Sergio Núñez

Instituto de Investigación Pesquera | INPESCA

En este Informe Final del proyecto “Evaluación del stock desovante de anchoveta y sardina común entre la Región de Valparaíso y la Región de Los Lagos, año 2020”, se presenta la totalidad de los resultados comprometidos en el estudio para cumplir con el objetivo general del proyecto de evaluar el sotck desovante de anchoveta (Engraulis ringens)y sa...

One of the main challenges in the management of small pelagic shery is the understanding of recruitment dynamics under a changing climate. This is especially important for the anchoveta shery in central-southern Chile (southern limit of its global distribution) which is highly dependent on the strength of year class. However, the drivers that modul...

Recent studies have demonstrated that current assessment practices based on spawning stock biomass to recruitment relationships do not capture important drivers of reproductive success. To understand spawner-recruit systems, we need to expand beyond traditional reproductive strategy concepts to include traits affecting reproductive success. Some of...

The jack mackerel (Trachurus murphyi) population has historically supported one of the most important fisheries in the south-eastern Pacific Ocean, with a maximun catch around five million tons in 1995. However, catches, biomass and recruitment levels have decreased steadily over the last decade to a minimum in 2008. In addition, jack mackerel disp...

Mesoscale eddies are prominent structures in the world's oceans generating a high degree of spatial and temporal heterogeneity that influences zooplankton distribution. Euphausiids (krill) are a key zooplankton group mainly inhabiting coastal upwelling areas where high productivity, advection and eddy kinetic energy (EKE) play pivotal roles in the...

El objetivo principal del proyecto que se informa es identificar la estructura poblacional del jurel (Trachurus murphyi) en el océano Pacífico sur. El estudio aplicó un enfoque metodológico multidisciplinario que incluye marcadores genéticos, parásito fauna, morfometría de otolitos, química de otolitos y aspectos oceanográficos. Su diseño considera...

The three-dimensional structure and the origin of mesoscale anticyclonic intrathermocline eddies (ITEs) in the coastal transition zone (CTZ) off central Chile (31-41°S) were analyzed through the combination of data from oceanographic cruises and satellite altimetry, and the application of an eddy-resolving primitive equation ocean model coupled wit...

Jack mackerel in the southern Pacific ocean is characterized by having a wide trophic spectrum, including planktonic and nektonic invertebrates and meso-pelagic fish, dams that form dense aggregations. This species has sustained the most important industrial fishery in Chile, where the displacement of the fishing fleet, has allowed us to analyze th...

La costa sureste del Océano Pacífico entre 37° y 41°S, se caracteriza por la presencia de un gran número de estuarios micromareales (rango mareal menor a 2 m). Uno de los estuarios más importantes dentro de estas latitudes es el estuario del río Valdivia, cuya estructura y dinámica termal y halina es poco conocida. Mediante mediciones hidrográficas...

Las fluctuaciones en abundancia, biomasa, estructura de edad y patrones de distribución de los recursos pesqueros responden, entre otros, a la variabilidad ambiental. Estas respuestas son consecuencia tanto de efectos climáticos directos sobre los recursos como indirectos actuando sobre niveles tróficos relacionados. En este estudio se revisa: i) e...

Fluctuations in abundance, biomass, age structure and distribution patterns of fisheries often respond to environmental variability. These responses are a result of both direct climatic effects on resources and indirect action on related trophic levels. In this study we review: i) the state of knowledge about the physical mechanisms associated with...

The area between 37° and 41°S of the southeastern Pacific coast, have a great number of microtidal (tidal range less than 2 m) estuaries. One of the most important estuaries in these latitudes is the Valdivia River estuary, whose thermal and haline structure is poorly known. Thus, this work, through hydrographic measurements of temperature and sali...

El objetivo General de Este Documento es determinar las unidades poblacionales de jurel (Trachurus murphyi) existentes en el Pacifico Sur y estudiar los procesos migratorios de este recurso.

In the Humboldt Current System, the region off central-southern Chile has relatively high eddy kinetic energy, generating an extensive coastal transition zone (∼600 km offshore) in which coastally derived eddies are recurrent features. This energy might promote strong exchanges of water, biogeochemical properties, and plankton between the coastal u...

