The Oceanographic Centre of Canary Islands (IEO-CSIC) runs a Marine Aquaculture Facility from 1980. Since its establishment, it has been expanded and upgraded several times to adapt to latest advancements and research needs. As part of these reasearch and development activities carried out, daily measurements of water tank temperature are performed. This time series shows the annual variability as well as other signals. After verification, documented quality control by quality flags, and formatting in the MEDAR/Medatlas format, the monthly files (feb 1992 to dec 1998) are generated according to the standard vocabularies of SeaDataNet.