<![CDATA[Waduk Kedung Ombo merupakan waduk serbaguna dimanfaatkan sebagai irigasi persawahan, pembangkit tenaga listrik, sumber air minum, pariwisata, perikanan budidaya dan perikanan tangkap. Limbah aktivitas manusia tersebut akan mempengaruhi tingkat kesuburan perairan dan komunitas biota didalamnya. Penelitian ini bertujuan untuk mengetahui tingkat kesuburan perairan di waduk Kedung Ombo di lakukan dengan metode surve dari bulan Februari hingga Desember 2010. Contoh air untuk pengamatan parameter kesuburan yaitu suhu, kecerahan, oksigen, nitrogen total, fosfor total dan klorofil a diambil dari enam stasiun pada tiga kedalaman yaitu permukaan (0 m), 3 m, 5 m dan, dasar perairan. Tingkat kesuburan perairan ditentukan dengan pendekatan trophical index (trix). Hasil penelitian menunjukkan bahwa kualitas perairan waduk Kedung Ombo secara umum termasuk perairan eutrofik dengan nilai rata-rata yaitu: ’trix’ 5,5; kecerahan perairan 91 cm, klorofil 18.37 µg/l, total N=0,37 ppm; dan total P = 0,046 ppm. Kedung Ombo reservoir is a multipurpose reservoir used as irrigation, hydrolic power, sources of drinking water, tourism, fisheries. The trophic status of the reservoir can be affected by wastes from agricultural, human settlement and floating net cages fish culture. Inventory field survey in order to know the trophic state of Kedung Ombo reservoir was conducted from February to December 2010.. Water samples used to measure the trophic state such as water temperature, dissolved oxygen, total nitrogen, total phosphorus and chlorophyll a, were collected from 5 sampling sites at three depth; water surface (0 m), 3 m, 5 m and closed to surface sediment. The trophic state of Kedung Ombo Reservoir was estimated with Trix index. The results revealed that Kedung Ombo Reservoir was classified as eutrophic waters with trophic index (Trix index),transparency, chlorophyll a, total nitrogen and total phosphorus mean values were 5.5, 91 Cm, 18.37µg/l, 0,37 ppm,and 0.046 ppm respectively.]]>
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