  We give a new combinatorial model for the crystals of integrable highest
weight modules over the classical Lie algebras of type $B$ and $C$ in terms of
classical Young tableux. We then obtain a new description of its
Littlewood-Richardson rule and a maximal Levi branching rule in terms of
classical Littlewood-Richardson tableaux, which extends in a bijective way the
well-known stable formulas at large ranks. We also show that this tableau model
admits a natural superization and it produces the characters of irreducible
highest weight modules over orthosymplectic Lie superalgebras, which correspond
to the integrable highest weight modules over the classical Lie algebras of
type $B$ and $C$ under the Cheng-Lam-Wang's super duality.
