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INDONESIA
BERITA BIOLOGI
Published by Lembaga Ilmu Pengetahuan Indonesia
ISSN : -     EISSN : -     DOI : -
Core Subject : Science, Agriculture,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology
Arjuna Subject : -
Articles 13 Documents
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Search results for , issue "Vol 20, No 1 (2021)" : 13 Documents clear
CHARACTERIZATION OF SUPERNATANT EXTRACT AND VIABILITY OF BACILLUS SUBTILIS KM16 AND PSEUDOMONAS SPP. IN FISH FEED AS BIOCONTROL AGENTS AGAINST AQUACULTURE PATHOGENS Stella Magdalena; Brenda Kristanti; Yogiara Yogiara
BERITA BIOLOGI Vol 20, No 1 (2021)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/beritabiologi.v20i1.3973

Abstract

The use of biocontrol agent in aquaculture is being adapted as an effective alternative to antibiotics which can lead to the elaboration of antibiotic-resistant bacteria and confer unpleasant impacts to aquatic organisms. Aquatic bacteria have been discovered as biocontrol agents and potential probiotic candidates to improve the health of aquatic organisms, feed efficiency, and disease resistance to aquaculture pathogens. However, local isolate has not intensively been explored and used to increase aquaculture sector productivity. Therefore, this research aimed to determine minimum inhibitory concentrations of their antibacterial compounds against aquaculture pathogens and to characterize aquatic bacteria by their viability in the feed. Four isolates from several aquatic environments in Indonesia (Pseudomonas sp. S1.1, Pseudomonas sp. S1.2, Pseudomonas sp. SL1.1, and Bacillus subtilis KM16) were used to characterize of antibacterial compound and to determine the viability in feed. Ethyl acetate extracts from all isolates showed better antibacaterial activity against Aeromonas hydrophila and Vibrio vulnificus than chloroform and dichloromethane extracts, in which ethyl acetate extract from Bacillus subtilis KM16 showed the strongest antibacterial activity. Pseudomonas spp. were more effective against V. vulnificus (40 mg/mL) and Bacillus subtilis KM16 was more effective against A. hydrophila (20 mg/mL), as proved by the minimum inhibitory concentrations of their ethyl acetate extracts. In this research, Bacillus subtilis KM16 had stable viability in feed than Pseudomonas sp. isolates. 
KEANEKARAGAMAN DAN KOMPOSISI SPESIES MAKROALGA LAUT PADA TIPOLOGI PANTAI YANG BERBEDA DI KAWASAN PESISIR GUNUNGKIDUL D.I. YOGYAKARTA Dwi Sartika; Abdul Razaq Chasani; Ajeng Meidya Ningrum; Septi Lutfiatun Nafiah; Septy Wulan Cahyani
BERITA BIOLOGI Vol 20, No 1 (2021)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/beritabiologi.v20i1.3941

Abstract

Makroalga laut merupakan alga makroskopis yang dapat dijumpai di daerah intertidal kawasan pesisir Gunungkidul D.I. Yogyakarta, terdiri dari makroalga hijau (Chlorophyceae), coklat (Phaeophyceae), dan merah (Florideophyceae). Kawasan pesisir Gunungkidul terdiri dari deretan pantai dengan berbagai tipologi sehingga keanekaragaman jenis makroalga lautnya akan berbeda pada tipologi pantai yang berbeda. Penelitian ini bertujuan untuk mengetahui keanekaragaman dan komposisi spesies makroalga laut pada tipologi pantai yang berbeda di kawasan pesisir Gunungkidul D.I. Yogyakarta. Pengambilan sampel dilakukan pada bulan September 2019 hingga Februari 2020 menggunakan metode purposive sampling, kemudian dilakukan pengawetan awetan basah dan identifikasi di Laboratorium Sistematika Tumuhan Fakultas Biologi UGM. Perbandingan komposisi spesies dianalisis berdasarkan Indeks Kesamaan Sorensen. Dari hasil penelitian yang dilakukan didapatkan 37 spesies yang tergolong kedalam 28 genus, 19 family dan 10 ordo, Makroalga laut di wilayah pesisir Gunungkidul di dominasi oleh kelas Florideophyceae dengan persentase kehadiran spesies 43,37% (18 spesies); kelas Chlorophyceae 28,95% (10 spesies); dan Phaeophyceae 23,68% (9 spesies). Komposisi spesies makroalga laut di kawasan pesisir Gunungkidul memiliki tingkat kesamaan yang tinggi (>0,5) walaupun hidup di tipologi pantai yang berbeda. Persamaan tertinggi ditemukan pada makroalga laut yang hidup di pantai dengan tipologi subaerial dan marine deposition coast. 
ASPEK BIOLOGIS IKAN EKOR PEDANG (Xiphophorus hellerii HECKEL, 1848) DI CATUR DANAU BALI I Nyoman Yoga Parawangsa; Prawira Atmaja Rintar Pandapotan Tampubolon; Nyoman Dati Pertami
BERITA BIOLOGI Vol 20, No 1 (2021)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/beritabiologi.v20i1.3864

Abstract

Ikan ekor pedang (Xiphophorus hellerii) merupakan jenis ikan asing yang mendiami catur danau Bali (Danau Tamblingan, Danau Buyan, Danau Bratan dan Danau Batur). Tujuan penelitian ini adalah untuk mengungkapkan nisbah kelamin, pola pertumbuhan dan kondisi ikan ekor pedang di catur danau Bali. Nisbah kelamin ikan ekor pedang di keempat danau berada dalam keadaan tidak seimbang. Proporsi ikan jantan di Danau Tamblingan, Danau Beratan dan Danau Batur lebih banyak daripada ikan betina dan kondisi sebaliknya ditemukan di Danau Buyan. Pola pertumbuhan ikan jantan di catur danau Bali adalah alometrik negatif dan ikan betina menunjukkan pola pertumbuhan alometrik negatif di Danau Tamblingan dan Danau Beratan dan pola pertumbuhan isometrik di Danau Buyan dan Danau Batur. Spesies ikan ini berada dalam kondisi baik di catur danau Bali dengan nilai faktor kondisi berkisar antara 0,47–1,54 dengan rerata 0,92 untuk ikan jantan dan 0,43–2,94 dengan rerata 1,12 untuk ikan betina. 

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