Claudio Silva

Pontificia Universidad Católica de Valparaíso | PUCV · School of Ocean Sciences

The distribution of eggs, landing, fishing effort and CPUE abundance index, and sea surface temperature, chlorophyll concentration, winds and sea height are analyzed. The description of the essential habitat is based on bibliographic references along with fisheries and satellite information, generating information matrices with suitability ranges....

The possible effects of climate change on Chilean marine ecosystems are considered. Relationships between the abundance of exploited species, fishing effort and environmental variables are elucidated, and conceptual models for an ecosystemic management of fisheries are proposed. A projection for anchovy fisheries in northern Chile is carried out, c...

In a changing climate, there is an imperative to build coupled social-ecological systems—including fisheries—that can withstand or adapt to climate stressors. Although resilience theory identifies system attributes that supposedly confer resilience, these attributes have rarely been clearly defined, mechanistically explained, nor tested and applied...

In a changing climate, there is an imperative to build coupled social-ecological systems-including fisheries-that can withstand or adapt to climate stressors. Although resilience theory identifies system attributes that supposedly confer resilience , these attributes have rarely been clearly defined, mechanistically explained, nor tested and applie...

RESUMEN. Se analiza la pesquería de jurel realizada por 16 países en el Pacífico Sur Oriental (PSO), con modelos globales de producción (que consideran la variabilidad ambiental) y datos del período 1973-2020. Se considera la hipótesis de una unidad de stock y se toman en cuenta: 1) la captura (C) de los países que explotan el recurso en el PSO; 2)...

Capturas totales permisibles de jurel (Trachurus murphyi) en el Pacífico Sur Oriental se analizan nuevamente para la pesquería de jurel desarrollada en el Pacífico Sur Oriental (PSO), considerando la hipótesis de una sola unidad de stock. Para tal efecto se toman en cuenta, del período 1983-2019: la captura (C) de los países que explotan el recurso...

"Is a project about climate change and impacts on Chilean pelagic fisheries"

Únicamente tenemos un solo océano, cubre el 72 % de la superficie terrestre y es esencial para la humanidad. El océano ha permitido que la Tierra sea un planeta habitable y los beneficios que nos brinda en nuestro día a día son numerosos. Sin duda, su rol en el ámbito socioeconómico, climático y ambiental, incluso en zonas alejadas del mar, lo hace...

An assessment of climate change impacts on the habitat suitability of fish species is an important tool to improve the understanding and decision-making needed to reduce potential climate change effects based on the observed relationships of biological responses and environmental conditions. In this study, we use historical (2010-2015) environmenta...

Artificial Neural Networks (ANN) are adjusted to predict monthly landings of anchovy (Engraulis ringens) and sardine (Sardinops sagax) in northern Chile (18°21'-24°00'S). Fishing effort (FE), landings and twelve environmental variables are considered from 1980 to 2012. External validation for the best models using all variables showed an R 2 of 95%...

The Chilean government is developing a comprehensive climate change policy for fisheries and aquaculture, including institutional, research and capacity building, to reduce vulnerability and improve adaptation in order to make this ecosystem services more resilient to future changes. This is illustrated by several case studies. The occurrence of co...

Artificial neural networks (ANNs) were used to predict landings of anchovy (Engraulis ringens), common sardine (Strangomera bentincki), and jack mackerel (Trachurus murphyi) in central-southern Chile. Twelve environmental variables were considered along with fishing effort (fe) and landing statistics from 1973 to 2012. During external validation, t...

The effects of climate change on ocean conditions will have impacts on fish stocks, primarily through physiological and behavioural effects, such as changes in growth, reproduction, mortality and distribution. Habitat and distribution predictions for marine fishery species under climate change scenarios are important for understanding the overall i...

In this study, an integrative weight of evidence (WOE) tetrad methodology was developed and used to assess environmental quality and ecological risk at contaminated sites by fish farm effluents using spatial modelling tools [geographical information systems (GIS) and fuzzy logic and multicriteria analysis (MCA)], taking into account the results of...

