Consulta: subjectFacets:"Fish migration"
Registros recuperados: 14
Data/hora: 06/06/2024 02:17:59

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

Validation of otolith δ18O values as effective natural tags for shelf-scale geolocation of migrating fish
Provedor de dados: 5
Autores: Darnaude, Audrey M.; Hunter, Ewan.
The oxygen isotopic ratio of fish otoliths is increasingly used as a 'natural tag' to assess provenance in migratory species, with the assumption that variations in delta O-18 values closely reflect individual ambient experience of temperature and/or salinity. We employed archival tag data and otoliths collected from a shelf-scale study of the spatial dynamics of North Sea plaice Pleuronectes platessa L., to examine the limits of otolith delta O-18-based geolocation of fish during their annual migrations. Detailed intra-annual otolith delta O-18 measurements for 1997-1999 from individuals of 3 distinct sub-stocks with different spawning locations were compared with delta O-18 values predicted at the monthly, seasonal and annual scales, using predicted...
Tipo: Text
Palavras-chave: Fish migration; Oxygen; Stable isotopes; Natural tag; Site fidelity; Plaice; Pleuronectes platessa.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00626/73782/75084.pdf

Upstream dam impacts on gilded catfish Brachyplatystoma rousseauxii (Siluriformes: Pimelodidae) in the Bolivian Amazon
Provedor de dados: 5
Autores: Van Damme, Paul A.; Córdova-clavijo, Leslie; Baigún, Claudio; Hauser, Marilia; Da Costa Doria, Carolina R.; Duponchelle, Fabrice.
This paper explores the effects of two run-of-river dams (Jirau and Santo Antônio) built in cascade in the middle Madeira River (Brazil) on the interruption of long-distance migration routes of the gilded catfish (Brachyplatystoma rousseauxii). A participative monitoring system was set up to compare capture by commercial fishers approximately 1500 km upstream of the dams in Bolivia, before (1998-2007) and after (2015-2017) dam closure. A significant decrease in gilded catfish catches and in catch per unit effort was observed after dam closure, whereas no significant difference in mean weight was found. Back-estimation of age suggests that the few individuals remaining after dam closure in 2009 are a mixture of old homers that returned upstream before dam...
Tipo: Text
Palavras-chave: Environmental impact; Fish migration; Fishways; Madeira dams; River connectivity.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00595/70723/68957.pdf

Genomics and telemetry suggest a role for migration harshness in determining overwintering habitat choice, but not gene flow, in anadromous Arctic Char
Provedor de dados: 5
Autores: Moore, Jean-sebastien; Harris, Les N.; Le Luyer, Jeremy; Sutherland, Ben J. G.; Rougemont, Quentin; Tallman, Ross F.; Fisk, Aaron T.; Bernatchez, Louis.
Migration is a ubiquitous life history trait with profound evolutionary and ecological consequences. Recent developments in telemetry and genomics, when combined, can bring significant insights on the migratory ecology of non-model organisms in the wild. Here, we used this integrative approach to document dispersal, gene flow and potential for local adaptation in anadromous Arctic Char from six rivers in the Canadian Arctic. Acoustic telemetry data from 124 tracked individuals indicated asymmetric dispersal, with a large proportion of fish (72%) tagged in three different rivers migrating up the same short river in the fall. Population genomics data from 6,136 SNP markers revealed weak, albeit significant, population differentiation (average pairwise FST =...
Tipo: Text
Palavras-chave: Arctic; Conservation; Fish migration; Fishery management; Genotyping by sequencing; Population genomics; RADseq.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00409/52049/52719.pdf

Environmental factors related to entry into and ascent of fish in the experimental ladder located close to Itaipu Dam
Provedor de dados: 83
Autores: Fernandez,Domingo Rodrigues; Agostinho,Angelo Antonio; Bini,Luis Maurício; Gomes,Luiz Carlos.
We evaluated the seasonality of the ascent of fish in an experimental ladder located close to Itaipu Dam, and its relationships to reproduction, temperature, river level and discharge. Samplings of fish and measurements of abiotic factors were performed from February, 1995 through January, 1997, in two resting pools of the ladder. Pool A was located 10 m above the mean level of the Paraná River; Pool B was located at the upper end of the ladder, at a height of 27 m. Autoregressive models were used to remove the temporal dependence between observations. Residuals of the models were used to relate, using Pearson's correlation coefficient, the densities of fish to the environmental variables. Clear patterns of seasonality were observed for temperature. River...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish ladder; Fish migration; Environmental factors; Paraná River.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000200009