We analyze sea surface temperature (SST) and chlorophyll a (Chl a) satellite data to study the seasonal variability of the upwelling off central Chile. Data from an oceanographic cruise are used to illustrate the vertical characteristics of the upwelling front and the geostrophic flow. The mean offshore extension of the SST front in summer is ˜110...

The jack mackerel population has a widespread oceanic spawning habitat off central Chile, extending more than one thousand nautical miles offshore. In this paper, the spatial structure of jack mackerel eggs density is analyzed on the basis of four surveys carried out in oceanic waters (32°S–39°S, 75°W–92°W), from 1998 to 2001. In each survey, a gri...

Chilean jack mackerel (Trachurus murphyi) is a highly migratory pelagic species that inhabits the Southern Pacific Ocean, constituting the most important fishery for Chile. This species exhibits an onshore migration during the summer related to coastal food availability, and an offshore migration towards reproductive oceanic areas (beyond Chilean E...

In this paper, the first daily egg production method (DEPM) parameters were estimated for anchovy and common sardine stocks distributed in the central-south area off Chile (33–40 • S). The study area was stratified according to the topography, shape and orientation of the coastal line, and the survey was carried out on the continental shelf during...

RESUMEN Se analizan los cambios biológicos ob-servados en las poblaciones de los peces pelágicos: sardina común (Strangomera bentincki), anchoveta (Engraulis ringens) y jurel (Trachurus symmetricus), que sostie-nen la pesquería pelágica de la zona centro-sur de Chile, en relación con la manifesta-ción del evento El Niño 1997-1998. Este evento causó...

The rich biological productivity within the Peru-Chile current system depends mainly on wind-driven coastal upwelling, which brings colder, nutrient-rich, subsurface waters into the illuminated upper layer, promoting high phytoplankton productivity whish is available for zooplankton and ultimately for fish. Off central Chile (29-39°S), where strong...

During the upwelling season along the coast off central Chile (33-40S), cold upwelled water can be easily distinguished from warm oceanic water using satellite infrared images. The boundary between cold and warm surface waters is a relatively narrow region with large horizontal gradients, denominated upwelling front, which is also clearly visible i...

Chilean jack mackerel (Trachurus murphyi) is a highly migratory pelagic species that inhabits the Southern Pacific Ocean, constituting the most important fishery for Chile. This species exhibits an onshore migration during the summer related to coastal food availability, and an offshore migration towards reproductive oceanic areas (beyond Chilean E...

The jack mackerel fishery is one of the most important resources on the South Eastern Pacific Ocean off Chile, with landings higher than 3 million tonnes between 1990 and 1996. During 1997–1998, remarkable changes occurred in the length structure of jack mackerel catches, as juveniles (<26 cm FL) dominated the fishing grounds. That was attributed t...

The sustainability of the current landing of pelagic fish in Chile (over 7 millions tons in 1994 and 1995) is analyzed using as a focus the productive capacity of the Chilean coastal upwelling ecosystem in relation to the mean annual catch of pelagic fish during the period 1989-96. The primary production required (PPR) by the main pelagic species i...

At the present time limited information is available about ecology and survival of Chilean hake larvae off coast from VIII Region, Chile. Because spatial patchiness of larvae may be an important factor on the predation of fish larvae, its influence on the instantaneous natural mortality of larval Chilean hake (Merluccius gayi gayi Guichenot, 1848)...

At the present time limited information is available about ecology and survival of Chilean hake larvae off coast from VIII Region, Chile. Because spatial patchiness of larvae may be an important factor on the predation of fish larvae, its influence on the instantaneous natural mortality of larval Chilean hake (Merluccius gayi gayi Guichenot, 1848)...

At present there is limited information available on the ecology of the hake (Merluccius gayi gayi Guichenot, 1848) in the spawning zone off central-southern Chile. The existing information indicates highly complex topography of the area (e.g. canyons and wide terraces) and oceanographic characteristics (e.g. upwelling processes and associated eddi...