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Exploiting the data from the GAs Stripping Phenomena in galaxies with MUSE(GASP) survey, we study the gas-phase metallicity scaling relations of a sampleof 29 cluster galaxies undergoing ram-pressure stripping and of a referencesample of (16 cluster and 16 field) galaxies with no significant signs of gasdisturbance. We adopt the PYQZ code to infer the mean gas metallicity at theeffective radius and achieve a well-defined mass-metallicity relation (MZR) inthe stellar mass range $10^{9.25}\le M_\star \le 10^{11.5}\,{\rm M_\odot}$ witha scatter of 0.12 dex. At any given mass, reference cluster and strippinggalaxies have similar metallicities, while the field galaxies with $M_\star <10^{10.25}\,{\rm M_\odot}$ show on average lower gas metallicity than galaxiesin clusters. Our results indicate that at the effective radius the chemicalproperties of the stripping galaxies are independent of the ram-pressurestripping mechanism. Nonetheless, at the lowest masses we detect 4 strippinggalaxies well above the common MZR that suggest a more complex scenario.Overall, we find signs of an anti-correlation between the metallicity and boththe star formation rate and the galaxy size, in agreement with previousstudies. No significant trends are instead found with the halo mass,clustercentric distance and local galaxy density in clusters. In conclusion, weadvise a more detailed analysis of the spatially resolved gas metallicity mapsof the galaxies, able to highlight effects of gas redistribution inside thedisk due to the ram-pressure stripping.

GASP XXVII: Gas-phase metallicity scaling relations in disk galaxies with and without ram-pressure stripping