Karakteristik dan Patogenisitas Streptococcus Agalactiae Tipe ?-hemolitik dan Non-hemolitik pada Ikan Nila

  • Esti Handayani Hardi
  • Sukenda -
  • Enang Harris
  • Angela Mariana Lusiastuti

Abstract

Streptococcus agalactiae was isolated from cultured Nile tilapia (Oreochromis niloticus) in Cirata gulfand Klaten. The isolates were Gram positive cocci, oxidative fermentative positive, motility, and catalasenegative, grown on media containing NaCl 6.5%, ?-haemolytic and non-haemolytic. Two types of S. agalactiae(?-haemolytic and non-haemolytic) are different from their variety of sugars fermentation. Strains ?-haemolytic can ferment more sugars, including arabinose, sorbitol, lactose, and trehalose. Experimentalinfectivity trials on Nile tilapia (size 15 g), non-haemolytic type showed more virulent. This type causedfaster mortality, more severe behavior changes, and pathology changes than â-haemolytic type. NonhemoliticS. agalactiae caused 48% mortality 6-24 hours after injection, whereas â-haemolitic type caused17% mortality which it occured in 48 hours after injection (mortality of fish control 2,22%). Behaviordisease signs caused by non-haemolitic S. agalactiae started to happen 6 hours after injection whereas 12hours in ?-haemolytic type infection. Histopatological changes were observed on fish eye, spleen, andbrain. Hyperaemia, hyperthrophi, degeneration, and necrosis were also found on infected fish. Thisresearch was concluded that non-haemolytic of S. agalactiae was more virulent than ?-haemolytic.

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Author Biographies

Esti Handayani Hardi
Laboratorium Mikrobiologi Perairan, Universitas Mulawarman Kalimantan Timur
Sukenda -
Laboratorium Kesehatan Ikan Institut Pertanian Bogor, Jawa Barat
Enang Harris
Laboratorium Sistem dan Teknologi Akuakultur Institut Pertanian Bogor, Jawa Barat
Angela Mariana Lusiastuti
Laboratorium Kesehatan Ikan Balai Riset Perikanan Budidaya Air Tawar Bogor, Jawa Barat
How to Cite
HANDAYANI HARDI, Esti et al. Karakteristik dan Patogenisitas Streptococcus Agalactiae Tipe ?-hemolitik dan Non-hemolitik pada Ikan Nila. Jurnal Veteriner, [S.l.], p. 152-164, nov. 2012. ISSN 2477-5665. Available at: <http://ojs.unud.ac.id/index.php/jvet/article/view/3496>. Date accessed: 27 sep. 2025.
Citation Formats
Issue
Vol 12, No 2 (2011)
Section
Articles

Keywords

Characterization, pathogenicity, Streptococcus agalactiae, Oreochromis niloticus
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License
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