  We study the invisible Majorana fermions of $\chi$ in bottomed baryon decays
with flavor-changing neutral currents (FCNCs) based on the model-independent
effective Lagrangian between the quarks and invisible particles. From the
bounds of the coupling constants extracted from the experiments, we examine the
decay branching ratios of $\Lambda_b\to\Lambda\chi\chi$,
$\Xi_b^{0(-)}\to\Xi^{0(-)}\chi\chi$, $\Lambda_b\to n \chi\chi$, $\Xi_b^{-}\to
\Sigma^{-} \chi\chi$, $\Xi_b^{0}\to \Sigma^{0} \chi\chi$, and $\Xi_b^{0}\to
\Lambda \chi\chi$, which can be as large as $6.3,~9.2,~5.7,~5.8,~2.7$, and
$1.0\times10^{-5}$ for $m_\chi=2$ GeV, respectively. Some of these decays are
accessible to the future experimental searches, such as Belle II.
