Thermal tolerance, metabolic scope and performance of meagre, Argyrosomus regius, reared under high water temperatures

Stavrakidis-Zachou, Orestis; Lika, Konstadia; Pavlidis, M.; Tsalafouta, A.; Mohamed, Asaad H; Papandroulakis, Nikos

doi:10.1016/j.jtherbio.2021.103063

Cited by 8 publications

(6 citation statements)

References 72 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A control mechanism, such as DNA methylation, which has recently been demonstrated to change in response to thermal acclimation across sturgeon species ( Earhart et al ., unpublished data ; Bugg et al ., 2022 ; Penny et al ., 2023 ). The inverted-U response has also been observed in other species of fish, identified through reduced mRNA transcription in response to increasing temperature, signifying a reduction in cellular performance may be common among fishes undergoing thermal stress ( Jeffries et al ., 2018 ; Bugg et al ., 2020 , 2022 ; Mackey et al ., 2021 ; Stavrakidis-Zachou et al ., 2021 ). The reduction in transcriptional plasticity in response to acclimation to 21°C is likely playing a role in the reduced physiological performance also demonstrated by the larval sturgeon.…”

Section: Discussionmentioning

confidence: 99%

Identification of upper thermal thresholds during development in the endangered Nechako white sturgeon with management implications for a regulated river

Earhart

Blanchard

Morrison

et al. 2023

Conservation Physiology

View full text Add to dashboard Cite

Climate change-induced warming effects are already evident in river ecosystems, and projected increases in temperature will continue to amplify stress on fish communities. In addition, many rivers globally are impacted by dams, which have many negative effects on fishes by altering flow, blocking fish passage, and changing sediment composition. However, in some systems, dams present an opportunity to manage river temperature through regulated releases of cooler water. For example, there is a government mandate for Kenney dam operators in the Nechako river, British Columbia, Canada, to maintain river temperature <20°C in July and August to protect migrating sockeye salmon (Oncorhynchus nerka). However, there is another endangered fish species inhabiting the same river, Nechako white sturgeon (Acipenser transmontanus), and it is unclear if these current temperature regulations, or timing of the regulations, are suitable for spawning and developing sturgeon. In this study, we aimed to identify upper thermal thresholds in white sturgeon embryos and larvae to investigate if exposure to current river temperatures are playing a role in recruitment failure. We incubated embryos and yolk-sac larvae in three environmentally relevant temperatures (14, 18 and 21°C) throughout development to identify thermal thresholds across different levels of biological organization. Our results demonstrate upper thermal thresholds at 21°C across physiological measurements in embryo and yolk-sac larvae white sturgeon. Before hatch, both embryo survival and metabolic rate were reduced at 21°C. After hatch, sublethal consequences continued at 21°C because larval sturgeon had decreased thermal plasticity and a dampened transcriptional response during development. In recent years, the Nechako river has reached 21°C by the end of June, and at this temperature, a decrease in sturgeon performance is evident in most of the traits measured. As such, the thermal thresholds identified here suggest current temperature regulations may not be suitable for developing white sturgeon and future recruitment.

show abstract

Section: Discussionmentioning

confidence: 99%

Identification of upper thermal thresholds during development in the endangered Nechako white sturgeon with management implications for a regulated river

Earhart

Blanchard

Morrison

et al. 2023

Conservation Physiology

View full text Add to dashboard Cite

show abstract

“…The procedure is detailed in Marques et al (2018); Stavrakidis-Zachou et al (2019) and the AmP manual (http://www.debtheory.org/wiki) while all the data used for the current model parametrization as well information on the resulting goodness of fit are provided in the Supplementary Material. Apart from their importance for fish farming, the reason for using them to showcase this approach was the availability of data on acute thermal stress from previous trials (Stavrakidis-Zachou et al, 2021b;Stavrakidis-Zachou et al, 2022), which can provide means of evaluating its performance. Specifically, in those trials the CT max was determined at different acclimation temperatures within the 24 -33°C range.…”

Section: The E Sea Bass and Meagre Casementioning

confidence: 99%

“…Here, the protocol details of those experiments (acclimation temperature, weight of the fish, heating rate) were used as model input to simulate the challenge and evaluate whether, and to what extent the critical temperatures defined here bares resemblance to traditional measures such as the CT max . While for the details of the above CT max trials we refer to the original papers (Stavrakidis-Zachou et al, 2021b;Stavrakidis-Zachou et al, 2022), in brief, they were performed after a three month acclimation time at different temperatures for each species, during which period the fish were fed daily to satiation and allowed to grow. Specifically, at the time of CT max determination, E. seabass weight was 208, 217, and 128g for acclimation temperatures 24, 28, and 32°C while for meagre the respective values were 379 and 318g at 24 and 29°C.…”

