Kooiman provides many services to mussel ships for Zeeland fishermen. To strengthen these activities, Scheepswerf Van Os Yerseke BV was acquired in 1995. Scheepswerf Van Os Yerseke BV also has a long history and was founded in 1885. Here, repairs, maintenance and renovations are mainly carried out on the fishing fleet. Van Os has been called Scheepswerf Kooiman Van Os BV since 2016.