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

백혜자|Md Mofizur Rahman|이영돈
한국수산과학회 (The Korean Society of Fisheries and Aquatic Science)|2021.07|Fisheries and Aquatic Sciences|제24권 제7호|pp. 235-242

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참고문헌

키워드

Epinephelus akaaraRed-spotted grouperAcclimation temperatureCritical thermal maximaAcclimation response ratio
주제분류수산학

초록

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.

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.

참고문헌 (29)

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