  A search for muon neutrinos originating from dark matter annihilations in the
Sun is performed using the data recorded by the ANTARES neutrino telescope from
2007 to 2012. In order to obtain the best possible sensitivities to dark matter
signals, an optimisation of the event selection criteria is performed taking
into account the background of atmospheric muons, atmospheric neutrinos and the
energy spectra of the expected neutrino signals. No significant excess over the
background is observed and $90\%$ C.L. upper limits on the neutrino flux, the
spin--dependent and spin--independent WIMP-nucleon cross--sections are derived
for WIMP masses ranging from $ \rm 50$ GeV to $\rm 5$ TeV for the annihilation
channels $\rm WIMP + WIMP \to b \bar b, W^+ W^-$ and $\rm \tau^+ \tau^-$.
