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Tjakrawidjaja, Agus H
Research Center for Biology-Indonesian Institute of Sciences
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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DIMORFISME SEKSUAL DAN RASIO SEKSUAL JENDERDUA JENIS IRAN ARWANA ASIA {Scleropages jardinii dan S.formosus : Osteoglossidae) Tjakrawidjaja, Agus H
BERITA BIOLOGI Vol 8, No 3 (2006)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (574.877 KB) | DOI: 10.14203/beritabiologi.v8i3.794

Abstract

Study on biological reproduction aspects of Asian Arwanas fishes {Scleropages jardinii and S. formosus) particularly their sexual dimorphism and sexual ratio of gender is very important as a base for captivity breeding. Up to the present, it is difficult to determine the sexual identity of these Asian Arwanas, lead the difficulties in making sexual ratio description.The reliable sexual ratio in captive breeding would increase the production. The result of this research would be useful for reference in the identification of the gender of Asian Arwanas.
STUDI POPULASI IKAN KALOSO (Scleropages jardinii) DI RAWA POMO KECAMATAN CITAK MITAK, KABUPATEN MERAUKE, PAPUA Tjakrawidjaja, Agus H; Haryono, Haryono
BERITA BIOLOGI Vol 5, No 4 (2001)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/beritabiologi.v5i4.1119

Abstract

Study on the population of bony tongue/kaloso fish (Scleropages jardinii) of Papua was conducted in April 1998, located in Rawa Pomo, Kecamatan (District) of Citak Mitak, Kabupaten (Regency) Merauke, Papua.The aims were to know density,fecundity, 2 population growth and related aspects.The method used was catch per unit efforts, in 3 stations, within the area of 50.000 m width; sampling was done in each 30 minutes and fecundity was counted by eye (visual).The results showed that abundance index was 1.862 2 2ind./m ,population density 0.0043/m ,population growth 0.017 ind/m each year and fecundity range was 87-161 eggs. The most th abundance in 8 size ranged from 45.81 to 48.54 mm SL;first maturation attained at + 30 cm. We noted the fishes biodiversity in the location i.e. 21 species belongs to 18 genera and 17 families.
DAMPAK PENAMBANGAN GAMBUT TERHADAP BIODIVERSITAS IKAN DI KABUPATEN BENGKALIS, RIAU Haryono, Haryono; Tjakrawidjaja, Agus H
BERITA BIOLOGI Vol 5, No 3 (2000)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (406.237 KB) | DOI: 10.14203/beritabiologi.v5i3.1115

Abstract

A study on peat mining impact on fish diversity was conducted at Perawang, Bengkalis Regency,Province of Riau between 1996 and 1997.The purpose of study is to discover the diversity and potential of fishes in relation with water quality due to peat mining activities.The results recorded 17 species belonging to 14 genus and 10 families in mining areas, while in the protected areas (with 3 Watersheds) recorded 4 species in Bukit Batu, 21 species in Siak Kecil and 17 species in Kampar.Cyprinidae is dominant family in mining areas, while Belontiidae in protected areas.The water quality ranges are DO between 0.49 and 4.60 ppm, CO2 between 2.31 and 26.36 ppm, pH between 3.80 and 4.80 and turbidity 1.40 and 4.20. The potential offish found are mainly consumption and ornamental fish.
Co-Authors Haryono Haryono