Biologia do jundiá Rhamdia quelen (Teleostei, Pimelodidae)

Gomes, Levy de Carvalho; Golombieski, Jaqueline Ineu; Chippari-Gomes, Adriana Regina; Baldisserotto, Bernardo

doi:10.1590/s0103-84782000000100029

Cited by 206 publications

(175 citation statements)

References 6 publications

(3 reference statements)

Supporting

Mentioning

108

Contrasting

Unclassified

Order By: Relevance

“…Silver catfish (Rhamdia quelen) is endemic in South American rivers and lakes and has been widely used for aquaculture alone or comingled with other fish species (B (Gomes et al 2000, Barcellos et al 2004b). However, bacteria and parasitic infections (Barcellos et al 2008, Martins et al 2011) remains a major challenge to improve productivity and triggers the need to improve fish health by means of vaccination and PAMPs-enriched diets.…”

Section: Introductionmentioning

confidence: 99%

Immunomodulatory effects of dietary β-glucan in silver catfish (Rhamdia quelen)

Domenico

Canova²,

Soveral³

et al. 2017

Pesq. Vet. Bras.

View full text Add to dashboard Cite

RESUMO.-[Efeito imunomodulador da β-glucana usada como aditivo alimentar em jundiás (Rhamdia quelen).]O uso da β-glucana como suplemento alimentar foi avaliado em jundiás. A β-glucana foi adicionada à ração na proporção de 0.01%, e 0.1% e fornecida aos peixes por 21, para avaliar dados hematológicos e parâmetros do sistema imune natural, ou 42 dias, para avaliar ganho de peso e resistência ao desafio com Aeromonas hydrophila. A adição da β-glucana na dieta não afetou o ganho de peso e não induziu alterações hematológicas nem alterações nos níveis de aglutininas e mieloperoxidase sanguínea. No entanto, a atividade hemolítica natural do sistema do complemento foi significativamente maior nos peixes alimentados com β-glucana. Além disso, nos peixes alimentados com β-glucana e desafiados com A. hydrophila, o número de bactérias isoladas do sangue foi significativamente menor, e a sobrevivência ao desafio foi significativamente maior do que nos peixes que não receberam β-glucana. Consequentemente, concluímos que a β-glucana tem potencial imunomodulador quando adicionada à dieta, nas condições experimentais aqui indicadas, e contribui para aumentar imunidade natural e a resistência dos jundiás ao desafio com patógenos específicos. INTRODUCTIONThe occurrence of infectious diseases is one of the major causes of losses in modern aquaculture (Sitjà-Bobadilla The immunomodulatory effects of dietary β-glucan were evaluated in silver catfish. β-glucan was added to the diet (0.01%, and 0.1%) and fed to the fish for 21 days, to evaluate effects on blood and some innate immune parameter, or fed for 42 days, to evaluate growth rate and resistance to challenge with pathogenic Aeromonas hydrophila. We found that adding β-glucan to the diet had no effect on fish growth and no effect on blood cells, or serum bacterial agglutination and serum myeloperoxidase activity. However, fish that received β-glucan in the diet had the natural hemolytic activity of complement significantly higher compared to control fish. Furthermore, fish fed with β-glucan and challenged with A. hydrophila had fewer bacteria in blood and presented a significantly higher survival rate compared to control fish. Thus, we concluded that β-glucan might be explored as feed additive aiming to improve silver catfish innate immunity and resistance to specific pathogen.INDEX TERMS: Silver catfish, Rhamdia quelen, fish, immunostimulants, β-glucan, Aeromonas hydrophila.

show abstract

Section: Introductionmentioning

confidence: 99%

Immunomodulatory effects of dietary β-glucan in silver catfish (Rhamdia quelen)

Domenico

Canova²,

Soveral³

et al. 2017

Pesq. Vet. Bras.

View full text Add to dashboard Cite

show abstract

“…Another species adapted to the adverse conditions of urban streams is R. quelen. It is omnivorous, prefers low water flow, sand or clay bottom substrate, and is resistant to high temperatures (compared with many other Brazilian species) (Gomes et al, 2000). However, previous studies associating R. quelen with disturbed streams considered its response to physicochemical water oscillation instead of disturbed instream habitats (Casatti et al, 2006;Dias & TejerinaGarro, 2010).…”

Section: Discussionmentioning

confidence: 99%

Influence of environmental variables on stream fish fauna at multiple spatial scales

et al. 2016

View full text Add to dashboard Cite

Effects of environmental variables at different spatial scales on freshwater fish assemblages are relatively unexplored in Neotropical ecosystems. However, those influences are important for developing management strategies to conserve fish diversity and water resources. We evaluated the influences of site-(in-stream) and catchment-scale (land use and cover) environmental variables on the abundance and occurrence of fish species in streams of the Upper Araguari River basin through use of variance partitioning with partial CCA. We sampled 38 1 st to 3 rd order stream sites in September 2009. We quantified site variables to calculate 11 physical habitat metrics and mapped catchment land use/cover. Site and catchment variables explained > 50% of the total variation in fish species. Site variables (fish abundance: 25.31%; occurrence: 24.51%) explained slightly more variation in fish species than catchment land use/cover (abundance: 22.69%; occurrence: 18.90%), indicating that factors at both scales are important. Because anthropogenic pressures at site and catchment scales both affect stream fish in the Upper Araguari River basin, both must be considered jointly to apply conservation strategies in an efficient manner.Os efeitos das variáveis ambientais em diferentes escalas espaciais sobre as assembleias de peixes de água doce ainda é um tema pouco explorado na região Neotropical. Entretanto é um assunto de extrema relevância, pois gera subsídios para definições de estratégias de manejo e conservação de ictiofauna e dos recursos hídricos. Nós avaliamos a influência de variáveis ambientais em escalas local (dentro do rio) e da paisagem (uso e cobertura do solo) na abundância e ocorrência das espécies de peixes de riachos da bacia do alto rio Araguari através da partição da variância usando CCA parcial. Um total de 38 riachos de até 3ª ordem foi amostrado em setembro de 2009. Nós quantificamos variáveis locais para calcular 11 métricas de hábitats físicos e mapeamos o uso e cobertura do solo. O conjunto de dados (variáveis locais e da paisagem) explicou mais de 50% da variação total nas espécies de peixes. Variáveis em escala local (abundância: 25,31%; ocorrência: 24,51%) explicaram levemente uma maior variação nas assembleias de peixes do que o uso e cobertura do solo (abundância: 22,69%; ocorrência: 18,90%), indicando que os fatores em ambas as escalas de estudo são importantes. Uma vez que a influência antrópica em diferentes escalas afeta as espécies de peixes em riachos da bacia do alto rio Araguari, ambas devem ser consideradas juntamente para a adoção de estratégias de conservação de uma forma racional. Keywords IntroductionStreams are hierarchically organized and spatially nested systems (Frissell et al., 1986 in which conditions at smaller spatial scales are constrained by processes at larger spatial scales (O'Neill et al., 1989). In other words, site conditions are influenced by regional conditions (Hildrew & Giller, 1994), and different variables may act at different scales (Willis & Whittaker, 2002). Some...

show abstract

“…The feeding habits considered were: carnivore, omnivore and herbivore. Classification into these categories was based on specific references of feeding habits for each species: traira (PEREIRA et al, 1982), silver catfish (GOMES et al, 2000), hassar (WINEMILLER, 1987) and grass carp (KIRKAGAÇ, 2003). Species were considered carnivores, omnivores or herbivores only when references stated that at least 80% of their meal was based on the specified food.…”

Section: Methodsmentioning

confidence: 99%