Epipelagic medusae collected in the Magellan Region (Southern Patagonian Zone) during spring 2009 were analyzed. A total of 27 species of medusae were identified (25 hydromedusae and 2 scyphomedusae). Twelve medusae species were recorded for the first time in the Magellan region. Six dominant species were found: Clytia simplex (19.8%), Rhopalonema...

Based on a review of published and unpublished reports we analyzed Rapa Nui's (Easter Island) traditional and artisan fisheries. We include information from 2000-2009 on landings, species, fishing grounds, fleet and number of fisherfolks according to the Servicio Nacional de Pesca (SERNAPESCA) and personal communication with SERNAPESCA officials. P...

This paper introduces a socio-ecological analysis of the artisanal fisheries system on Easter Island (27º07′S, 109º22′W) through the identification and interaction of stakeholders. It also comprises a structural analysis of the system aiming to identify any key issues and then propose research and development programs for multiple fisheries that wi...

This paper introduces a socio-ecological analysis of the artisanal fisheries system on Easter Island (27 degrees 07'S, 109 degrees 22'W) through the identification and interaction of stakeholders. It also comprises a structural analysis of the system aiming to identify any key issues and then propose research and development programs for multiple f...

Siphonophores collected in Chilean Patagonian fjords, between the Gulf of Penas and the Trinidad Channel in 2008 were analysed. A total of 12 species were recorded, of which Muggiaea bargmannae, Lensia subtilis, Praya dubia and Sphaeronectes fragilis were identified for the first time in this sector of the Patagonian fjords. M. bargmannae represent...

An integrated ecotoxicological assessment of marine sediments affected by land-based marine fish farm effluents was developed using physicochemical and benthic community structure analyses and standardised laboratory bioassays with bacteria (Vibrio fischeri), amphipods (Ampelisca brevicornis) and sea urchin larvae (Paracentrotus lividus). Intertida...

This study illustrate the use of indicators and models to support the Ecosystem Approach to Fisheries and Aquaculture management using two case studies in Chile: prediction of environmental variability effects upon anchovy (Engraulis ringens) fishery of northern Chile and prediction of suitable sites and carrying capacity of Pacific oyster (Crassos...

This study illustrate the use of indicators and models to support the Ecosystem Approach to Fisheries and Aquaculture management using two case studies in Chile: prediction of environmental variability effects upon anchovy (Engraulis ringens) fishery of northern Chile and prediction of suitable sites and carrying capacity of Pacific oyster (Crassos...

An integrated multi-trophic aquaculture assessment for Pacific oyster (Crassostrea gigas) aquaculture as a bioremediation strategy in areas impacted by fish farm effluents in Rio San Pedro was assessed by combining geographic information system with carrying capacity models. Sites of 0.44 km(2) were evaluated considering constraints; physical facto...

ABSTRACT: The possible effects of climate change on the Chilean marine ecosystems are considered. Relationships between the abundance of exploited species, the fishing effort and the environmental variables, and conceptual models for an ecosystemic management of the fisheries are proposed. A projection for the anchovy (Engraulis ringens) fishery in...

An integrative methodology for site selection of shellfish aquaculture that combines geographical information systems and dynamic farm-scale carrying capacity modeling was developed. The methodology determines suitable aquaculture areas through 3 stages of analysis: (i) analysis of regulatory and social spatial restrictions using GIS to generate a...

El informe da cuenta de los efectos ecologicos y sociales del derrame de petroleo acontecidos en la bahía de Quintero un año después del evento, ademas de información histórica de contaminantes en sedimentos y recursos hidrobiológicos.

Seamounts are vulnerable marine ecosystems. In Chile, information on these ecosystems is quite scarce; thus, a compilation of information on their geographical distribution and biodiversity is presented herein. A total of 118 seamounts distributed in the Chilean EEZ are identified and characterized. Additionally, an in situ assessment was carried o...

