  We study the finite temperature Casimir interactions on two parallel
boundaries in the anti-de Sitter spacetime AdS$_{D+1}$ induced by the vacuum
fluctuations of a massive fermionic field with MIT bag boundary conditions. As
in the Minkowski spacetime, the Casimir interaction always tends to attract the
two boundaries to each other at any temperature and for any mass. For bosonic
fields, it is well known that the high temperature leading term of the Casimir
interaction is linear in temperature. However, for fermionic fields, the
Casimir interaction decays exponentially at high temperature due to the absence
of zero Matsubara frequency.
