HABITAT PEMIJAHAN DAN ASUHAN IKAN BILIH Mystacoleucus padangensis (Bleeker, 1852) DI SUNGAI NABORSAHAN, DANAU TOBA, SUMATERA UTARA

Abstract

Ikan bilih (Mystacoleucus padangensis) merupakan salah satu ikan dari famili cyprinidae yang melakukan ruaya pemijahan dari danau menuju sungai. Habitat pemijahan dan asuhanikan bilih perlu dikaji sebelum melakukan upaya pemulihan kembali ikan bilih di Danau Toba. Tujuan penelitian ini adalah untuk mengetahui habitat pemijahan dan habitat asuhan ikan bilih. Habitat pemijahan ditentukan berdasarkan jumlah ikan matang gonad dan habitat asuhan diidentifikasi berdasarkan keberadaan juvenil ikan bilih di Sungai Naborsahan, Danau Toba Sumatera Utara. Pengambilan sampel ikan bulanan (April 2013 sampai Mei 2014) dilakukan di enam stasiun yang ditentukan berdasarkan karakteristik sungai dan habitat ikan bilih. Ikan bilih matang gonad (siap mijah) dapat ditemukan di semua stasiun penelitian. Seluruh lokasi penelitian merupakan habitat pemijahan ikan bilih. Juvenil ikan bilih hanya ditemukan di stasiun 3, 4, 5 dan 6. Oleh karena itu, diduga stasiun 1 dan 2 merupakan daerah pemijahan bagi ikan bilih sedangkan stasiun 3, 4, 5, dan 6 merupakan daerah pemijahan sekaligus juga daerah asuhan ikan bilih.Bilih fish (Mystacoleucus padangensis) is a species of the Cyprinidae family that have migration pattern from the lake to the river for spawning purpose. Spawning and nursery ground of bilih fish needs to be assessed before making a recovery effort of bilih fish in Lake Toba. The purpose of this study was to determine the nursery and spawning ground of bilih fish. Spawning ground is determined based on the number of mature gonad fishes and the nursery ground identified based on the presence of juvenile fishes in the Naborsahan River, Toba Lake, North Sumatra. The montly samples (April 2013 to May 2014) were collected from six stations that was determined based on the characteristics of the river and bilih fish habitat . The results showed that the mature gonad fish can be found at all research stations. The entire study sites are spawning habitat of bilih fish. The juvenile  was found at the stations 3, 4, 5 and 6. This phenomena suggests that the stations 1 and 2 possibly were only a spawning ground while the stations 3, 4, 5, and 6 were both the spawning and nursery ground of bilih fish

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