The damselfish Neopomacentrus cyanomos were collected twice under an oil-loading platform 1.5 km from the Cayo Arcas reef (20.21°N, −91.98°W), in August 2016 (n = 16) and August 2017 (n = 30). All fish sampled in August 2016 were submitted to an acute-thermal-decline protocol (−4 °C over a period of 1 h, and maintaining the temperature for 23 h), while the ones collected in August were acclimated 45 days at 18, 20, 22, and 26 °C. Finally, half of the acclimated fish were submitted to a high temperature challenge to assess the effect of cold thermal acclimation on heat tolerance scope. Data of routine metabolic rates, blood metabolites and biochemical stress indicators from each fish are provided in this data set.

Version 2 (2020-01-09):- Remove parameters: Triglycerides; Cholesterol; RedOx potential; Metabolic rate of oxygen per wet mass, high-Change title: previously "Measurements of respiratory metabolism, metabolites (in blood), and cellular stress markers (in muscle) of invasive damselfish Neopomacentrus cyanomos, after acute decreasing changes of temperature; and after 45-days acclimation at colder regimes"