Consulta: subjectFacets:"Small pelagic fish"
Registros recuperados: 15
Data/hora: 14/06/2024 02:31:13

Potential economic impacts of achieving good environmental status in Black Sea fisheries
Provedor de dados: 7
Autores: Goulding, Ian C; Megapesca Lda, Portugal; ian@megapesca.com; Stobberup, Kim A; Megapesca Lda, Portugal; megapesca@mail.telepac.pt.
The Marine Strategy Framework Directive (MSFD) mandates that European Union (EU) member states achieve Good Environmental Status (GEnS) based on an ecosystem-based approach to management. For commercial fisheries, the primary target under the MSFD is one of maximum sustainable yield. Of Black Sea riparian nations, only Romania and Bulgaria are EU member states. Focusing at the supranational level, we review institutions and instruments relevant to management of the Black Sea. The economic values of current fish catches are assessed, and the results of a recent analytical assessment of fish stocks are used to estimate potential future values based on maximum sustainable yields. In the Black Sea region, despite long-standing attempts to improve fisheries...
Tipo: Peer-Reviewed Synthesis
Palavras-chave: Black Sea; Economic impacts; Good Environmental Status; Marine Strategy Framework Directive; Maximum sustainable yield; Small pelagic fish.
Ano: 2014

Complex small pelagic fish population patterns arising from individual behavioral responses to their environment
Provedor de dados: 5
Autores: Brochier, Timothee; Auger, Pierre-amael; Pecquerie, Laure; Machu, Eric; Capet, Xavier; Thiaw, Modou; Mbaye, Baye Cheikh; Braham, Cheikh-baye; Ettahiri, Omar; Charouki, Najib; Sene, Ousseynou Ndaw; Werner, Francisco; Brehmer, Patrice.
Small pelagic fish (SPF) species are heavily exploited in eastern boundary upwelling systems (EBUS) as their transformation products are increasingly used in the world food chain. Management relies on regular monitoring, but there is a lack of robust theories for the emergence of the populations’ traits and their evolution in highly variable environments. This work aims to address existing knowledge gaps by combining physical and biogeochemical modelling with an individual life-cycle based model applied to round sardinella (Sardinella aurita) off northwest Africa, a key species for regional food security. Our approach focused on the processes responsible for seasonal migrations, spatio-temporal size-structure, and interannual biomass fluctuations....
Tipo: Text
Palavras-chave: Small pelagic fish; Sardinella aurita; Fish migration; Eastern boundary upwelling system; Individual based biophysical models; Dynamic energy budget.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00433/54433/56088.pdf

Mécanismes sous-jacents du contrôle bottom-up des populations de sardines dans le Golfe du Lion : enseignements tirés des expériences et de la modélisation
Provedor de dados: 5
Autores: Queiros, Quentin.
The Gulf of Lions has faced a sharp drop in the catches of its two main small pelagic exploited species, the sardine Sardina pilchardus and the anchovy Engraulis encrasicolus since the mid-2000s, despite both population abundances remaining high. This situation has been due to a severe decrease in individual body condition and size as a result of both lower growth and the disappearance of the oldest and largest individuals. While overfishing, predation or disease outbreaks have been refuted to explain this situation, one major hypothesis remained to be investigated. A potential shift in sardine and anchovy diet towards smaller planktonic prey indeed suggested bottom-up control as the main driver of these populations in the Gulf of Lions. The first aim of...
Tipo: Text
Palavras-chave: Poissons petits pélagiques; Expérience; Processus bottom-up; Modélisation; Traits d'histoire de vie; Small pelagic fish; Experiment; Bottom-Up processes; Modeling; Life history traits.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00692/80420/83556.pdf

Habitat suitability modelling for sardine juveniles (Sardina pilchardus) in the Mediterranean Sea
Provedor de dados: 5
Autores: Giannoulaki, Marianna; Pyrounaki, Maria M.; Liorzou, Bernard; Leonori, Iole; Valavanis, Vasilis D.; Tsagarakis, Konstantinos; Bigot, Jean-louis; Roos, David; De Felice, Andrea; Campanella, Fabio; Somarakis, Stylianos; Arneri, Enrico; Machias, Athanassios.
Identification of potential juvenile grounds of short-lived species such as European sardine (Sardina pilchardus) in relation to the environment is a crucial issue for effective management. In the current work, habitat suitability modelling was applied to acoustic data derived from both the western and eastern part of the Mediterranean Sea. Early summer acoustic data of sardine juveniles were modelled using generalized additive models along with satellite environmental and bathymetry data. Selected models were used to construct maps that exhibit the probability of presence in the study areas, as well as throughout the entire Mediterranean basin, as a measure of habitat adequacy. Areas with high probability of supporting sardine juvenile presence...
Tipo: Text
Palavras-chave: Generalized additive models; Habitat suitability modelling; Mediterranean Sea; Potential juvenile habitat; Sardine juveniles; Small pelagic fish.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00043/15390/12822.pdf