Seamounts are vulnerable marine ecosystems. In Chile, information on these ecosystems is quite scarce; thus, a compilation of information on their geographical distribution and biodiversity is presented herein. A total of 118 seamounts distributed in the Chilean EEZ are identified and characterized. Additionally, an in situ assessment was carried o...

In this study the performances of computational neural networks (CNNs), multiple linear regressions (MLRs) and generalised additive models (GAMs) to predict Pacific sardine (Sardinops sagax) landings and to analyse their relationships with environmental factors in the north area off Chile were studied. For this purpose several local and global envi...

ABSTRACT An integrated approach of the Farm Aquaculture Resource Management (FARM) model and Geographical Information System (GIS) has been applied to Pacific oyster aquaculture in suspended longline systems. The performance of the FARM model, applied to simulate potential production, economical data, and water quality impacts at the farm-scale, wa...

Seamounts are vulnerable marine ecosystems. In Chile, information on these ecosystems is quite scarce; thus, a compilation of information on their geographical distribution and biodiversity is presented herein. A total of 118 seamounts distributed in the Chilean EEZ are identified and characterized. Additionally, an in situ assessment was carried o...

Multivariate analyses were applied to explore the relative influence of environmental factors on swordfish (Xiphias gladius) size compositions and catches off Chile. A first analysis was applied to a commercial fishing data base made up of biological-fishery and environmental records from 343 fishing sets performed between 2000 and 2002 by two long...

Multivariate analyses were applied to explore the relative influence of environmental factors on swordfish (Xiphias gladius) size compositions and catches off Chile. A first analysis was applied to a commercial fishing data base made up of biological-fishery and environmental records from 343 fishing sets performed between 2000 and 2002 by two long...

The available environmental, biological, ecological, and fishery data associated with the exploitation of swordfish (Xiphias gladius) in the eastern South Pacific were analyzed and the literature on models aiming at an ecosystem approach to fisheries management was reviewed. The conceptual model set forth in this work incorporates three planes with...

The eastern boundary of the Chile-Peru Current System constitutes one of the most biologically productive ecosystems in the world, due largely to coastal upwelling and the horizontal advection of nutrients. In this ecosystem, El Nino events are of great importance in the interannual variability of the environment. A change was observed in the envir...

A first approach to the pelagic fisheries non-linear modelling was presented by Gutiérrez-Estrada et al. (2007) using a univariate ANN model considering anchovy catches of the previous six months. In this study the performance of artificial neural networks monthly forecast models for anchovy catches in northern Chile (18°21’S-24°S) considering twel...

The eastern boundary of the Chile-Peru Current System constitutes one of the most biologically productive ecosystems in the world, due largely to coastal upwelling and the horizontal advection of nutrients. In this ecosystem, El Niño events are of great importance in the interannual variability of the environment. A change was observed in the envir...

In this study the performance of computational neural networks (CNNs) models to forecast 1-month ahead monthly anchovy catches in the north area of Chile considering only anchovy catches in previous months as inputs to the models was analysed. For that purpose several CNN approaches were implemented and compared: (a) typical autoregressive univaria...

A work of gathering historical fishing (catch, fishing effort, CPUE, characteristics and operation of purseiner fleet) and satellite (NOAA, SeaStar and SeaWind) database of northern Chile, and fishing and oceanographic in situ sampling for validation purpose is made. With this information and the use of geographical information system (GIS) the dis...

In order to verify the ability of RADARSAT-1 images to detect mesoscale oceanic features and the possible link of these oceanographic patterns with jack mackerel (Trachurus murphyi) distribution in the waters off central Chile, a project was developed as part of the Canada Centre for Remote Sensing Globesar-2 program. The combined use of simultaneo...

This project recognizes the importance of the satellite technology for a better understanding of the small pelagic fish distribution and how it would allow improve the efficiency of the purse seiner fleet. In one first stage the project was concentrated in gather information through bibliographies, interviews, surveys, fishing and satellite histori...

