Plasma ion levels of freshwater and marine/estuarine teleosts from Southern Brazil

Becker, Alexssandro Geferson; Gonçalves, Jamile Fabbrin; Toledo, Jaderson dos Anjos; Burns, Marcelo Dias de Mattos; Garcia, Luciano de Oliveira; Vieira, João Paes; Baldisserotto, Bernardo

doi:10.1590/s1679-62252011005000039

Cited by 7 publications

(3 citation statements)

References 29 publications

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“…Our results showed no significant change in water content of fat snook muscle and gills or Na + and K + plasma levels between anesthetized fish and controls in the same salinity. Plasma ion levels of fat snook were within the expected range for tropical fish (Becker et al, 2011). SW-adapted fish showed a higher Na + plasma levels than FW-adapted ones, and this was expected because SW acclimation increased osmolality in Mozambique tilapia (Oreochromis mossambicus) (Fiess et al, 2007) and plasma level of Na + and Cl -in European flounder (Platichthys flesus) (Lundgreen et al, 2008), Micropogonias furnieri and Genidens barbus (Becker et al, 2011) compared to FW-adapted specimens.…”

Section: Eo-y (µL Lmentioning

confidence: 60%

Anesthesia and transport of fat snook Centropomus parallelus with the essential oil of Nectandra megapotamica(Spreng.) Mez

et al. 2013

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This study analyzed the chemical composition and anesthetic potential of essential oil (EO) of Nectandra megapotamica in fat snook (Centropomus parallelus). For the extraction of EO by hydrodistillation, leaves were separated in young (EO-Y) or old (EO-O), and the chemical composition of the EOs was determined by CG-MS. The anesthetic potential was assessed by the evaluation of induction and recovery time of anesthesia and stress response from anesthesia and transport. Three experiments were carried out: i) four different concentrations of each EO were tested to evaluate anesthesia induction and recovery time; ii) two concentrations of EO-O were tested for the evaluation of its effects on stress parameters (glucose, lactate, and Na + and K + plasma levels) caused by anesthesia; and iii) fish were transported in plastic bags, supplied with two concentrations of EO-O for the evaluation of water quality and mortality. All experiments were performed on fish acclimated to 0 and 33 ppt salinity. The main constituents of the Y and O-EOs were bicyclogermacrene (46.5/34.6%), α-pinene (26.8/26.2%), β-pinene (7.9/12.3%), and germacrene D (9.6/9.1%). Mild sedation was achieved at 30 µL L -1 (1.3-3.2 min) and deep anesthesia at 150 µL L -1 (5.6-8.0 min) with both EOs. The recovery time ranged from 1-10 min. The EO-O was not able to avoid the stress of anesthesia evidenced by elevated glucose and lactate plasma levels observed in all groups. Plasma levels of Na + and K + were not significantly affected by treatments. During transport, the use of EO-O did not prevent deterioration in water quality and the post-transport mortality. In conclusion, the EO of N. megapotamica has anesthetic activity in fat snook, but it was not able to prevent the stress of anesthesia and transport.Este estudo analisou a composição química e o potencial anestésico do óleo essencial (OE) de Nectandra megapotamica em robalos-peva (Centropomus parallelus). Para a extração do OE por hidrodestilação, as folhas foram separadas em jovens (OE-J) ou velhas (OE-V) e a composição química foi determinada por CG-EM. O potencial anestésico foi acessado através da avaliação do tempo de indução e recuperação da anestesia e resposta ao estresse do procedimento anestésico e transporte. Foram realizados três experimentos: em primeiro lugar, quatro concentrações diferentes de cada OE foram testadas para avaliar o tempo de indução à anestesia e de recuperação; em segundo lugar, duas concentrações do OE-V foram testadas para avaliar os efeitos sobre os parâmetros de estresse (níveis plasmáticos de glicose, lactato, Na + e K + ) causados pelo procedimento anestésico; em terceiro lugar, os peixes foram transportados em sacos plásticos com duas concentrações do OE-V para avaliação da qualidade da água e mortalidade. Todos os experimentos foram realizados em peixes aclimatados à salinidade zero e 33. Os constituintes majoritários do OE-J e OE-V foram: biciclogermacreno (46,5/34,6%), α-pineno (26,8/26,2%), β-pineno (7,9/12,3%) e germacreno D (9,6/9,1%). Sedação leve foi alca...

