Drowned spawn way too often

drowned can and will spawn in every single 2 high water source around my house, sometimes having 10-15 sitting in a small underground lake. This is causing the spawn rates for all other mobs to drop significantly especially when you have 5-6 small lakes around your house. When I check these areas I can see a total anywhere from 5 to 45 drowned sitting there that I need to kill. Then the next night I have to do the same thing over again because nothing will spawn at night if I don't.