In this study, the use of Visible Implant Elastomer (V.I.E.; Northwest Marine Technology Inc.) and Passive Integrated Transponder (P.I.T.; EiD Ibérica SA - TROVAN) tags in red porgy (Pagrus pagrus) were evaluated, as tag methods to know the genealogy under culture. For VIE tags, 0.5 and 2 g weight classes were tested, without any effect of the tag on growth. Tag was fragmented along experiments (3.06±0.17 fragments) but showed maximum retention. A significant mortality rate was detected on 0.5 g tagged fish, being 21.7% higher in tagged fish (P<0.05). At 2 g weight, there was not effect of the tag on mortality and visibility per colour decreased in the following order; red, rose, green,orange, yellow, white and blue. For PIT tags, 4 and 10 g weight classes were evaluated and showed high tag retention, 99%. In both weight classes, PIT tags did not show effect on fish growth while tags produced a significant effect on mortality, 24.4% at 4 g and 27% at 10 g (P<0,05). Within this last weight class, there was not difference in mortality between tagged and untagged fish with weight > 10 g.