en Oceanografía.

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