Environmental salinity-modified osmoregulatory response in the sub-Antarctic notothenioid fish Eleginops maclovinus

Vargas‐Chacoff, Luis; Moneva, F.; Oyarzún, R.; Martínez, D.; Muñoz, José Luis Pedraz; Bertrán, Carlos; Mancera, Juan Miguel

doi:10.1007/s00300-014-1515-9

Cited by 32 publications

(24 citation statements)

References 47 publications

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“…This result is not in agreement with the general idea of the ''isosmotic hypothesis'' (Jobling 1994) that when euryhaline species are held in media that are isosmotic with their body fluids, their metabolic rates are lower than those individuals held in either fresh water or seawater. Our oxygen consumption results did not show energetic evidence of the Vargas-Chacoff et al (2014) findings, although these authors calculated an iosmotic salinity (11 psu) very near to the one used by us (12 psu). They described, with decreasing salinities under chronic conditions, an increased concentration of cortisol, lactate and protein, and an elevated Na ?…”

Section: Discussioncontrasting

confidence: 41%

“…Of the three sectors of an estuary defined by Fairbridge (1980), marine or lower estuary, middle estuary and upper or fluvial estuary, juveniles of E. maclovinus clearly select the intermediate salinity zone of Lapataia estuarine complex, characterized by a high mixture of fresh water and seawater. This idea is clearly supported by the findings of Vargas-Chacoff et al (2014) about the timecourse changes of plasma osmolality after osmotic challenge, that indicate a better capacity of E. maclovinus to acclimatize to lower rather than to higher environmental salinities.…”

Section: Discussionmentioning

confidence: 51%

“…There is little information about how the metabolic rate is affected by salinity, even in routine postabsorptive and absorptive conditions. Vargas-Chacoff et al (2014) describe that in E. maclovinus, acclimation to different salinities induced changes in plasma metabolites (glucose, lactate and proteins), cortisol and Na ? K ?…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of changes in salinity on oxygen and food consumption of the young sub-Antarctic notothenioid Eleginops maclovinus: possible implications of their use of an estuarine habitat

et al. 2016

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Salinity is one of the most important structuring factors in the distribution and bioenergetics of estuarine fishes. The aims of this work were to study the distribution of the sub-Antarctic, eurythermic, euryhaline and coastal notothenioid Eleginops maclovinus in Lapataia estuary (Tierra del Fuego National Park), in relation to salinity conditions, and the effect of salinity on the oxygen consumption of this species. The spread of the mixing zone of Lapataia was studied and physicochemical properties (conductivity, pH, temperature and salinity) were measured. Distribution of E. maclovinus juveniles was investigated principally by electrofishing in the field. Oxygen consumption of absorptive and post-absorptive young-ofthe-year individuals (8-10 cm total length) was analyzed by stop-flow respirometry measurements, performed at three salinities (1, 12 and 30 psu). The intermediate mixing zone is relatively small in this system, showing an extension of *1.5 km upstream from Lapataia Bay. It was found that there was a strong relationship between the mixing zone and the distribution of juveniles of E. maclovinus. No differences were found in the metabolic baseline at different salinities. A punctual feeding provoked a typical SDA response, with a significant higher ingested food and metabolic scope at intermediate salinity (12 psu). An increased scope was reached by increasing the energy intake and not through a decrease in the standard metabolic rate. Under an available food condition, this capacity could result in an increased growth rate at intermediate salinity.

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Section: Discussioncontrasting

confidence: 41%

Section: Discussionmentioning

confidence: 51%

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Effects of changes in salinity on oxygen and food consumption of the young sub-Antarctic notothenioid Eleginops maclovinus: possible implications of their use of an estuarine habitat

et al. 2016

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“…Fish were acclimated for four weeks to seawater (32 psu, 1085 mOsm kg −1 ) in 500 L, flow-through system ponds at a stocking density of 3.1 kg m −3 and under natural photoperiod and temperature (12 ± 0.5 • C) conditions, per methodology described by Vargas-Chacoff et al [19]. Fish were fed using commercial Nutreco Defense 100 dry pellets (Skretting, Stavanger, Norway) containing 48% protein, 22% fat, 13.5% carbohydrates, 8% humidity, and 8.5% ash.…”

Section: Animal Specimensmentioning

confidence: 99%

Head Kidney Transcriptome Analysis and Characterization for the Sub-Antarctic Notothenioid Fish Eleginops maclovinus