Fish ladders: safe fish passage or hotspot for predation?
Provedor de dados: 83
Autores: Agostinho,Angelo Antonio; Agostinho,Carlos Sergio; Pelicice,Fernando Mayer; Marques,Elineide Eugênio.
Fish ladders are a strategy for conserving biodiversity, as they can provide connectivity between fragmented habitats and reduce predation on shoals that accumulate immediately below dams. Although the impact of predation downstream of reservoirs has been investigated, especially in juvenile salmonids during their downstream movements, nothing is known about predation on Neotropical fish in the attraction and containment areas commonly found in translocation facilities. This study analysed predation in a fish passage system at the Lajeado Dam on the Tocantins River in Brazil. The abundance, distribution, and the permanence (time spent) of large predatory fish along the ladder, the injuries imposed by piranhas during passage and the presence of other...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dam; Fish migration; Fish pass; Piscivores; Serrasalmus.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000400001

A barrier to upstream migration in the fish passage of Itaipu Dam (Canal da Piracema), Paraná River basin
Provedor de dados: 83
Autores: Fontes Júnior,Hélio Martins; Castro-Santos,Theodore; Makrakis,Sergio; Gomes,Luiz Carlos; Latini,João Dirço.
The majority of the fish passages built in the Neotropical region are characterised by low efficiency and high selectivity; in many cases, the benefits to fish populations are uncertain. Studies conducted in the Canal da Piracema at Itaipu dam on the Parana River indicate that the system component designated as the Discharge channel in the Bela Vista River (herein named Canal de deságue no rio Bela Vista or CABV), a 200 m long technical section, was the main barrier to the upstream migration. The aim of this study was to evaluate the degree of restriction imposed by the CABV on upstream movements of Prochilodus lineatus and Leporinus elongatus, Characiformes. Fish were tagged with passive integrated transponders (PIT tags) and released both downstream and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish migration; Nature-like; Neotropical fishes; PIT-tag; Telemetry.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000400002

Upstream dam impacts on gilded catfish Brachyplatystoma rousseauxii (Siluriformes: Pimelodidae) in the Bolivian Amazon
Provedor de dados: 83
Autores: Damme,Paul A. Van; Córdova-Clavijo,Leslie; Baigún,Claudio; Hauser,Marilia; Doria,Carolina R. da Costa; Duponchelle,Fabrice.
ABSTRACT This paper explores the effects of two run-of-river dams (Jirau and Santo Antônio) built in cascade in the middle Madeira River (Brazil) on the interruption of long-distance migration routes of the gilded catfish (Brachyplatystoma rousseauxii). A participative monitoring system was set up to compare capture by commercial fishers approximately 1500 km upstream of the dams in Bolivia, before (1998-2007) and after (2015-2017) dam closure. A significant decrease in gilded catfish catches and in catch per unit effort was observed after dam closure, whereas no significant difference in mean weight was found. Back-estimation of age suggests that the few individuals remaining after dam closure in 2009 are a mixture of old homers that returned upstream...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environmental impact; Fish migration; Fishways; Madeira dams; River connectivity.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000500213

Diel variation in the ascent of fishes up an experimental fish ladder at Itaipu Reservoir: fish size, reproductive stage and taxonomic group influences
Provedor de dados: 83
Autores: Fernandez,Domingo Rodriguez; Agostinho,Angelo Antonio; Bini,Luis Mauricio; Pelicice,Fernando Mayer.
In this study, we evaluated the fish ascent in the experimental ladder at Itaipu Reservoir (Paraná State, Brazil), in relation to diel variation, fish size, reproductive stages and species composition. The study was carried out from October, 1995 to February, 1996 and from November, 1996 to January, 1997 at two points on the ladder (boxes at heights of 10 and 27 m). Twenty-two species were recorded, and Prochilodus lineatus, Pimelodus maculatus, Leporinus obtusidens, Schizodon borellii and Leporinus friderici accounted for 86.6 % of the total catch. Fish length did not differ between diel periods and boxes. On the other hand, fish abundance of the main species was significantly influenced by box position, reproductive stage and diel period. The higher box...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish migration; Fish passage; Selectivity; Non-reproductive fish; Management.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000200016

Movements through a fish ladder: temporal patterns and motivations to move upstream
Provedor de dados: 83
Autores: Agostinho,Carlos Sérgio; Pereira,Celiana Ribeiro; Oliveira,Rafael José de; Freitas,Iriene Siqueira; Marques,Elineide Eugênio.
Fish passages are constructed with the aim of reestablishing connectivity between critical habitats, in order to sustain those species that move over a large area during their lives. The upstream movements of most of the known migratory species are made for purposes of reproduction (adults) or dispersal (juveniles). The present study was conducted at the ladder constructed at Lajeado Dam (Luis Eduardo Magalhães Hydroelectric Power), on the Tocantins River. The objective was to assess whether there is a temporal pattern in the abundance of fish below the dam and in the ladder, that correlates with their breeding seasons. Additionally, it was examined whether reproduction is the predominant motivation of the shoals of fish that ascend the ladder. Samples...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish migration; Fish conservation; Biodiversity; Reservoir; Seasonality.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000200010

