  This work aims to study the dislocation or nodal lines of 3D Berry's random
wave model. Their expected length is computed both in the isotropic and
anisotropic cases, being them compared. Afterwards, in the isotropic case the
asymptotic variance and distribution of the length are obtained as the domain
grows to the whole space. Under some integrability condition on the covariance
function, a central limit theorem is established. The study includes the
Berry's monochromatic random waves, the Bargmann-Fock model and the Black-Body
radiation as well as a power law model that exhibits an unusual asymptotic
behaviour and yields a non-central limit theorem.
