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All Journal Jurnal Iktiologi Indonesia (Indonesian Journal of Ichthyology) Jurnal Natural
Djadja S. Sjafei
Masyarakat Iktiologi Indonesia
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Preferensi makanan ikan pelangi arfak, Melanotaenia arfakensis Allen, 1990 di Sungai Nimbai dan Sungai Aimasi, Manokwari [Food preference of arfak rainbowfish, Melanotaenia arfakensis Allen, 1990 in Nimbai and Aimasi Streams, Manokwari] Emmanuel Manangkalangi; M.F. Rahardjo; Djadja S. Sjafei; Sulistiono Sulistiono
Jurnal Iktiologi Indonesia Vol 10 No 2 (2010): Desember 2010
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v10i2.164

Abstract

The study of food preference of arfak rainbowfish (Melanotaenia arfakensis) in Nimbai and Aimasi streams, and Prafi river system were conducted from June to December 2007. Sampling was carried out monthly for seven months in four different habitat types, i.e. slow littoral, still littoral, pool, and run areas. Results showed that abundance of plankton and macroinvertebrate were found both in slow littoral and medium littoral, especially during low flow period (June to October). Macroinvertebrate that found naturally abundance are insect groups. Arfak rainbowfish are insectivorous, with preponderance index of stomach content during these periods are dominated by insect groups, i.e. Diptera, Ephemero-ptera, Coleoptera, and Trichoptera, so this species categorized as insectivorous. Also, electivity index showed a trend of food specification that naturally abundance. In order to maintain the population of arfak rainbowfish, conservation of their natural habitats is needed, especially riparian zone in channel of stream as its site of food source. AbstrakPenelitian preferensi makanan ikan pelangi arfak (Melanotaenia arfakensis) di Sungai Nimbai dan Aimasi di sistem Sungai Prafi dilaksanakan dari bulan Juni sampai Desember 2007. Pengambilan contoh dilakukan pada empat tipe habitat di dua lokasi penelitian, yaitu: bagian tepi beraliran lambat, bagian tepi beraliran sedang, lubuk, dan daerah beralir-an deras. Hasil penelitian memperlihatkan bahwa kelimpahan plankton dan makroavertebrata ditemukan pada tipe habitat beraliran lambat dan sedang pada saat kondisi debit air rendah (Juni-Oktober). Makroavertebrata yang ditemukan berlimpah adalah kelompok insekta. Ikan pelangi arfak adalah insektivora, terutama didominasi oleh kelompok insekta, ya-itu Diptera, Ephemeroptera, Coleoptera, dan Trichoptera. Indeks pilihan menunjukkan adanya kecenderungan pemilihan makanan yang terdapat dalam kondisi melimpah di perairan. Guna menjaga kelestarian ikan ini, konservasi habitat alaminya sangat diperlukan, terutama zona riparian yang merupakan tapak sumber daya makanannya.
MUSIM PEMIJAHAN IKAN PELANGI ARFAK (Melanotaenia arfakensis ALLEN) DI SUNGAI NIMBAI DAN SUNGAI AIMASI, MANOKWARI [Spawning Season of Arfak Rainbowfish (Melanotaenia arfakensis Allen) in Nimbai and Aimasi Streams, Manokwari] Emmanuel Manangkalangi; M. F. Rahardjo; Djadja S. Sjafei; Sulistiono Sulistiono
Jurnal Iktiologi Indonesia Vol 9 No 1 (2009): Juni 2009
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v9i1.195

Abstract

The study was aimed to describe the spawning season of arfak rainbowfish (Melanotaenia arfakensis) in Nimbai and Aimasi streams, both are located in Prafi river system. Sampling was conducted from June to December 2007 and carried out monthly in four different habitat types using hand net. A total of 752 individual specimens were collected and consisted of five developmental stages, namely egg, larvae, juvenile, young and adult. There was no different proportion in both sexes, either habitat type or time. This species has relatively low fecund, producing approximately 23-1,351 eggs with relatively large diameter (0.5-1.3 mm). Large egg diameter was distributed in posterior of ovaries, with 2-3 modes, and presence of atretic eggs, and was indicated as multiple spawner fish. However, based on gonado somatic index, condition factor, presence of eggs and larva in limited period showed that there were increased reproductive activities in both locations from June to September, with low water flow condition. Concentration of reproduction activity during dry season to ensure that larva was produced relatively stable and in benign physical condition. In order to maintain the population of this species, both of these streams should be reserved as their natural habitats, thereby its life cycles could go on.
ASPEK PEMIJAHAN IKAN MOTAN, Thynnichthys thynnoides, BL1EKER1852 (FAMILICYPRINIDAE) DI RAWA BANJIRAN SUNGAI KAMPAR KIRI, RIAU [Spawning aspects of Thynnichthys thynnoides Bleeker 1852 (Family Cyprinidae) in the floodplain of Kampar Kiri River, Riau] Prawira Atmaja R.P. Tampubolon; M. F. Rahardjo; Djadja S. Sjafei; Charles PH Simanjuntak
Jurnal Iktiologi Indonesia Vol 8 No 1 (2008): Juni 2008
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v8i1.280

Abstract

Study on the spawning aspects of Thynnichthys thynnoides in the floodplain of Kampar Kiri River was conducted from June 2006 to December 2006, using experimental gillnet and trap. Total samples were 852 individuals, comprised 479 individuals from Mentulik (294 males and 185 females) and 373 individuals from Simalinyang (197 males and 176 females). The range of total length was between 94-198 mm for fishes caught from Mentulik and 104-227 mm from Simalinyang. Sex ratio was counted for fishes in QSIIV. Sex ratio is balanced for fish in Mentulik and unbalanced for fish in Simalinyang. The first size of maturity for male in Mentulik and in Simalinyang were 105 and 118 mm; while for female ones were 109 and 108 mm. Presumably, the spawning season is on September-December with the peak spawning in October. Fecundity ranged 781-27135 eggs for fish from Mentulik and 797-35804 eggs from Simalinyang. The Fish is indieaied to be a total spawner.
HABITAT IKAN PELANGI ARFAK (Melanotaenia arfakensis ALLEN) BERDASARKAN TAHAP PERKEMBANGAN DI SUNGAI NIMBAI DAN SUNGAI AIMASI, MANOKWARI Emmanuel Manangkalangi; M. F. Rahardjo; Djadja S. Sjafei
Jurnal Natural Vol. 8 No. 1 (2009): Jurnal Natural
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The habitat ontogeny of arfak rainbowfish (Melanotaenia arfakensis Allen) in Nimbai and Aimasi streams, Prafi river system were studied from June to December 2007. Sampling was carried out monthly in four different habitat types using hand net. Slow littoral and medium littoral are two habitat types which characterized by slowly water velocity, availability of submerged vegetation and warmer temperature, however the run and pool areas have higher water velocity and dissolve oxygen. The former habitats are essential for all developed stages, i.e. feeding, spawning and nursing of this species. On the other hand, the later habitat types particularly were only for young and adult fish, due to their swimming abilities as well as maximize of oxygen uptake. In order to maintain the population of this species, conservation is needed to all of their natural habitats for continuing their life cycles.
Co-Authors Charles Parningotan Haratua Simanjuntak Emmanuel Manangkalangi M. F. Rahardjo M. F. Rahardjo M. F. Rahardjo M.F. Rahardjo Prawira Atmaja R.P. Tampubolon Sulistiono Sulistiono