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All Journal Jurnal Iktiologi Indonesia (Indonesian Journal of Ichthyology)
M. F. Rahardjo
Departemen Manajemen Sumberdaya Perairan Fakultas Perikanan dan Ilmu Kelautan Institut Pertanian Bogor
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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PEMANFAATAN MAKANAN OLEH IKAN-IKAN DOMINAN DI PERAIRAN WADUK Ir. H. DJUANDA [Utilization of Food by Dominant Fishes at Ir. H. Djuanda Reservoir] Nurnaningsih Nurnaningsih; M. F. Rahardjo; Sutrisno Sukimin
Jurnal Iktiologi Indonesia Vol 4 No 2 (2004): Desember 2004
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v4i2.245

Abstract

This study was conducted to reveal the utilization of food resources by fishes that were dominant at Ir. H. Djuanda Reservoir by using food habit and niche breadth analysis. Fish sampling was done from May to October 2003 in four stations of Ir. H. Djuanda Reservoir including its outlet. Stomach content analysis was conducted at laboratorium of Animal Ecology, Center for Biological Sciences IPB, while the plankton analysis was conducted at Research Station of Fish Stock Enhancement in Jatiluhur. It was found that there were four dominant fish species (Astronotus ocellatus, Amphilophus citrinellus t Oreochromis niloticus, Chanos chanos) exsisting in this reservoir. A. ocellatus and A. citrinellus were omnivorous, but C. chanos could be grouped as herbivorous. The plankton species that were found in their stomach were Coelastrum sp., Siaurastrumsp., Pediastrum sp., and Cosmarium sp. O. niloticus had the highest value of niche breadth, while C. chanos had the lowest value of this. It was also found that niche overlap between A. ocellatus and A. citrinellus, was the highest, while that between A. citrinellus and C. chanos was the lowest.
ASPEK PEMIJAHAN IKAN PETEK, Leiognathus equulus, FORSSKAL 1775 (FAM. LEIOGNATHIDAE) DI PESISIR MAYANGAN SUBANG JAWA BARAT [Gonadal Development, Fecundity, and Spawning Seasons of Sliymouth, Leiognathus equulus, Forsskal 1775 (Fam. Leiognathidae) in Mayangan Coastal, Subang, West Java] Rini Novitriana; Yunizar Ernawati; 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.v4i1.253

Abstract

Study was done from May to November 2003 in Mayangan coastal, West Java. Fish samples taken once in a month. Laboratory analysis comprises measuring of total length and body weight; sex determination; and morphological and histological observation of gonad maturity. Total samples is 970 fishes, comprises 528 male, 326 female, and 80 indeterminate sexually. Samples is in the size range 45-208 mm total length and 1.38 - 145.7 grams body weight. Presumably, fish spawn every month with peak spawning in August and it attain first maturity at least 88 mm (male) and 95 mm (female). Gonado somatic index (GSI) of male among 0,0105-3,3021%, while female have GSI among 0,2076-6,0658%. In size range 83-208 mm, fecundity is among 1.496-57.845 eggs, and this value have very close relationship with gonad weight. Observation of frequency distribution of eggs diameter show that fish spawn their eggs all at once (total spawner).
Co-Authors Nurnaningsih Nurnaningsih Rini Novitriana Sutrisno Sukimin Yunizar Ernawati