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  • Engraulis ringens  (6)
  • 550 - Earth sciences  (5)
  • 1
    Publication Date: 2021-05-19
    Description: En la actualidad, los programas de mercaje son necesarios para estudios de vital importancia en la biología de poblaciones, como los patrones de migración; ya que es un hecho aceptado desde hace casi un siglo que los peces pelágicos especialmente los clupeideos presentan un ciclo migratorio anual, lo que se manifiesta en la pesquería como cambios espaciales y temporales en las zonas de pesca, con las respectivas oscilaciones en la magnitud de sus capturas. Las técnicas de marcación también permiten evaluar la extensión de la distribución geográfica de una población, los patrones de migración, el número total de individuos de una población, sus parámetros de crecimiento y estim aciones de mortalidad.
    Description: Currently, programs are needed to mercaje critical studies in population biology, such as ”migration patterns” as it is an accepted fact for almost a century that pelagic fishes especially clupeideos present a migration cycle annually, which is manifested in the fishery as spatial and temporal changes in fishing areas, with the respective fluctuations in the magnitude of their catch. Marking techniques also to assess the extent of the geographical distribution of a population, migration patterns, the total number of individuals in a population, their growth parameters and mortality estimates.
    Description: Unpublished
    Keywords: Fish meal ; Engraulis ringens
    Repository Name: AquaDocs
    Type: Report , Refereed , Article
    Format: 87pp. & Figuras
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  • 2
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    Instituto de Fomento Pesquero | Valparaíso, Chile
    Publication Date: 2021-05-19
    Description: Este informe entrega como resultado los cálculos de la evaluación de stock de anchoveta, su diagnosis, resultados de un modelo de proyección determinista de capturas para el período 1997-2016 y captura total permisible de 1998.
    Description: This report provides results calculated by the anchovy stock assessment, diagnosis, results of a deterministic forecasting model for the period 1997-2016 catch and total allowable catch for 1998.
    Description: Unpublished
    Keywords: Pelagic fisheries ; Engraulis ringens ; Bathymetric data ; Recruitment ; Trap fishing ; Biomass ; Size-at-age ; Landing statistics ; Fishery resources ; Reproductive behaviour
    Repository Name: AquaDocs
    Type: Report , Refereed , Article
    Format: 53pp. & Figuras
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  • 3
    Publication Date: 2021-05-19
    Description: El presente informe establece las bases biológicas que permiten identificar estrategias de explotación y umbrales para prevenir la sobreexplotación en el recurso sardina común y anchoveta en Chile.
    Description: This report provides the biological basis to help identify strategies to prevent exploitation and overfishing thresholds in the common sardine and anchovy resources in Chile.
    Description: Unpublished
    Keywords: Sexual maturity ; Biomass ; Acoustic data ; Trap fishing ; Landing statistics ; Stock assessment ; Bottom trawling ; Age determination ; Size-at-age ; Longlining ; Length-weight relationships ; Salinity ; Trachurus symmetricus ; Trachurus murphyi ; Engraulis ringens ; Strangomera bentincki
    Repository Name: AquaDocs
    Type: Report , Refereed , Article
    Format: 159pp.
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  • 4
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    Instituto de Fomento Pesquero | Valparaíso, Chile
    Publication Date: 2021-05-19
    Description: El presente informe tiene como objetivo entregar los resultados de la evaluación del stock de anchoveta, su diagnosis y estimación de la captura total permisible para 1997, disminuyendo así el riesgo de sobre-explotación por crecimiento y no desestabilizar los niveles de captura.
    Description: This report aims to deliver the results of the anchovy stock assessment, the diagnosis and estimation of the total allowable catch for 1997, reducing the risk of over-exploitation by growth and not destabilize the catch levels.
    Description: Unpublished
    Keywords: Pelagic fisheries ; Biomass ; Bathymetric data ; Landing statistics ; Recruitment ; Stock assessment ; Size-at-age ; Length-weight relationships ; Salinity ; Sexual maturity ; Biological data ; Trap fishing ; Engraulis ringens
    Repository Name: AquaDocs
    Type: Report , Refereed , Article
    Format: 27pp. & Tablas
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  • 5
    Publication Date: 2021-05-19
    Description: El documento presenta los resultados de la evaluación de la biomasa y distribución espacial de la anchoveta y la fracción reclutas, mediante técnicas acústicas y las condiciones oceanográficas asociadas a este proceso.
    Description: The document presents the results of the assessment of biomass and spatial distribution of an chovy and recruits fraction by acoustic techniques and oceanographic conditions associated with this process.