Fish-length based indicators for improved management of the sardinella fisheries in Senegal
Provedor de dados: 5
Autores: Baldé, Bocar Sabaly; Fall, Massal; Kantoussan, Justin; Sow, Fambaye Ngom; Diouf, Malick; Brehmer, Patrice.
Fisheries management is difficult especially in developing countries where there are little or no data available for stock assessment. Here, a simple model based on the length-based Bayesian biomass (LBB) is applied to length frequencies collected on the two sardinella species (Sardinella maderensis and S. aurita) collected in Senegalese waters (2004 to 2014) to diagnose these stocks and to support the development of fishery management options that may improve the livelihoods of artisanal fishermen. Annual mean length of both species of sardinella showed a large variation during the decadal study period. It is assumed that such variations are due to environmental changes. According to our results, based on the current exploitation rate, both sardinella...
Tipo: Text
Palavras-chave: Data poor fisheries; Fisheries management; Shared stocks; Small scale fisheries; Small pelagic fish; West Africa.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00512/62318/67184.pdf

Évolution de l'écosystème pélagique du Golfe de Gascogne pendant la période 1990-2003. Conséquences sur la capturabilité des espèces
Provedor de dados: 5
Autores: Villalobos, Hector.
Several small pelagic fish species contribute remarkably to world catch. Their populations are, however, characterized by large biomass fluctuations strongly affecting fisheries. The fishing gears and methods used to capture small pelagics have evolved to exploit the highly developed shoaling behavior of these species. Hence, faced to modern fishing this gregarious behavior becomes a disadvantage for fish. Fish behavior may be affected by environmental conditions and by fishing, at the same time that behavior impacts fishing. In this study, we seek to characterize the aggregative systems of small pelagic fishes inhabiting the Bay of Biscay by analyzing "acoustic images", defined as the group of echoes (planktonic layers, shoals, isolated targets) detected...
Tipo: Text
Palavras-chave: Biscay Bay; Hydrological landscapes; Fishery; Atlantic mackerel; Atlantic horse mackerel; European sardine; European anchovy; Small pelagic fish; Acoustic image; Agregation pattern; School descriptors; Golfe de Gascogne; Paysages hydrologiques; Pêcherie; Maquereau; Chinchard; Sardine; Anchois; Petits poissons pélagiques; Image acoustique; Type d'agrégation; Descripteurs de bancs.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/these-6083.pdf

Bonga shad (   Ethmalosa fimbriata   ) spawning tactics in an upwelling environment
Provedor de dados: 5
Autores: Baldé, Bocar Sabaly; Döring, Julian; Ekau, Werner; Diouf, Malick; Brehmer, Patrice.
Successful recruitment in small pelagic fish populations inhabiting upwelling zones is subject to variation in fecundity and is driven by spatial and temporal fluctuations in environmental conditions, that is, mainly sea surface temperature, salinity and food availability. These fluctuations in abiotic factors have stimulated small pelagic fish populations to exhibit specifically adapted spawning tactics. To better understand to what extent a short‐lived exploited fish species such as bonga shad Ethmalosa fimbriata has adapted to an upwelling environment, we have investigated the interrelationship between upwelling intensity as a proxy for productivity and population fecundity by means of a virtual population analysis. We found that females of intermediate...
Tipo: Text
Palavras-chave: Climate change; Clupeid; Data-poor fisheries; Fecundity; Optimal environmental window; Reproductive adaptation; Small pelagic fish.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00516/62765/67164.pdf