Los rendimientos de sardina común (Strangomera bentinki) y principalmente de anchoveta (Engraulis ringens), muestran anomalías negativas asociadas a los eventos El Niño. No obstante, la no recuperación de estas pesquerías después de 1976 coincide con la caída en el largo plazo del Indice de la Oscilación del Sur, asociada al establecimiento de un p...

Small pelagic fishes support economically valuable purse seine fisheries in the South East Pacific, and are one of the major contributors to world fish production (FAO 1997). Since the distribution and abundance of these resources are strongly influenced by environmental conditions (Yáñez et al.2001), the fishing industry should adapt a fishing str...

A time series analysis of long-term climate variability in northern Chile (18°21′–24°00′S) shows anomalies associated with the El Niño events and the longer warm period observed since 1976, followed by a cooling trend since mid 1980s. The succession of pelagic fisheries, anchovy (Engraulis ringens) and sardine (Sardinops sagax), occurring in this f...

A time series analysis of long-term climate variability in northern Chile (18°21�–24°00�S) shows anomal-ies associated with the El Nin ̃o events and the longer warm period observed since 1976, followed by acooling trend since mid 1980s. The succession of pelagic fisheries, anchovy (Engraulis ringens) and sardine(Sardinops sagax), occurring in this...

Probable fishing grounds (PFG) of anchovy ( E ngraulis ringens ) for the industrial purse seiner fleets in northern Chile (18°21'-24°S) are determined by sea surface temperature (SST) and thermal gradients (TGR) information estimated with NOAA AVHRR data and validated with i n situ data. Using a Geographical Information System (GIS), relations betw...

The spiny rock lobster (Jasus frontalis) stock exploited in the Robinson Crusoe and Santa Clara islands of Juan Fernandez archipelago (33º40'S-80º00'W), is assessed and the exploitation state is analyzed. An analysis of cohort at size (ACT) model is adjusted to the fishery carried out in the 1996-97 season. The fishing mortality of the totally recr...

The spiny rock lobster (Jasus frontalis) stock exploited in the Robinson Crusoe and Santa Clara islands of Juan Fernandez archipelago (33°40'S-80°00'W), is assessed and the exploitation state is analyzed. An analysis of cohort at size (ACT) model is adjusted to the fishery carried out in the 1996-97 season. The fishing mortality of the totally recr...

This paper shows a methodological procedure to aquaculture site selection for the development of salmonid and bivalve mollusk culture. The proposal includes different processes of digital cartographic analysis and management of relational data bases in matrixes work applying a Geographical Information System (GIS). The basis of this procedure is a...

This paper shows a methodological procedure to aquaculture site selection for the development of salmonid and bivalve mollusk culture. The proposal includes different processes of digital cartographic analysis and management of relational data bases in matrixes work applying a Geographical Information System (GIS). The basis of this procedure is a...

En Chile central el pez espada (Xiphias gladius) se distribuye más bien en ciertas temperaturas de aguas de origen oceánico, que en discontinuidades térmicas que se forman entre éstas y las frías más costeras. Estas características de la superficie del mar (TSM) se visualizan en las imágenes de TSM confeccionadas con datos de satélites NOAA, a pesa...

The swordfish (Xiphias gladius) in Chile's central zone is associated to certain temperatures from waters of oceanic origin rather than to thermal discontinuities formed between them and the shoreward waters. These features of the sea surface are visualized from the temperature (SST) images produced from NOAA satellite data, in spite of the cloud c...

RESUMEN. En Chile central el pez espada (Xiphias gladius) se distribuye más bien en ciertas temperaturas de aguas de origen oceánico, que en discontinuidades térmicas que se forman entre éstas y las frías más costeras. Estas caracte-rísticas de la superficie del mar (TSM) se visualizan en las imágenes de TSM confeccionadas con datos de satélites NO...

The swordfish (Xiphias gladius) in Chile's central zone is associated to certain temperatures from waters of oceanic origin rather than to thermal discontinuities formed between them and the shoreward waters. These features of the sea surface are visualized from the temperature (SST) images produced from NOAA satellite data, in spite of the cloud c...