  Yang-Baxter relations symmetric with respect to the ortho-symplectic
superalgebras are studied. We start from the formulation of graded algebras and
the linear superspace carrying the vector (fundamental) representation of the
ortho-symplectic supergroup. On this basis we study the analogy of the
Yang-Baxter operators considered earlier for the cases of orthogonal and
symplectic symmetries: the vector (fundamental) R matrix, the L operator
defining the Yangian algebra and its first and second order evaluations. We
investigate the condition for L(u) in the case of the truncated expansion in
inverse powers of u and give examples of Lie algebra representations obeying
these conditions. We construct the R operator intertwining two super-spinor
representations and study the fusion of L operators involving the tensor
product of such representations.
