  Using the publicly available Quijote simulations, we present the first
measurements of the assembly bias of dark matter halos in N-body simulations
which include massive neutrinos. We focus on the dependence of the linear bias
$b_1$ on three halo properties: 1) concentration $c$, 2) spin $\lambda$, and 3)
ellipticity $s$. Although these simulations cover a large volume, superior to
any future surveys, we do not detect any effect of neutrinos on the relations
$b_1(c)$, $b_1(\lambda)$ and $b_1(s)$ at fixed halo mass. We further study the
dependence of halo properties and environment on neutrinos, finding these
quantities to be impacted by neutrino masses at the same level as assembly
bias. We find that the effect of neutrinos on spin and shape can be largely
attributed to the change in the cold dark matter $\sigma_8$ in neutrinos
simulations, which is not the case for concentration.
