  We study monotone and strictly monotone Hurwitz numbers from a bosonic Fock
space perspective. This yields to an interpretation in terms of tropical
geometry involving local multiplicities given by Gromov-Witten invariants.
Furthermore, this enables us to prove that a main result of
Cavalieri-Johnson-Markwig-Ranganathan is a actually a refinement of the
Gromov-Witten/Hurwitz correspondence by Okounkov-Pandharipande.