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Section: Eo-y (µL Lmentioning

confidence: 60%

Anesthesia and transport of fat snook Centropomus parallelus with the essential oil of Nectandra megapotamica(Spreng.) Mez

et al. 2013

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“…These euryhaline species are widespread along the marine− estuarine gradient of this region (Chao et al 1985, with most spawning in the sea and their juveniles particularly abundant in shallow waters (<1.5 m) of the estuary (Chao et al 1985, Becker et al 2011, where food is . The marine estuarine-dependent species studied are commonly found between the Patos Lagoon Estuary and adjacent marine areas probably because salinity differences between these systems does not constitute a physiological barrier to these euryhaline species.…”

Section: Spatial Versus Temporal Dimensionsmentioning

confidence: 99%

Factoring scales of spatial and temporal variation in fish abundance in a subtropical estuary

Garcia¹,

Vieira²,

Winemiller³

et al. 2012

Mar. Ecol. Prog. Ser.

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We employed a new approach linking multivariate and time series analyses to identify common versus unique spatiotemporal components of abundance variation of marine spawning fishes recruiting into a subtropical Western Atlantic estuary. Based on a 10 yr standardized monthly data set, we also investigated patterns of association for local and regional factors with annual and inter-annual variation in abundance of 5 dominant marine estuarine-dependent fishes. The total amount of variation in fish abundance explained by environmental variables was 22.4%. After factoring out shared spatiotemporal variation (0.8%), our analysis showed that temporal components had an almost 5-fold greater contribution (28.0%) than spatial components (6.4%) in explaining the variation in abundance of the 5 species. Most of the variation across the temporal scale (58.5%) was associated with annual (from 0.5 to 1.3 yr) rather than multi-year oscillations (> 2 yr). Such annual patterns were probably associated with adaptations of marine estuarine-dependent fishes for exploiting predictable pulses in seasonal productivity typically found in subtropical estuaries. In contrast, inter-annual variation in abundance occurring at a scale of 3 to 7 yr could be attributed to rainfall anomalies associated with El Niño Southern Oscillation (ENSO) events, whereas those occurring at a scale of 2 yr could be influenced by the Southern Annular Mode (SAM). Our findings corroborate the hypothesis that prevalent annual patterns of variation in the abundance of marine estuarine-dependent fishes are associated with predictable productivity pulses linked to the annual temperature regime, whereas inter-annual variations in fish abundance are associated with the influence of large-scale climatic phenomena.

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“…The seasonal variation in salinity is more important for primary marine or primary freshwater species than for estuarine species, because the latter display higher osmoregulatory efficiency and can better cope with this environmental variation (Becker et al 2011;Marshall 2012;Park et al 2020). Consequently, the abundance of estuarine fishes tends to be stable between seasons, while abundance of marine and freshwater fishes is higher in the season when salinity levels are lower (rainy season) or higher (dry season), respectively, as corroborated by our GAM results.…”

Section: Discussionmentioning

confidence: 99%

The bycatch of piramutaba, Brachyplatystoma vaillantii industrial fishing in a salinity and depth gradient in the Amazon estuary, Brazil

et al. 2023

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The piramutaba, Brachyplatystoma vaillantii is a freshwater catfish that is the most abundant fishery resource in the Amazon estuary. Piramutaba trawling is done on industrial fishing scale and is characterized by the presence of many freshwater and marine bycatch species, with and without commercial value. Here we describe the bycatch of the industrial fishery of piramutaba in the Amazon estuary and evaluate the relationship of two important environmental factors, depth and salinity, with the accidental capture of freshwater and marine fishes in the Amazon estuary in the rainy and dry seasons. We identified 21 cartilaginous fish species (19.1% freshwater and 80.9% marine) and 125 bony fish species (25.6% freshwater and 74.4% marine). The bycatch included 64 species without commercial value (43% of all bycatch species), which are always discarded. Freshwater and estuarine fishes exhibited significantly higher abundances in shallower environments, while marine fishes were similarly abundant along the entire depth gradient. On the contrary, the abundance of freshwater fishes significantly decreased, and that of estuarine and marine fishes significantly increased with increasing salinity. Regarding the conservation status of the bycatch species, one is classified as vulnerable (VU), and seven as critically endangered (CR). The information on the bycatch of piramutaba fishery in the Amazon estuary is important to subsidize regional fisheries policies and the management of protected areas.

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Plasma ion levels of freshwater and marine/estuarine teleosts from Southern Brazil

Cited by 7 publications

References 29 publications

Anesthesia and transport of fat snook Centropomus parallelus with the essential oil of Nectandra megapotamica(Spreng.) Mez

Anesthesia and transport of fat snook Centropomus parallelus with the essential oil of Nectandra megapotamica(Spreng.) Mez

Factoring scales of spatial and temporal variation in fish abundance in a subtropical estuary

The bycatch of piramutaba, Brachyplatystoma vaillantii industrial fishing in a salinity and depth gradient in the Amazon estuary, Brazil

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