The Ministry of Agriculture, Nature, and Food Quality wants to achieve a 36% catch reduction of roach and bream for the gill net and seine fishery on the IJsselmeer and the Markermeer. This catch reduction should contribute to the preservation of the scaly-fish stocks of roach, bream, perch, and pike-perch. Ten measures were researched with the potential to contribute to the 36% catch reduction. The measures which can be implemented in the short term and which are easily enforceable are a 36% reduction of the current fishing effort and a closure of the fisheries during the period of 1 January to 15 March, or a shorter period within that time-span. Because the gill net fishery is a mixed fishery, no measure will lead to a proportional, effective impact for all four stocks. The abovementioned measures will lead to a loss of income which may be unevenly distributed among the fishermen.