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We present the study of a magnitude limited sample (mB < 16.6 mag) of 13 latetype galaxies (LTGs), observed inside the virial radius, Rvir 0.7 Mpc, of theFornax cluster within the Fornax Deep Survey (FDS). The main objective is touse surface brightness (SB) profiles and g-i colour maps to obtain informationon the internal structure of these galaxies and find signatures of themechanisms that drive their evolution in high-density environment, which isinside the virial radius of the cluster. By modelling galaxy isophotes, weextract the azimuthally averaged surface brightness profiles in four opticalbands. We also derive g-i colour profiles, and structural parameters like totalmagnitude and effective radius. For 10 of the galaxies in this sample, weobserve a clear discontinuity in their SB profiles, derive their break radius(Br), and classify their disc-breaks into Type-II (down-bending) or Type-III(up-bending). We find that Type-II galaxies have bluer average (g-i) colour intheir outer discs while Type-III galaxies are redder. Br increases with stellarmass and molecular gas mass while decreases with molecular gas-fractions. Theinner and outer scale-lengths increase monotonically with absolute magnitude,as found in other works. In Fornax, galaxies with morphological type 5< T< 9(~60 % of the sample) are located beyond the high-density, ETG-dominatedregions, but no correlation found between T and the disc-break type. The mainresults of this work suggest that the disc-breaks of LTGs inside the virialradius of the Fornax cluster seem to have arisen through a variety ofmechanisms, which is evident in their outer-disc colours and the absence ofmolecular gas beyond their break radius in some cases. This can result in avariety of stellar populations inside and outside the break radii.

The Fornax Deep Survey with VST. VII. Evolution and Structure of Late Type Galaxies inside the Virial Radius of the Fornax Cluster