  In this article we construct the Hamiltonian description of the closed vortex
filament dynamics in terms of non-standard variables, phase space and
constraints. The suggested approach makes obvious interpretation of considered
system as a quasiparticle that possess certain external and internal degrees of
the freedom. The constructed theory is invariant under the transformation of
Galilei group. The appearance of this group allows for a new viewpoint on the
energy of a closed vortex filament with zero thickness. The explicit formula
for the effective mass of the quasiparticle 'closed vortex filament' is
suggested.
