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http://dx.doi.org/10.47853/FAS.2021.e24

Acclimation temperature influences the critical thermal maxima (CTmax) of red-spotted grouper  

Rahman, Md Mofizur (Department of Marine Biology, Pukyong National University)
Lee, Young-Don (Marine Science Institute, Jeju National University)
Baek, Hea Ja (Department of Marine Biology, Pukyong National University)
Publication Information
Fisheries and Aquatic Sciences / v.24, no.7, 2021 , pp. 235-242 More about this Journal
Abstract
The present study investigated the critical thermal maxima (CTmax) of red-spotted grouper, Epinephelus akaara under different acclimation temperatures (Tacc). Fish were acclimated at 24℃, 28℃, and 32℃ water temperature for 2 weeks. Water temperature was increased at a rate of 1℃/h and CTmax level was measured following the critical thermal methodology (Paladino et al., 1980). The results showed that CTmax values of E. akaara were 35.61℃, 36.83℃, and 37.65℃ for fish acclimated at 24℃, 28℃, and 32℃, respectively. The acclimation response ratio (ARR) was 0.26. The CTmax values were significantly correlated with body size. Collectively, it is said that the CTmax value of red-spotted grouper can be affected by different adaptation temperature (24℃, 28℃, and 32℃) and the fish acclimated to a higher temperature has a higher CTmax level. Besides, the CTmax value of 35.61℃-37.65℃ indicating the upper thermal tolerance limit for E. akaara under different Tacc (24℃, 28℃, and 32℃). Understanding the thermal tolerance of E. akaara is of ecological importance in the conservation of this species.
Keywords
Red-spotted grouper; Epinephelus akaara; Acclimation temperature; Critical thermal maxima; Acclimation response ratio;
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