Temperature and salinity tolerances of yellowfin sea bream, Acanthopagrus latus, at different salinity and temperature levels

C.-Y. Jian, S.-Y. Cheng, J.-C. Chen-2003

Aquaculture Research, 34(2): 175-186 

Abstract:

Yellowfin sea bream Acanthopagrus latus (Houttuyn) (0.98 ± 0.27 g) were examined for temperature and salinity tolerances at nine different environmental regimes (0.3, 15 and 33 ppt combined with 10, 25 and 32°C), in which the fish were subjected to gradual and sudden changes in temperature and salinity respectively. The 50% CTMax (critical thermal maximum) and the UILT (upper incipient lethal temperature) were in the range of 34.8-38.2°C and 32.8-36.4°C respectively. The 50% CTMin (critical thermal minimum) and the LILT (lower incipient lethal temperature) were in the ranges of 4.9-9.4°C and 7.1-17.6°C respectively. The 50% CSMax (critical salinity maximum) and the UILS (upper incipient lethal salinity) were in the ranges of 54-69 ppt and 9-44 ppt, respectively. The fish at lower temperature (10°C) and salinity of 33 ppt tolerated temperature as low as 6°C when the temperature was decreased gradually. The fish at 33 and 15 ppt and lower temperature (10°C) tolerated salinity as high as 66-67 ppt, whereas those at freshwater salinity level (0.3 ppt) and 32°C tolerated salinity to 50 ppt when salinity was increased gradually. The relationships among UILT, LILT, 50% CTMax, 50% CTMin, UILS, 50% CSMax, salinity and temperature are given.

(Department of Aquaculture, National Taiwan Ocean University, Keelug, Taiwan, 202, Republic of China. E-mail of Jiann-Chu Chen: jcchen@mail.ntou.edu.tw)

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