Thermal tolerance and preference of the Indian catfish Heteropneustes fossilis

Vasal, Sudhir; Sundararaj, Bangalore I.

doi:10.1007/bf00001458

Cited by 12 publications

(2 citation statements)

References 21 publications

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“…For instance, salmonids (Salmoniformes) which are cold water species were found to have lower thermal tolerance than other fish groups and this is consistently reported in literature (Anttila et al, 2013;Chen et al, 2015;Hines et al, 2019). On the other hand, the catfish (Siluriformes) which are known to have high thermal tolerance with typically reported CT max values in the range of 30 -45 ο C (Vasal and Sundararaj, 1978;Debnath et al, 2006;Dalvi et al, 2009;Stewart and Allen, 2014) scored the highest in our analysis. In addition, our simulations suggest a negative correlation of thermal tolerance with the species ultimate size, which has also been reported for different species of salmonids (Hines et al, 2019).…”

Section: B a Figuresupporting

confidence: 75%

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

2023

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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.

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Section: B a Figuresupporting

confidence: 75%

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

2023

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“…Culture practices of Clarias batrachus and Heteropneustes fossilis have been popularized widely. Studies on thermal tolerance of catfishes native to India are reported for H. fossilis (Vasal and Sundararaj, 1978) and Pangasius pangasius (Debnathet al, 2006). However, expansion of aquaculture, by introducing new fish species is gaining incentive due to the wide agro-climatic conditions of India and to keep leap with the mounting demand for fish protein.…”

Section: Introductionmentioning

confidence: 99%