Section: The E Sea Bass and Meagre Casementioning

confidence: 99%

A bioenergetics approach to modelling tolerance limits under acute thermal stress in farmed finfish

2023

Self Cite

View full text Add to dashboard Cite

Pinpointing thermal tolerance thresholds for commercially important species, such as aquaculture finfish, under acute and chronic thermal stress is becoming increasingly relevant in the context of climate change. While experimental research, traditionally quantified by the determination of the Critical Thermal Maximum (CTmax), offers valuable insights, it is necessary to further develop appropriate tools to provide predictions and shed light on the underlying mechanisms of thermal tolerance. Bioenergetic models have long been used to study the effects of temperature on fish metabolism under chronic, but rarely under acute, scales. In this study, we present a modelling approach based on the Dynamic Energy Budget (DEB) theory that describes the tolerance limits of fish under acute thermal stress in bioenergetics terms. It adopts the notion of an energy-dependent tolerance to stress and defines acute tolerance limits at the intersection of fundamental energy fluxes, namely those relating to the mobilization of energy and to maintenance costs. To showcase this approach, DEB models for two finfish, the European sea bass (Dicentrarchus labrax) and the meagre (Argyrosomus regius) were used to run acute thermal challenge simulations and study shifts in the critical temperature achieved by the fish. The results suggest that the model can adequately capture the general tolerance patterns observed experimentally for the two species as well as pinpoint the parameters that may influence them. In particular, the simulations showed a positive relation between acclimation temperature and tolerance while the opposite stands for the body size of the fish, with smaller fish achieving higher critical temperatures than their larger counterparts. Also, tolerance limits were affected by the state of internal reserves, with well-fed fish exhibiting higher values. Finally, the potential application of this modelling approach on higher taxonomic scales was evaluated, by running simulations on species belonging to major fish orders. The preliminary results suggest that the method can capture differences among groups that are consistent with literature, suggesting it may be a realistic mechanistic approach for studying thermal tolerance in ectotherms.

show abstract

“…In order to select appropriate sample size for the trial, an initial power analysis was conducted using the G � Power software (version 3.1.9.7) which indicated a number of 30 fish per tank as sufficient for detecting effects of medium magnitude (effect size, f = 0.25) at a power of 0.8. However, in anticipation of high temperature-related mortalities as found in previous work [51] as well as considering fish removals due to sampling the actual number of fish used in this study was doubled.…”

Section: Experimental Designmentioning

confidence: 99%

Metabolic scope, performance and tolerance of juvenile European sea bass Dicentrarchus labrax upon acclimation to high temperatures

et al. 2022

Self Cite

View full text Add to dashboard Cite

European sea bass is a species of great commercial value for fisheries and aquaculture. Rising temperatures may jeopardize the performance and survival of the species across its distribution and farming range, making the investigation of its thermal responses highly relevant. In this article, the metabolic scope, performance, and tolerance of juvenile E. sea bass reared under three high water temperatures (24, 28, 33°C), for a period of three months was evaluated via analysis of selected growth performance and physiological indicators. Effects on molecular, hormonal, and biochemical variables were analyzed along with effects of acclimation temperature on the metabolic rate and Critical Thermal maximum (CTmax). Despite signs of thermal stress at 28°C indicated by high plasma cortisol and lactate levels as well as the upregulation of genes coding for Heat Shock Proteins (HSP), E. sea bass can maintain high performance at that temperature which is encouraging for the species culture in the context of a warming ocean. Critical survivability thresholds appear sharply close to 33°C, where the aerobic capacity declines and the overall performance diminishes. European sea bass demonstrates appreciable capacity to cope with acute thermal stress exhibiting CTmax as high as 40°C for fish acclimated at high temperatures, which may indicate resilience to future heatwaves events.

show abstract

Thermal tolerance, metabolic scope and performance of meagre, Argyrosomus regius, reared under high water temperatures

Cited by 8 publications

References 72 publications

Identification of upper thermal thresholds during development in the endangered Nechako white sturgeon with management implications for a regulated river

Identification of upper thermal thresholds during development in the endangered Nechako white sturgeon with management implications for a regulated river

A bioenergetics approach to modelling tolerance limits under acute thermal stress in farmed finfish

Metabolic scope, performance and tolerance of juvenile European sea bass Dicentrarchus labrax upon acclimation to high temperatures

Contact Info

Product

Resources

About