  We calculate the mean free path in a hot and dense nuclear environment for a
fermionic dark matter particle candidate in the $\sim$GeV mass range
interacting with nucleons via scalar and vector effective couplings. We focus
on the effects of density and temperature in the nuclear medium in order to
evaluate the importance of the final state blocking in the scattering process.
We discuss qualitatively possible implications for opacities in stellar nuclear
scenarios, where dark matter may be gravitationally accreted.
