This work was supported by project AquaMMIn (MAR-02.01.01-FEAMP-0038), co- funded by Portugal 2020 and the European Union through Mar2020, the Operational Programme (OP) for the European Maritime and Fisheries Fund (EMFF) in Portugal. MT and MM acknowledge the research grants funded within AquaMMIn project (DBIO/BL-5/AQUAMMIN-2021). Thanks are also due for the financial support to CESAM (UIDP/50017/2020+UIDB/50017/2020), to FCT/MEC through Scientific Employment Stimulus ��� Individual Call 2018 (CEECIND/01250/2018 to DM) and PhD scholarship call 2021 (2021.04675.BD to JFF), and to the co-funding by the FEDER, within the PT2020 Partnership Agreement and Compete 2020.

Dataset on the upper thermal tolerance limits (Critical Thermal Maximum, CTmax) of male and female Palaemon varians shrimps collected from the salt pan complex of Marinha de Santiago da Fonte, Ria de Aveiro, Portugal (40 �� 37���44.5������N, 08 �� 39���37.3������W). Data on weight and lenght are also included. Temperature data for the sampling site were collected with a HOBO datalogger (water Temp Pro v2 U22-001, Onset, USA) and are also included. Dataset associated to the article https://doi.org/10.1016/j.jtherbio.2021.103151