  The purpose of the paper is twofold. Firstly, we want to present a Meta
Theorem to show the existence of a martingale solution for coupled systems of
non-linear stochastic differential equations. The idea is first to split the
system by rewriting the non-linear part in a linear part acting on a given
process $\xi$. This is done in such a way that the fixpoint with respect to
$\xi$ would be the solution. However, to show the well posedness of the {\sl
linearized} system, one needs a cut-off argument. Under which conditions one
can handle the limits of the cut-off parameter to get in the end a martingale
solution of the original system is given in the Meta-Theorem.
  Secondly, we want to verify the full applicability of the Meta Theorem by
showing the existence of a martingale solution of a highly nonlinear chemotaxis
system with underlying fluid dynamic.