Evidence of a variable "unsampled" pelagic fish biomass in shallow water (&lt; 20 m): the case of the Gulf of Lion
Provedor de dados: 5
Autores: Brehmer, P; Guillard, J; Guennegan, Yvon; Bigot, Jean-louis; Liorzou, Bernard.
Studies of small pelagic fish biomass are limited by the fact that research vessels and fishing boats are usually restricted to working areas with a bottom depth &gt; 20 m. Consequently, "unsampled" areas can represent a large proportion of the continental shelf, and the biomass in those areas can be important and must be taken into account in assessment methods in order to avoid misleading interpretations in population dynamics. A time-series tell years long has been compiled from acoustic-assessment surveys of small pelagic fish stocks, and the results show an overall increase in the acoustic fish density towards the coast, where values were the highest. Additional experiments on transects covering shallow-water areas (5-20 m) were conducted from 2001 to...
Tipo: Text
Palavras-chave: Spatial distribution; Small pelagic fish; Shallow water; Hydroacoustic methods; Assessment.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1674.pdf

Influence of planktonic foodweb structure on a system's capacity to support pelagic production: an inverse analysis approach
Provedor de dados: 5
Autores: Marquis, Elise; Niquil, Nathalie; Vezina, Alain F.; Petitgas, Pierre; Dupuy, Christine.
Coupled plankton/small pelagic (SP) fish systems were analysed to assess how foodweb structure influences the export of carbon to pelagic fish during the spring bloom in the Bay of Biscay. The investigation of carbon export flows through inverse analysis was supplemented by estimating the carrying capacity for pelagic fish production by applying linear programming. A planktonic foodweb dominated by microbial pathways had the highest trophic efficiency owing to the tight coupling between planktonic trophic levels and predation pressure on mesozooplankton by fish. Moreover, the magnitude of the gap between carrying capacity and estimated carbon export was related to the size structure of primary producers, with the picophytoplankton-based foodweb having the...
Tipo: Text
Palavras-chave: Bay of Biscay; Carbon export; Carrying capacity; Inverse analysis; Planktonic foodweb; Small pelagic fish.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00035/14583/13375.pdf

Geographic variability of sardine dynamics in the Iberian Biscay region
Provedor de dados: 5
Autores: Silva, A.; Skagen, D. W.; Uriarte, A.; Masse, Jacques; Santos, M. B.; Marques, V.; Carrera, P.; Beillois, Pierre; Pestana, G.; Porteiro, C.; Stratoudakis, Y.
The spatio-temporal variability in the distribution, demographic structure, recruitment, and mortality of sardine within the Iberian Biscay region is described using area-disaggregated data collected during acoustic surveys and at ports since the mid-1980s. Multiple regression models were used to describe log numbers-at-age obtained annually in ten areas covered by three surveys to test the existence of geographic differences in selectivity-at-age, recruitment strength, and mortality and to infer plausible migration routes. Within Iberian waters, sardine biomass was mainly concentrated off western Portugal and the Gulf of Cadiz. In the Bay of Biscay, biomass levels were comparable with those off western Portugal. Recruitment was localized in a few areas...
Tipo: Text
Palavras-chave: Stock structure; Small pelagic fish; Population dynamics; Iberian Peninsula.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6459.pdf

Bioenergetic condition of anchovy and sardine in the Bay of Biscay and English Channel
Provedor de dados: 5
Autores: Gatti, Paul; Cominassi, Louise; Duhamel, Erwan; Grellier, Patrick; Le Delliou, Herve; Le Mestre, Sophie; Petitgas, Pierre; Rabiller, Manuella; Spitz, Jerome; Huret, Martin.
There is a growing interest in monitoring body condition of marine organisms in the context of the ecosystem approach to fisheries and global change. Fish condition is under the influence of environmental variability on seasonal scale, but also on longer timescales. It represents a good indicator of habitat quality or individual fitness, and is also a relevant parameter to evaluate energy transfer through the trophic chain. However, the sources of variability in fish condition need to be accurately understood and the significance of existing indices has to be correctly assessed. Here, we measured the energy density, a precise and global indicator of fish bioenergetic condition, for anchovy (Engraulis encrasicolus) and sardine (Sardina pilchardus) in the...
Tipo: Text
Palavras-chave: Energy density; Calorimetry; Small pelagic fish; Engraulis encrasicolus; Sardina pilchardus; Northeast Atlantic.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00416/52754/53615.pdf

