The Osmo-respiratory Compromise in Fish: The Effects of Physiological State and the Environment

Sardella, Brian A.; Brauner, Colin J.

doi:10.1201/b11000-8

Cited by 26 publications

(33 citation statements)

References 1 publication

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“…Both VCB and ASR permit tilapia to limit exposure of the high surface area, high diffusion rate gills to an environmental stressor, which theoretically would also block or reduce exchange. This potentially limits either direct thermal flux or osmotic movement across the gill epithelium, at least for short durations, but certainly would have detrimental effects with respect to gas exchange (Sardella & Brauner, ). VCB is analogous to breath‐hold in air breathing animals, and as such, may result in hypoxemia and hypercapnia within the animal.…”

Section: Discussionmentioning

confidence: 99%

The effects of acclimation temperature, salinity, and behavior on the thermal tolerance of Mozambique tilapia (Oreochromis mossambicus)

King

Sardella

2017

J Exp Zool Pt A

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Mozambique tilapia have been shown to be incredibly stress tolerant with respect to environmental salinity, hypoxia, and ammonia concentrations. Temperature challenges to this species have shown that they have difficulty with cold acclimation. The purpose of this study was to measure the effects of acclimation temperature and salinity on the thermal tolerance of Mozambique tilapia as assessed by critical thermal maxima (CT) and critical thermal minima (CT). We also monitored fish behavior and quantified ventilation rate. To our knowledge, this study was the first to investigate upper and lower thermal tolerances, and the effect of environmental salinity in this physiologically impressive species. Using predictive regression analyses of the thermal limits, thermal tolerance polygons were constructed and total areas were calculated 678.9°C for freshwater (FW)-acclimated tilapia, and 739.4°C seawater (SW)-acclimated tilapia. During the thermal challenges, we observed two novel behaviors in response to thermal challenge, ventilation cessation behavior (VCB) and aquatic surface respiration (ASR), and we conclude that the use of these behaviors extended the thermal limits of these fish in both FW and two-thirds SW by limiting the exposure of the gill epithelium to the changing environment.

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Section: Discussionmentioning

confidence: 99%

The effects of acclimation temperature, salinity, and behavior on the thermal tolerance of Mozambique tilapia (Oreochromis mossambicus)

King

Sardella

2017

J Exp Zool Pt A

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“…Possible trade-offs with fish performance traits can include osmo-respiratory compromise in gill size, muscle fibre size, trait maintenance of energetic costs and gene expression modifications (Johnston et al 2005;Lorin-Nebel et al 2012;Sardella and Brauner 2007).…”

Section: Network Analysesmentioning

confidence: 99%

Contrasting tropical estuarine ecosystem functioning and stability: A comparative study

Villanueva

2015

Estuarine, Coastal and Shelf Science

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A comparative study of the Sine-saloum (Senegal) and Gambia (The Gambia) estuaries was performed based on trophic model outputs that describe the system structure and functioning. These trophic models were constructed such as to differentiate main energetic flows in the systems and express how climate change may have impacted ecosystem resilience to change. Estuarine fish assemblages are highly resilient despite exposure to vast hydrodynamic variations and stress. Coupled with strong anthropogenic-driven stresses such as fisheries and climate change, ecosystems may undergo severe regime shifts that may weaken their resilience and stability. Taxonomically related and morphologically similar species do not necessarily play similar ecological roles in these two ecosystems. Biomass and production in the Sine-saloum are concentrated at trophic levels (TLs) 2 and 3, while for the Gambia, both are concentrated at TL3. Higher TL biomasses in Gambia compared to Sine-Saloum may be explained by the latter ecosystem being characterized by inverse hypersalinity. Higher TL of production in Sine-Saloum is due to higher exploitations compared to Gambia where fishing activities are still less developed. High production and consumption rates of some groups in both ecosystems indicate high system productivity. Elevated productivity may be due to higher abundance of juvenile fishes in most groups that utilize the latter as refuge and/or nursery zones. Both ecosystems are phytoplankton-driven. Differences in group trophic and ecological roles are mainly due to adaptive responses of these species to seasonal and long-term climate and anthropogenic stressors. System indicators suggest different levels of ecosystem resilience and stability as a function of biodiversity. Relevance of other observations on ecosystem functioning and indicators in relation to perturbation is discussed.

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“…Traditionally, the osmorespiratory compromise in fish gills has been interpreted as the trade-off between low permeability, to limit unfavourable ion and water fluxes, and high permeability, to promote respiratory gas exchange (Randall et al, 1972;Nilsson, 1986;Sardella and Brauner, 2007). When one of these requirements increases (e.g.…”

Section: Introductionmentioning

confidence: 99%

The osmorespiratory compromise in the euryhaline killifish: water regulation during hypoxia

Wood

Ruhr

Schauer

et al. 2019

Journal of Experimental Biology

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Freshwater-and seawater-acclimated Fundulus heteroclitus were exposed to acute hypoxia (10% air saturation, 3 h), followed by normoxic recovery (3 h). In both salinities, ventilation increased and heart rate fell in the classic manner, while _ M O 2 initially declined by ∼50%, with partial restoration by 3 h of hypoxia, and no O 2 debt repayment during recovery. Gill paracellular permeability (measured with [ 14 C] PEG-4000) was 1.4-fold higher in seawater, and declined by 50% during hypoxia with post-exposure overshoot to 188%. A similar pattern with smaller changes occurred in freshwater. Drinking rate (also measured with [ 14 C] PEG-4000) was 8-fold higher in seawater fish, but declined by ∼90% during hypoxia in both groups, with post-exposure overshoots to ∼270%. Gill diffusive water flux (measured with 3 H 2 O) was 1.9-fold higher in freshwater fish, and exhibited a ∼35% decrease during hypoxia, which persisted throughout recovery, but was unchanged during hypoxia in seawater fish. Nevertheless, freshwater killifish gained mass while seawater fish lost mass during hypoxia, and these changes were not corrected during normoxic recovery. We conclude that this hypoxiatolerant teleost beneficially reduces gill water permeability in a salinity-dependent fashion during hypoxia, despite attempting to simultaneously improve _ M O 2 , but nevertheless incurs a net water balance penalty in both freshwater and seawater.

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The Osmo-respiratory Compromise in Fish: The Effects of Physiological State and the Environment

Cited by 26 publications

References 1 publication

The effects of acclimation temperature, salinity, and behavior on the thermal tolerance of Mozambique tilapia (Oreochromis mossambicus)

The effects of acclimation temperature, salinity, and behavior on the thermal tolerance of Mozambique tilapia (Oreochromis mossambicus)

Contrasting tropical estuarine ecosystem functioning and stability: A comparative study

The osmorespiratory compromise in the euryhaline killifish: water regulation during hypoxia

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