Table 2. Maximum (Ct_max ) and minimum (Ct_min) critical temperatures for loss of equilibrium in Magadi tilapia collected from South West Hot Springs (SWHS) or Fish Springs Lagoon (FSL).

	Ctmax (°C)	Ctmin (°C)
SWHS Magadi tilapia fielda	45.6 ± 0.1	17.6 ± 0.4
SWHS Magadi tilapia labb	43.7 ± 0.4	14.4 ± 0.1
FSL Magadi tilapia fielda	43.6 ± 0.5	13.2 ± 0.3
FSL Magadi tilapia labb	44.5 ± 0.0	12.4 ± 0.3
Sheepshead minnow labc	45.1 ± 0.1
Sheepshead minnow labd	44.2 ± 0.1	11.3 ± 0.2
Yucatan pupfish labe	45.3 ± 0.1
Common killifish labf	42.5 ± 0.2	9.6 ± 0.2

Values are means ± 1SEM for all fish, with N = 8 for Magadi tilapia. Comparisons are made to other fish species which previously held the record for the world’s most high temperature tolerant fish.

^aAlcolapia grahami Measurements made shortly after capture from 40–41 °C water for SWHS fish and from 33 °C water for FSL fish.

^bAlcolapia grahami Measurements made after the fish were held for 4 days at 33 °C in their respective waters in the laboratory.

^cCyprinodon variegatus variegatus Measurements made in the laboratory after fish were held for 30 days with a daily 5 °C thermoperiod ranging from 37–42 °C²⁷.

^dCyprinodon variegatus variegatus Measurements made in the laboratory after fish were held for 30 days at 38 °C²⁷.

^eCyprinodon artifrons Measurements made in the laboratory after fish were held for 8 days with a daily 15 °C thermoperiod ranging from 26–41 °C²⁸.

^fFundulus heteroclitus Measurements were made in the laboratory after fish were held for 21 days at 34 °C²⁹.