Biofilm reactors are of major importance in a world with limited resources. Whereas they are applied in certain areas already, there is still a necessity for extending the fields of application and improving the biofilm formation process itself. In our attempts to improve the biofilm formation for productive bacteria (here the gram-negative seawater bacterium Paracoccus seriniphilus), we focus on the attachment of single bacteria to a solid surface as the first step of the biofilm formation process. Beside adhesion forces and elasticity of the bacteria, we investigate the minimal detachment forces due to lateral shear forces.