  We present results of a cosmological hydrodynamical study of gravitational
accretion in cosmic string wakes and filaments. Cosmic string wakes are formed
by fast moving (v ~ c) strings. A conical deficit angle in the string spacetime
induces a velocity perturbation in the background matter and a two-dimensional
wake accretes in the path of the string. Filaments are formed by slow moving
strings with a large amount of small scale structure. The major gravitational
perturbation from slow moving strings is due to the Newtonian field induced by
the effective mass of the wiggles. In cosmic string wakes, cool streams of
baryons collide and are trapped at the center of the wake causing an
enhancement of baryons versus dark matter by a factor of 2.4. In filaments, a
high pressure is induced at the filament core and baryonic matter is expelled
leading to a baryon deficit in the center of the filament.
