Branching rules for modular fundamental representations of symplectic   groups
  In this paper branching rules for the fundamental representations of the symplectic groups in positive characteristic are found. The submodule structure of the restrictions of the fundamental modules for the group $Sp_{2n}(K)$ to the naturally embedded subgroup $Sp_{2n-2}(K)$ is determined. As a corollary, inductive systems of fundamental representations for $Sp_{\infty}(K)$ are classified. The submodule structure of the fundamental Weyl modules is refined. 
A. Baranov (Inst. Math., Natl. Acad. Sci. Belarus), I.Suprunenko (the   same)