| Summary: | 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°C,
28°C, and 32°C water temperature for 2 weeks. Water temperature
was increased at a rate of 1°C/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°C, 36.83°C, and
37.65°C for fish acclimated at 24°C, 28°C, and 32°C,
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°C, 28°C,
and 32°C) and the fish acclimated to a higher temperature has a higher
CTmax level. Besides, the CTmax value of
35.61°C−37.65°C indicating the upper thermal tolerance
limit for E. akaara under different Tacc
(24°C, 28°C, and 32°C). Understanding the thermal tolerance
of E. akaara is of ecological importance in the conservation of
this species.
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