The roles of marginal lagoons in the maintenance of genetic diversity in the Brazilian migratory fishes Prochilodus argenteus and P. costatus
Provedor de dados: 83
Autores: Melo,Bruno F.; Sato,Yoshimi; Foresti,Fausto; Oliveira,Claudio.
The rio São Francisco basin contains many endemic species, such as Prochilodus argenteus and P. costatus, which have great commercial importance. However, information about the main recruitment sites and genetic studies containing extensive sampling of these species are scarce. To investigate the roles of the marginal lagoons in the maintenance of genetic variability and in the population structure, we analyzed six microsatellite loci in nine sampling groups of P. argenteusand five sampling groups of P. costatus. Our results showed high levels of genetic variability and low values of genetic differentiation for P. argenteus (FST =0.008, P&lt; 0.05) and for P. costatus(FST =0.031, P &lt; 0.05). In addition, high values of gene flow combined with a small...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conservation genetics; Fish migration; Microsatellite; Nursery area; Rio São Francisco basin.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000300625

Evidence of habitat fragmentation affecting fish movement between the Patos and Mirim coastal lagoons in southern Brazil
Provedor de dados: 83
Autores: Burns,Marcelo D. M.; Garcia,Alexandre M.; Vieira,João P.; Bemvenuti,Marlise A.; Marques,David M. L. Motta; Condini,Vinicius.
The communication between the Patos and Mirim lagoon systems occurs via a natural channel called São Gonçalo. In 1977, a dam was built in this channel to prevent entrance of saline waters from Patos Lagoon estuary into the Mirim Lagoon. Our results showed an abrupt discontinuity in salinity and fish species distribution along the study sites. Sites below the dam showed salinity values higher than zero, whereas sites above had zero salinity values across all sampling periods. Marine and estuarine fishes (e.g., mullets Mugil platanus, M. curema, silversides Odontesthes argentinensis, Atherinella brasiliensis, sardine Brevoortia pectinata, and white croaker Micropogonias furnieri) were not captured above the dam. If these juvenile fishes could enter the Mirim...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dam; Fish migration; Artisanal fishery; Estuary.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000100006

Blockage of migration routes by dam construction: can migratory fish find alternative routes?
Provedor de dados: 83
Autores: Antonio,Rosimeire Ribeiro; Agostinho,Angelo Antonio; Pelicice,Fernando Mayer; Bailly,Dayani; Okada,Edson Kioshi; Dias,João Henrique Pinheiro.
The present study explored the interaction between the upriver migration of fish and the blockage of their migration routes by dam construction. Specifically, we studied (i) the capacity of migratory fish to locate alternative routes in the presence of an obstacle, and (ii) the behavior of the fish after they were artificially transferred to the reservoir. With the use of the mark-recapture technique (tagging), the study was carried out near Porto Primavera Dam (UHE Engenheiro Sérgio Motta) between 1994 and 1999, a period prior to the closure of the floodgates and the installation and operation of the fish pass facilities. The fish were caught in the dam forebay downstream, marked with LEA type tags, and released upstream (5113 individuals; 14 species) and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish migration; Fish pass; Tagging; Paraná River; Porto Primavera Reservoir.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000200012

Selection of an experimental fish ladder located at the dam of the Itaipu Binacional, Paraná River, Brazil
Provedor de dados: 52
Autores: Fernandez,Domingo Rodriguez; Agostinho,Angelo Antônio; Bini,Luis Mauricio.
The specific selection of a weir and orifice type experimental fish ladder in the dam of the Itaipu Reservoir (Paraná River) was evaluated by samplings in the river downstream and at two points along the ladder (at heights of 10 m and 27 m) during 28 months. Among the 65 species recorded in the river (immediate downstream of the dam), 27 were captured on the ladder. The species that showed highest density on the ladder, the majority migratory, were moderately, or only slightly, abundant downstream. Among the most abundant species downstream, only one, non-migratory, was recorded in the ladder. The structure presented a negative selection in relation to large migratory pimelodids that might be overcome by enlarging the scale of its design. The sampling...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish ladder; Fish migration; Selectivity; Fish transposition; Reservoir.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000400012