The area of Kizhi island differs from most of other parts of Onega Lake. It is characterized by numerous small islands, which reduce the water flow, and relatively shallow and uneven lake bottom. Whereas the average depth of the lake is 31 meters, the depth is about 2–3 meters in the Kizhi and only in some places reaches 16–20 meters. Because of the weak flows and shallow depth, water is relatively warm and quiet that promotes growth of aquatic vegetation. Fish types include roach, some gobies, crucian carp, sabre carp, perch, ruffe, pike, common dace, silver bream, ide, gudgeon, carp bream, spined loach, European smelt, char, pike-perch, rudd and burbot.