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By the description due to Mukai and Iliev, a smooth prime Fano threefold X ofgenus 9 is associated to a surface P(V), ruled over a smooth plane quarticGamma. We use Kuznetsov's integral functor to study rank-2 stable sheaves on Xwith odd determinant. For each c_2 \geq 7, we prove that a component of theirmoduli space M_X(2,1,c_2) is birational to a Brill-Noether locus of bundles onGamma having enough sections when twisted by V. Moreover we prove thatM_X(2,1,7) is isomorphic to the blowing-up of the Picard variety Pic^2(Gamma)along the curve parametrizing lines contained in X.

Rank 2 stable sheaves with odd determinant on Fano threefolds of genus 9