Schooling behaviour of small pelagic fish: phenotypic expression of independent stimuli
Provedor de dados: 5
Autores: Brehmer, Patrice; Gerlotto, François; Laurent, Charline; Cotel, Pascal; Achury, Alina; Samb, Birane.
We compared echo sounder measurements of fish schools on Venezuelan and Senegalese coastal shelves. In both areas Sardinella aurita was the predominant aggregative species; the stocks are known to be genetically independent. Persistent school typology is described by analysing 7 acoustic surveys in Venezuela and comparing with pioneer observations in Senegal. The echo types encountered in both countries were comparable, with S. aurita and their associated species having comparable schooling behaviour. School morphology appears to be more related to species than to global characteristics of their ecosystems, as fish school descriptors were similar for both stocks. Nevertheless, S. aurita may adopt different school morphologies. Differentiation between day...
Tipo: Text
Palavras-chave: Small pelagic fish; Schooling; Phenotypic expression; In situ observations; Echo type; Diel cycle; Behaviour.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2536.pdf

Anchovy population expansion in the North Sea
Provedor de dados: 5
Autores: Petitgas, Pierre; Alheit, Juergen; Peck, Myron A.; Raab, Kristina; Irigoien, Xabier; Huret, Martin; Van Der Kooij, Jeroen; Pohlmann, Thomas; Wagner, Carola; Zarraonaindia, Iratxe; Dickey-collas, Mark.
The abundance and spatial occupation of European anchovy Engraulis encrasicolus have increased in the North Sea since the mid-1990s. We use a cross-disciplinary approach combining genetics, transport modelling, survey time series analyses and physical oceanographic modelling to investigate 3 hypotheses on the reasons for this change. Evidence from connectivity studies suggests that the population of North Sea anchovy is separate from that in the Bay of Biscay. The recruitment pulses observed in survey data fit a life cycle which includes spawning in early summer and larval development in late summer. This also supports the concept of population expansion originating from local remnant population(s). In terms of growth physiology, suitable thermal windows...
Tipo: Text
Palavras-chave: Climate variability; Small pelagic fish; Regime shift; Temperature; Anchovy; North Sea.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00060/17140/14638.pdf

Spring habitats of small pelagic fish communities in the Bay of Biscay
Provedor de dados: 5
Autores: Doray, Mathieu; Hervy, Camille; Huret, Martin; Petitgas, Pierre.
Mapping habitats of species communities helps to inform on the ecological processes which drive their distribution. This information is critical to identify suitable areas for spatial management, aimed at preserving biodiversity, ecosystem functions or essential habitats. While demersal fish have been extensively studied at the community scale, small pelagic fish have mainly been characterised at the population scale. This paper presents a community-based approach on the biodiversity of small pelagic fish, with the aim to: (i) define small pelagic fish communities, (ii) characterise their spatial and interannual dynamics, and (iii) assess their habitats. We present a Multiple Factor Analysis (MFA)-based method that characterises the spatio-temporal...
Tipo: Text
Palavras-chave: Habitat; Small pelagic fish; Bay of Biscay; Spatial distribution; Multiple Factor Analysis.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00411/52236/53046.pdf

Analyse du compartiment mésozooplanctonique et écologie alimentaire printanière de la sardine, Sardina pilchardus (Walbaum, 1782), et de l’anchois, Engraulis encrasicolus (Linné, 1758) adultes dans le Golfe de Gascogne
Provedor de dados: 5
Autores: Dessier, Aurélie.
Dietary studies of marine species constitute an important key to improve the understanding of its biology and of its role in the ecosystem. Thus, prey-predator relationships structure and determine population dynamics and the trophic network at the ecosystem scale. Among the major study sites, the marine ecosystem is submitted to natural and anthropogenic constraints. In the North-Eastern part of the Atlantic Ocean, the Bay of Biscay is a large open area surrounded South by Spain and East by France. This bay is an historic place of intense fishery activities for which the main small pelagic species targeted are the pilchard, Sardina pilchardus and the anchovy, Engraulis encrasicolus. The aim of this work is to analyze the trophic ecology of these two small...
Tipo: Text
Palavras-chave: Petits poissons pélagiques; Traceurs écologiques; Isotopes stables; Parasites; Mercure; Communauté mésozooplanctonique; Qualité du régime alimentaire; Golfe de Chaînes; Zooplancton marin; Isotopes stables; Expérience d’alimentation; Poissons pélagiques -- Gascogne; Small pelagic fish; Ecological tracers; Stable isotopes; Parasites; Mercury; Mesozooplanktonic community; Diet quality; Feeding experiment.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00353/46447/46197.pdf