PERTUMBUHAN IKAN BETOK (Anabas testudineus Bloch) DI BERBAGAI HABITAT DI LINGKUNGAN DANAU MELINTANG - KALIMANTAN TIMUR

Abstract

Tujuan dari penelitian ini adalah untuk mengetahui pertumbuhan ikan betok di berbagai habitat di lingkungan Danau Melintang Kalimantan Timur. Penelitian ini dilakukan dengan metode survei selama musim penghujan, yaitu bulan November 2007 hingga Januari 2008. Stasiun pengamatan ditetapkan secara sengaja di perairan danau, sungai dan rawa banjiran (flood plain). Di setiap stasiun pengamatan tersebut, ikan betok (Anabas testudinus) ditangkap dengan alat tangkul, jaring insang dan keblat. Ikan contoh dihitung dan masing-masing diukur panjang total dan bobotnya. Hubungan panjang berat dan pendugaan pertumbuhan ikan betok di masing-masing habitat diamati. Hasil penelitian menunjukkan bahwa hasil tangkapan ikan betok terbanyak di rawa. Pola pertumbuhan ikan betok jantan dan betina di habitat rawa berbeda, masing-masing mengikuti pola isometrik dan alometrik. Pola pertumbuhan ikan tersebut di sungai dan danau adalah alometrik, baik jantan maupun betina. Berdasarkan atas dugaan parameter pertumbuhan Von Bertalanffy, nilai K dan Loo untuk ikan betok adalah 0,73 th-1 dan 214, 2 mm di rawa, 0,66 th-1 dan 204,23 mm di sungai dan 1,30 th-1 dan 200,55 mm di danau. This research proposed to observe growth pattern of climbing perch (Anabas testudineus) in different habitats of Lake Melintang area, East Kalimantan Provincy. The research was executed using survey methods during rainy season, namely from November 2007 to January 2008. Sampling station was defined purposively in body of lake, river and floodplain area, respectively. In each station, the climbing perch was caught using lift net, gill net and trap (keblat). The fishes were numbered and measured for their total length and weight individually. Lenght and weight relationship and estimation of fish growth were calculated. The results indicated that the highest number of the climbing perch was observed in floodplain. Differences of growth pattern were observed for male and female of the fishes caught in floodplain, namely isometric and allometric respectively. However, there was no differences of the growth pattern in lake and river, following allometric growth. Base on von Bertalanffy equation, the values of K and Loo for climbing perch were 0.73 yr-1 and 214.2 mm; 0,66 yr-1 and 204,23 mm and 1,30 yr-1 and 200,55 mm for floodplain, river and lake, respectively.