Protective Effect of κ-Carrageenan against Bacterial Infections in Carp Cyprinus carpio

Kazuhiro Fujiki, Dong Ho Shin, Miki Nakao, Tomoki Yano

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


A hot-water extract of tsunomata Chondrus ocellatus was found to contain polysaccharide(s) which showed immunoenhancing activity in fish. In order to identify the effective component, the hot-water extract of tsunomata was fractionated and 0.3 M KCl-insoluble and -soluble fractions (Fractions I and II) were evaluated for their potential to enhance protection against Edwardsiella tarda and Aeromonas hydrophila infections in carp. Intraperitoneal injection of Fraction I (2-3 mg/100g body weight) 6 and 3 days prior to challenge with the pathogenic bacteria resulted in significantly greater survival than that of the control fish. On the other hand, Fraction II was not effective against the pathogenic bacteria at any dose. Chemical and physicochemical analyses revealed that Fraction I was κ-carrageenan containing a trace quantity of ι-carrageenan.

Original languageEnglish
Pages (from-to)113-119
Number of pages7
JournalJournal of the Faculty of Agriculture, Kyushu University
Issue number1-2
Publication statusPublished - Dec 1997

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science
  • Biotechnology


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