TROPHIC STATE INDEX (TSI) DI HABITAT RAJUNGAN (Portunus pelagicus Linnaeus, 1758) PANTAI BETAHWALANG, KABUPATEN DEMAK

Lulu Adilla Latifah, Norma Afiati, Pujiono Wahyu Purnomo

Abstract


Perairan Betahwalang di desa Betahwalang, Kecamatan Bonang, Kabupaten Demak merupakan perairan habitat rajungan (Portunus pelagicus Linnaeus, 1758) dengan intensitas penangkapan sepanjang tahun. Sebagai habitat rajungan, perairan Betahwalang direncanakan menjadi kawasan lindungan laut daerah yang dikelola masyarakat sekitarnya. Oleh karena itu, perlu dievaluasi status trofik perairannya dalam rangka pemanfaatan dan pengelolaan sumber daya hayatinya. Tujuan penelitian adalah untuk mengetahui status kesuburan perairan di habitat rajungan berdasarkan metode Trophic State Index (TSI) Carlson (1977) dan Kepmen LH No. 115/ 2003 tentang Pedoman Penentuan Status Mutu Air dan Kepmen LH No. 51/2004 tentang Baku Mutu Air Laut untuk Biota Laut. TSI Carlson menggunakan 3 komponen utama, yaitu total fosfor, klorofil a, dan kecerahan air untuk menduga status trofik perairan. Metode deskriptif dengan teknik penentuan lokasi sampling bersifat purposive random digunakan dalam penelitian ini. Hasil yang diperoleh dari analisis TSI Carlson (1977), berkisar antara 60-68, sementara skor status mutu air dari analisis Kepmen LH No.115/2003 tentang Pedoman Penentuan Status Mutu Air dan Kepmen LH No. 51/2004 tentang Baku Mutu Air Laut untuk Biota Laut adalah -20. Berdasarkan hasil penelitian dapat disimpulkan bahwa pantai Betahwalang berada pada status eutrofik sedang dan termasuk kategori perairan tercemar sedang untuk biota air laut.

 

Betahwalang aquatic water in Betahwalang village, Bonang district, Demak Regency, is a blue swimming crab (Portunus pelagicus Linnaeus, 1758) habitat with fishing intensity throughout the year. Accordingly, trophic status of the water in Betahwalang needs to be evaluated for sustainable management of the crab. The purpose of this study is to determine the fertility status of the water in blue swimming crab habitat based on Trophic State Index (TSI) Carlson (1977) and Decree of the Minister of Environment of The Republic Indonesia (Kepmen LH) No.115/2003 regarding Guideline for the Determination of Water Quality Status and Decree of the Minister of Environment of The Republic Indonesia (Kepmen LH) No.51/2004 regarding the Standard Quality of Sea Water for Marine Biota. TSI by Carlson (1977, 2005) applying three main components, i.e. total phosphorus, chlorophyll-a, and water transparency to assess trophic status of the water. Descriptive method is used in this study, for which sampling location was determined by using purposive random. The result from the analysis of TSI Carlson (1977) is among 60-68, while the score of water quality status analysed using Decree of the Minister of Environment of The Republic Indonesia (Kepmen LH) No.115/2003 about Guideline for the Determination of Water Quality Status and Decree of the Minister of Environment of The Republic Indonesia (Kepmen LH) No.51/2004 about the Standard Quality of Sea Water for Marine Biota is -20. Based on the results of this research, it is concluded that Betahwalang beach is on medium eutrophic status and categorized as medium polluted water for marine biota.


Keywords


Status Mutu Perairan; Trophic State Index (TSI) Carlson (1977); Kepmen LH No.115/2003; Kepmen LH No. 51/2004; Pantai Betahwalang

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