    Description: Unpublished
    Keywords: Pelagic fisheries ; Engraulis ringens ; Length-weight relationships ; Bathymetric data ; Stock assessment ; Salinity ; Recruitment ; Trap fishing ; Biological data ; Age determination
    Repository Name: AquaDocs
    Type: Report , Refereed , Article
    Format: 121pp. & Figuras
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  • 6
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    Instituto de Fomento Pesquero | Valparaíso, Chile
    Publication Date: 2021-05-19
    Description: El presente informe final tiene como objetivo entregar los resultados y cálculos de una evaluación del stock de anchoveta, su diagnosis y estimación de la captura total permisible para 1996.
    Description: This final report aims to deliver the results and calculations of a stock assessment of anchovy, its diagnosis and estimation of the total allowable catch for 1996.
    Description: Unpublished
    Keywords: Spawning ; Stock assessment ; Bathymetric data ; Pelagic fisheries ; Recruitment ; Biomass ; Size-at-age ; Trap fishing ; Landing statistics ; Aquaculture ; Fishery resources ; Reproductive behaviour ; Engraulis ringens ; Eggs ; Larvae
    Repository Name: AquaDocs
    Type: Report , Refereed , Article
    Format: 31pp. & Figuras
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  • 7
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/conferenceObject
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  • 8
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/article
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  • 9
    Publication Date: 2020-02-12
    Description: Abstract: In this paper we compare two different methodologies for Fractional Vegetation Cover (FVC) retrieval from Compact High Resolution Imaging Spectrometer (CHRIS) data onboard the European Space Agency (ESA) Project for On-Board Autonomy (PROBA) platform. The first methodology is based on empirical approaches using Vegetation Indices (VIs), in particular the Normalized Difference Vegetation Index (NDVI) and the Variable Atmospherically Resistant Index (VARI). The second methodology is based on the Spectral Mixture Analysis (SMA) technique, in which a Linear Spectral Unmixing model has been considered in order to retrieve the abundance of the different constituent materials within pixel elements, called Endmembers (EMs). These EMs were extracted from the image using three different methods: i) manual extraction using a land cover map, ii) Pixel Purity Index (PPI) and iii) Automated Morphological Endmember Extraction (AMEE). The different methodologies for FVC retrieval were applied to one PROBA/CHRIS image acquired over an agricultural area in Spain, and they were calibrated and tested against in situ measurements of FVC estimated with hemispherical photographs. The results obtained from VIs show that VARI correlates better with FVC than NDVI does, with standard errors of estimation of less than 8% in the case of VARI and less than 13% in the case of NDVI when calibrated using the in situ measurements. The results obtained from the SMA-LSU technique show Root Mean Square Errors (RMSE) below 12% when EMs are extracted from the AMEE method and around 9% when extracted from the PPI method. A RMSE value below 9% was obtained for manual extraction of EMs using a land cover use map.
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/article
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  • 10
    Publication Date: 2020-02-12
    Description: We report a nitrogen isotope record (ODP Site 1233) from the southern Chile margin at 41�S. The site is located slightly south of the southern boundary of the Peru�Chile upwelling system and the associated oxygen minimum zone off Peru and northern Chile. We show that our nitrogen isotope record, from the time interval 0�50 calendar kiloyears before present (ka B.P.), bears an atypical pattern both in shape and timing when compared with records obtained from either the continental margin of the eastern Pacific or the Subantarctic Zone (SAZ) of the Southern Ocean. The δ15N values at Site 1233 are relatively high throughout the record, varying between 9� and 13�. The major features are a pronounced δ15N increase at the beginning of the deglaciation, a maximum from 19 to 10 ka B.P.; thereafter a large decrease during the early Holocene, and millenial scale oscillations showing an Antarctic timing. We propose that the record results from an amalgam of low-latitude and high-latitude processes. Low-latitude processes, including a stronger advection signal of heavy nitrates from the denitrifying zones off Peru and northern Chile, would explain the timing of the deglaciation rise and the heaviest values found over this interval, excluding the Antarctic Cold Reversal period. The overall differences between site 1233 and records from Peru and northwest American margins suggest however that the origin of the δ15N signal off Chile is largely controlled by hydrologic and climatic changes in the Southern Ocean. We propose that the interplay between nutrient demand in the SAZ and latitudinal shifts of hydrologic fronts controlled both the concentrations and the isotopic signature of the remaining nitrate delivered to the Chile margin. Then, the glacial surface waters of the southern Chile margin were likely lower in nitrate concentration and bear a higher δ15N than during interglacial periods.
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/article
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