Kualitas Air dan Indeks Pencemaran Danau Galela

*Tri Retnaningsih Soeprobowati  -  Universities Diponegoro, Indonesia
Hendro Christi Suhry  -  Departement Biologi, Fakultas Sains dan Matematika, Universitas Diponegoro
Tyas Rini Saraswati  -  Sekolah Pascasarjana, Universitas Diponegoro
Jumari Jumari  -  Sekolah Pascasarjana, Universitas Diponegoro
Received: 27 Dec 2019; Published: 31 Aug 2020.
Open Access
Citation Format:
Abstract

Danau Galela adalah salah satu sumberdaya perairan tawar terbesar di Provinsi Maluku Utara. Seiring dengan pertambahan jumlah penduduk, Danau Galela mengalami permasalahan seperti penurunan kualitas air akibat meningkatnya sistem budidaya ikan dengan menggunakan keramba, perikanan tangkap dan objek wisata. Aktifitas yang dilakukan di badan air maupun daratan perlahan berpengaruh terhadap ekosistem danau. penelitian ini bertujuan untuk mengetahui kualitas air dan status pencemaran danau galela, berdasarkan parameter fisika, kimia dan biologi (Kelimpahan fitoplankton). Metode pengambilan sampel dilakukan dengan menggunakan purposive sampling. Sampel fitoplankton diambil dengan metode stratifikasi secara vertikal setiap 1m. selanjutnya data di analisis kelimpahan dan komposisi fitoplankton untuk menentukan indeks saprobic dan indeks pencemaran. Berdasaarkan hasil analisis kandungan Kadar fosfor, nitrit dan amonia pada beberapa stasiun melewati baku mutu perairan kelas I dan II. Komposisi fitoplankton di Danau Galela terdiri atas Chlorophyta 15 spesies, Bacillariophyta 10 spesies, Cyanophyta 4 spesies, Euglenophyta dan Pyrrhophyta 1 spesies. Berdasarkan kelimpahan fitoplankton diketahui bahwa perairan Danau Galela berkisar antara 10.089 ind/l hingga 32.108 ind/l, termasuk kategori mesoeutrofik hingga eutrofik. Indeks saprobik berkisar pada β Mesosaprobik hingga α Mesosaprobik, sementara indeks pencemaran menunjukan memenuhi baku mutu hingga cemar ringan.

Keywords: Kualitas air, Pencemaran, Fitoplankton, Mesosaprobik

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