Martínez

Pontigo

Morera

et al. 2018

Fishes

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This study describes de novo transcriptome sequencing and annotation analyses for the head kidney of the sub-Antarctic notothenioid fish Eleginops maclovinus, a sister group of the Antarctic notothenioid fish clade. Moreover, E. maclovinus is one of the most eurythermal and euryhaline representatives of the Notothenioidei suborder. RNA-seq data were generated by the 454 GS Junior system, resulting in 11,207 contigs that were then assembled by the Genomic Workbench CLC software. The transcriptome was annotated by BLASTing each sequence against the universal, non-redundant NCBI database (National Center for Biotechnology Information) using the AUSTRAL-omics computer cluster. A significant number of transcripts related to innate and adaptive immunity were found in the sequences, which could be used as references in future immunological studies in E. maclovinus.

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“…After infection occurs, the stress produced by the bacterial infection makes the fish reallocate energy to maintain the homoeostasis, moving away from investment activities such as growth and reproduction, towards activities like locomotion, hydromineral regulation and tissue repair, reducing the performance capacity and the immunological response during chronic stress (Schreck, ; Vargas‐Chacoff, Moneva, et al, , ; Wendelaar‐Bonga, ). The stress associated with bacterial infections increases the cortisol levels, a glucocorticoid indicator of stress in fish, causing a decrease in lymphocyte numbers, suppression of phagocytes and complement activity, and the modulation of enzymes involved in the metabolism of carbohydrates, lipids and amino acids (Law, Chen, Song, Dufour, & Chang, ; Librán‐Pérez, Costa, Figueras, & Novoa, ; Oyarzún, Vargas‐Lagos, et al, ; Pickering & Stewart, ; Vargas‐Chacoff, Moneva, et al, ; Vargas‐Chacoff, Ortiz, et al, ; Wendelaar‐Bonga, ). Moreover, fish infected with pathogens like P. salmonis can experience variations in plasma glucose levels, total amino acids, lactate and triglycerides to satisfy a greater energy demand caused by chronic infections (Miwa & Mano, ; Peng, Ma, Zhang, & Li, ; Peters, Faisal, Lang, & Ahmed, ; Vargas‐Chacoff, Ortiz, et al, ).…”

Section: Introductionmentioning

confidence: 99%

Intermediary metabolic response and gene transcription modulation on the Sub‐Antarctic notothenioid Eleginops maclovinus (Valenciennes, 1930) injected with two strains of Piscirickettsia salmonis

Soto‐Dávila

Martínez

Oyarzún

et al. 2019

Journal of Fish Diseases

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Pathogen interactions with cultured fish populations are well studied, but their effects on native fishes have not been characterized. In Chile, the disease caused by bacterial species Piscirickettsia salmonis represents one of the main issues and is considered to be one of the important pathogens in the field of aquaculture. They have been found to infect native fish. Therefore, it is necessary to understand the impact of P. salmonis on native species of local commercial value, as well as the potential impact associated with the emergence of antibiotic‐resistant strains of P. salmonis. Due to this purpose, the native fish Eleginops maclovinus was used in our study. Fish were randomly distributed in tanks and intraperitoneally inoculated with two strains of P. salmonis. No mortality was recorded during the experiment. Cortisol, glucose and total α‐amino acid levels increased in fish injected with AUSTRAL‐005 strain compared to sham‐injected and LF‐89‐inoculated fish. Moreover, results showed an increase in the activity of carbohydrates and lipids metabolism in liver; and an increase in the carbohydrates, lipids and total α‐amino acid metabolism in muscle after injection with AUSTRAL‐005. Our results suggest that P. salmonis modulates the physiology of E. maclovinus and the physiological impact increase in the presence of the antibiotic‐resistant strain AUSTRAL‐005.

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Environmental salinity-modified osmoregulatory response in the sub-Antarctic notothenioid fish Eleginops maclovinus

Cited by 32 publications

References 47 publications

Effects of changes in salinity on oxygen and food consumption of the young sub-Antarctic notothenioid Eleginops maclovinus: possible implications of their use of an estuarine habitat

Effects of changes in salinity on oxygen and food consumption of the young sub-Antarctic notothenioid Eleginops maclovinus: possible implications of their use of an estuarine habitat

Head Kidney Transcriptome Analysis and Characterization for the Sub-Antarctic Notothenioid Fish Eleginops maclovinus

Intermediary metabolic response and gene transcription modulation on the Sub‐Antarctic notothenioid Eleginops maclovinus (Valenciennes, 1930) injected with two strains of Piscirickettsia salmonis

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