Predatorism and Cannibalism of Fish Betutu (Oxyeleotris marmorata Blkr.) In Lake Tondano, Minahasa regency, North Sulawesi
DOI:
https://doi.org/10.35800/jip.7.1.2019.23217Abstract
Aims of this study is to determine the ability of marble goby to prey other fish and other marble goby in Tondano Lake. This research was conducted in August 2017 to December 2017. Measure of aquarium used as container is 120 cm x 40 cm x 40 cm which was divided into 2 parts, equipped with a camera in addition to observe the reaction of predation on marble goby. To know the predation behaviour of marble goby, using sample size is <15 cm and> 15 cm, and the prey fish is used was silver barb (Puntius javanicus) size is 10 cm - 20 cm. To determine the cannibal behaviour is used marble goby size is <15 cm and> 20 cm, and prey another marble goby size is 10-20 cm. The results showed the fastest predatorism reaction of marble goby attack silver barb occurred is 6 minutes after treatment, and the fastest cannibalism reaction of marble goby occurred after 45 minutes.
Keywords: Betutu, Lake Tondano, Cannibalism, Predation, Predatorism.
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ABSTRAK
Penelitian ini bertujuan untuk mengetahui kemampuan ikan betutu dalam memangsa ikan lain dan sesama ikan betutu di Danau Tondano. Waktu penelitian dilakukan pada bulan Agustus 2017 sampai Desember 2017. Wadah yang digunakan adalah akuarium berukuran 120 cm x 40 cm x 40 cm yang dibagi menjadi 2 bagian dengan menggunakan sekat, dilengkapi dengan kamera untuk mengamati reaksi pemangsaan ikan betutu. Untuk mengetahui sifat predator ikan betutu digunakan sampel berukuran <15 cm dan >15 cm, dan mangsa yang digunakan adalah ikan tawes (Puntius javanicus) yang berukuran 10 cm - 20 cm. Untuk mengetahui sifat kanibal ikan betutu digunakan ikan betutu berukuran <15 cm dan >20 cm, dan mangsa ikan betutu berukuran 10-20 cm. Hasil penelitian menunjukkan reaksi tercepat predatorisme ikan betutu terhadap ikan tawes terjadi setelah 6 menit setelah perlakuan, dan reaksi tercepat kanibalisme ikan betutu terjadi setelah 45 menit.
Kata kunci: Betutu, Danau Tondano, Kanibalisme, Pemangsaan, Predatorisme
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