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All Journal Jurnal Iktiologi Indonesia (Indonesian Journal of Ichthyology) Berkala Penelitian Hayati
M. F. Rahardjo
Fakultas Perikanan dan Ilmu Kelautan, Institut Pertanian Bogor
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology Materials Science & Nanotechnology Medicine & Pharmacology

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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.
STRATEGI KONSERVASI HABITAT UNTUK MEMPERTAHANKAN KEANEKARAGAMAN IKAN DI RAWA LEBAK SUNGAIRUNGAN, PALANGKARAYA, KALIMANTAN TENGAH [Habitat conservation strategy to maintain fish diversity in the Rungan River Floodplain, Palangkaraya, Central Kalimantan] Bambang Sulistiyarto; Dedi Soedharma; M. F. Rahardjo; Sumardjo Sumardjo
Jurnal Iktiologi Indonesia Vol 7 No 1 (2007): Juni 2007
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v7i1.221

Abstract

The largest fraction of freshwater fish diversity is presented in floodplain ecosystem. Moreover, floodplain fisheries in Kalimantan have an important contribution to local community livelihoods. Floodplain ecosystems are faster to be damage and loss than other ecosystems. Consequently, conservation of fish habitat is urgently needed to maintain fish diversity. The objectives of this study were to give strategies of fish habitat conservation for maintaining fish diversity, based on biophysical and social analysis. Studies were carried out in Petuk Ketimpun District of Palangkaraya Municipality. Biophysical variables were studied by monthly samples taken from May 2005 to April 2006. These were carried out at three stations with different habitat type, includes forested swamp, opened swamp, and river. Social and cultural information collected by interviewing with fishers and local government agencies. A total of 4278 fishes were collected consisting of 50 species and 19 families. Forest swamps and river are habitat priorities to be conserved. The conservation of forest swamps is directed to maintain of the habitat structure, while the conservation of river is directed to maintain water quality and to maintain river as fish refuge site at low water season. Fishery regulation is priority used for maintaining fish diversity in opened swamps.
KEBIASAAN MAKANAN IKAN TEMBANG Sardinella flmbriata Val. (Fam. Clupeidae) DI PERAIRAN TELUK KENDARI SULAWESI TENGGARA [Study on Food Habits of Fringescale Sardinella, Sardinellafimbriata Val. (Fam. Clupeidae) in Kendari Bay, Southeast Sulawesi] Asriyana Asriyana; Sulistiono Sulistiono; M. F. Rahardjo
Jurnal Iktiologi Indonesia Vol 4 No 1 (2004): Juni 2004
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v4i1.256

Abstract

A study on food habit of Fringescale Sardinella, Sardinella fimbriata Val. in Kendari Bay was conducted from March to December 2003. This research aims to observe food habits and feeding periodicity of the fish and relation of the food habits and plankton, food habit was determined by using Index of Relative Importance method. Result of the study indicates that fringescale Sardinella is plankton feeder and taking its food by filtering. Important diet of fish is Bacillariophyceae and Crustacea.
PENGARUH SUHU DAN OKSIGEN TERLARUT TERHADAP TINGKAT METABOLISME DAN KELANGSUNGAN HIDUP LARVA IKAN BAUNG Mystus nemurus Cuv & Val Usman Muhammad Tang; Ridwan Affandi; R. Widjajakusuma; Heru Setijanto; M. F. Rahardjo
JURNAL PENELITIAN BIOLOGI BERKALA PENELITIAN HAYATI Vol 6 No 1 (2000): December 2000
Publisher : The East Java Biological Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23869/479

Abstract

The rearing technology of green catfish larvae has not yet established. Hight mortality occurred in the early larval stages. This experiment was conducted to study the effect of temperature and dissolved oxygen on metabolic rate and survival rate of green catfish larvae. 3600 green catfish larvae with initial individual mean weights of 1.24 ±0.19 mg and lengths 5.85 ±0.71 mm (one day after hatching) were reared in the aquarium of 30 cm x 30 cm x 40 cm dimension. Treatments were done at 3 levels of temperature 27oC, 30oC, and 33oC; and 3 levels of dissolved oxygen 6.47 ml/L, 1.05 ml/L, and 0.78 ml/L and 3 replications. The result showed that temperature and dissolved oxygen was significant to the oxygen consumption. Oxygen consumption of 0.67 ±0.25 mg O2/h/g and 0.86 ±0.005 mg O2/h/g was highest in larval reared at 33oC and dissolved oxygen 6.47 ml/L for 3 weeks. The higher water temperature the greater the oxygen consumption. The oxygen consumption decline with decreasing dissolved oxygen in the water, indicating an axyconformer type. The temperature was not significant to the survival rate and growth of the larvae. However the effect of dissolved oxygen was significant to the growth rate (P<0.05). Growth rate of 25.69 ±0.55% was highest in larval reared at 6.47 mg/L for 3 weeks.
Co-Authors Asriyana Asriyana Bambang Sulistiyarto Dedi Soedharma Djadja S. Sjafei Emmanuel Manangkalangi Heru Setijanto R. Widjajakusuma RIDWAN AFFANDI Sulistiono Sulistiono Sumardjo Usman Muhammad Tang