Abstract
The purpose of this study was to determine the quality of waters, community structure of phytoplankton and zooplankton around the fishponds waters of Gerokgak Subdistrict. This research was conducted for 2 months, from May to June 2019. There were three sampling locations, namely in Gerokgak, Patas and Sumberkima Villages. The research method used was field research using quantitative analysis of phytoplankton biological indice. The waters condition around the Gerokgak Subdistrict waters was rather polluted, except for the around Sumberkima Village waters. The quality of the waters of Sumberkima Village was better than that of Gerokgak Village and Patas Village waters. Plankton abundance in the waters of Sumberkima Village was slightly low. The highest abundance of plankton in the waters of Patas Village and the lowest in Gerokgak Village waters. The dominant type of plankton was Cyanophyceae (blue-green algae).
 Keywords: water quality; plankton; species; abundance.
Highlights
The purpose of this study was to determine the quality of waters, community structure of phytoplankton and zooplankton around the fishponds waters of Gerokgak Subdistrict
This research was conducted for 2 months, from May to June 2019
The waters condition around the Gerokgak Subdistrict waters was rather polluted, except for the around Sumberkima Village waters
Summary
Kecamatan Gerokgak merupakan salah satu Kecamatan yang berada di Kabupaten Buleleng yang mengembangkan budidaya ikan dengan karamba jaring apung, budidaya mutiara, tambak udang dan bandeng, budidaya rumput laut, budidaya mina padi, pembenihan serta penangkapan ikan. Potensi perikanan pembudidaya di Kecamatan Gerokgak mengalami perkembangan khususnya pembudidaya ikan dalam keramba jaring apung baik kerapu maupun kakap putih dengan luas potensi yang dimanfaatkan sebesar 66,92 Ha, Luas potensi yang dimanfaatkan untuk budidaya mutiara 110,9 Ha. Potensi kegiatan pembenihan dan pembesaran ikan bandeng dan kerapu sangat penting sebagai sumber kehidupan masyarakat, maka sehingga diperlukan usaha-usaha mengkaji kelayakan lingkungan agar mencapai budidaya perikanan yang berkelanjutan. Kegiatan perikanan di Kecamatan Gerokgak yang dilakukan oleh masyarakat adalah tambak udang vanname, pengembangan ikan kerapu cantang, pengembangan nener, dan usaha perikanan yang ada di Kecamatan Gerokgak. Penelitian tentang lingkungan perairan pantai dilokasi tambak perikanan perlu dilakukan
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