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All Journal Biota: Jurnal Ilmiah Ilmu-Ilmu Hayati Majalah Ilmiah Biologi BIOSFERA: A Scientific Journal Journal of Tropical Biodiversity
Edy Yuwono
Unknown Affiliation
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Environmental Science Immunology & microbiology

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Deteksi Triploid Ikan Nilem (Osteochilus hasselti Valencienes 1842) Hasil Kejut Dingin 4oC Desi Susanti; Edy Yuwono; Yulia Sistina
Biota : Jurnal Ilmiah Ilmu-Ilmu Hayati Vol 17, No 3 (2012): October 2012
Publisher : Universitas Atma Jaya Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24002/biota.v17i3.149

Abstract

Protokol triploidisasi cyprinidae nilem dengan kejut dingin 4oC pada 1, 3, atau 5 menit dari waktu fertilisasi dengan lama kejut 15, 20, atau 25 menit terbukti efektif dari parameyter fertilitas, daya tetas, abnormalitas larva, sintasan benih, panjang benih, dan khususnya data dimensi eritrosit benih hasil perlakuan. Dimensi eritrosit berupa ukuran panjang (major axes), lebar (minor axes), luas, dan volume eritrosit. Benih hasil perlakuan kejut dingin terbukti triploid dengan dimensi eritrositnya secara sangat nyata (P<0,01) jauh lebih besar dibanding diploid normal kontrolnya. Perlakuan kejut dingin secara sangat nyata (P<0,01) mempengaruhi fertilitas telur dan panjang tubuh benih, namun tidak nyata (P>0,05) mempengaruhi persentase penetasan, persentase abnormalitas larva, dan sintasan benih. Penerapan protokol triploid kejut dingin nilem yang terbukit efektif untuk pada bidang akuakultur siap dijalankan.Kata kunci: Deteksi triploid, kejut dingin, lama kejut, nilem, dimensi eritrosit
Compensatory Growth and Feed Utilization of Humpback Grouper, Cromileptes altivelis Receiving Preset Period of Unfed-Fed Cycle Edy Yuwono; Purnama Sukardi
Majalah Ilmiah Biologi BIOSFERA: A Scientific Journal Vol 24, No 1 (2007)
Publisher : Fakultas Biologi | Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.mib.2007.24.1.148

Abstract

The effect of preset periods of unfed-fed cycle on growth, feed efficiency and body condition indices of humpback grouper, Cromileptes altivelis was studied. The fish receiving non-feeding/feeding cycle of 1/2 day (T1); 1/2 and 3 days alternately (T2); 1/3 day (T3); were compared to that fed daily as a control (C). Each feeding treatment was assigned to five fiberglass tanks according to a completely randomized design. All fish was weighed to obtain final weight gain at the end of the experiment. Feeding rate (FR) was calculated during feeding period throughout the experiment. At the end of the experiment all fish was weighed to obtain final fish weight. Absolute growth rate (AGR); survival; consumption; cumulative feed consumption, and feed conversion efficiency (FCE) were calculated. Data were subjected to analysis of variance and Tukey test (P<0.05). The results showed that humpback grouper Cromileptes altivelis receiving preset unfed-fed cycle elicited compensatory growth and the fish showed hyperphagia and greater feed conversion efficiency.
Condition of Seagrass at Prawean Beach, Jepara, Based on the Seagrass Ecological Quality Index (SEQI) S. Wahyuni, Endang; Edy Yuwono; Sri Handayani
Journal of Tropical Biodiversity Vol 6 No 1 (2025): December 2025
Publisher : Universitas Nasional Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59689/bio.v6i1.327

Abstract

This study aims to investigate the bioecology of seagrass at Prawean Beach, Jepara, through analysis of species composition, the Seagrass Ecological Quality Index (SEQI), environmental water parameters, as well as the connection between environmental variables and seagrass cover. Data collection was carried out in September at two stations using the method transect-quadratic, while the physical-chemical parameters water were measured in situ and analyzed in a way statistically. Research results show that Thalassia hemprichii is the dominant species with the highest coverage in all point observations, while Enhalus acoroides, Cymodocea rotundata, and Halodule uninervis have lower cover more low. The SEQI value is in the range of 45–50% which indicates a quality ecosystem in category medium. Analysis Spearman correlation reveals that brightness influential significant to cover seagrass (r = 0.82; p = 0.048), whereas salinity, temperature, DO, pH, nitrate, and phosphate show no significant connection. Findings This indicates that disturbance of the physical coast potential becomes factor main influencing factor health field of seagrass at Prawean Beach.
Co-Authors Desi Susanti Purnama Sukardi S. Wahyuni, Endang Sri Handayani Yulia Sistina