The effects of fish gender on susceptibility to acute Streptococcus agalactiae infection in Javanese medaka Oryzias javanicus

M. N.A. Amal, S. T. Zarif, M. S. Suhaiba, M. R.M. Aidil, Nasruddin Nurrul Shaqinah, M. Zamri-Saad, A. Ismail

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

This study describes the susceptibility of different fish gender following acute Streptococcus agalactiae infection by using Javanese medaka Oryzias javanicus as test fish. The fish were grouped into four groups, which were: (1) all-male; (2) all-female; (3) mixed-gender (1 male: 1 female ratio); and (4) control non-infected (1 male: 1 female ratio). The fish in group 1, 2 and 3 were intraperitoneally exposed to 5.4 × 108 CFU/mL of S. agalactiae, while for group 4, the fish were exposed using sterile broth. The main clinical signs and histopathological changes of infected Javanese medaka were commonly observed in S. agalactiae infected fishes. However, no difference on clinical signs and histopathological changes of fish in group 1, 2 and 3 were noticed. The Javanese medaka mortality in group 1, 2 and 3 were observed from 4 h post infection (hpi) to 6 hpi, with the cumulative mortality from 3% to 30%. Then, the mortality increased at 12 hpi, with the range from 53% to 80%. However, 100% of the infected fish dead at 24 hpi. No clinical sign, histopathological change and fish mortality recorded in group 4. Generally, the clinical signs, mortality patterns, cumulative mortality and histopathological changes of Javanese medaka infected by S. agalactiae did not show any difference between the all-male, all-female and mixed-gender groups. This indicates that the susceptibility of fish to S. agalactiae infection is not influenced by their gender.

Original languageEnglish
Pages (from-to)251-254
Number of pages4
JournalMicrobial Pathogenesis
Volume114
DOIs
Publication statusPublished - 1 Jan 2018

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Oryzias
Streptococcus agalactiae
Fishes
Infection
Mortality

Keywords

  • Fish gender
  • Javanese medaka
  • Streptococcus agalactiae
  • Susceptibility
  • Test organism

ASJC Scopus subject areas

  • Microbiology
  • Infectious Diseases

Cite this

The effects of fish gender on susceptibility to acute Streptococcus agalactiae infection in Javanese medaka Oryzias javanicus. / Amal, M. N.A.; Zarif, S. T.; Suhaiba, M. S.; Aidil, M. R.M.; Nurrul Shaqinah, Nasruddin; Zamri-Saad, M.; Ismail, A.

In: Microbial Pathogenesis, Vol. 114, 01.01.2018, p. 251-254.

Research output: Contribution to journalArticle

Amal, M. N.A. ; Zarif, S. T. ; Suhaiba, M. S. ; Aidil, M. R.M. ; Nurrul Shaqinah, Nasruddin ; Zamri-Saad, M. ; Ismail, A. / The effects of fish gender on susceptibility to acute Streptococcus agalactiae infection in Javanese medaka Oryzias javanicus. In: Microbial Pathogenesis. 2018 ; Vol. 114. pp. 251-254.
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abstract = "This study describes the susceptibility of different fish gender following acute Streptococcus agalactiae infection by using Javanese medaka Oryzias javanicus as test fish. The fish were grouped into four groups, which were: (1) all-male; (2) all-female; (3) mixed-gender (1 male: 1 female ratio); and (4) control non-infected (1 male: 1 female ratio). The fish in group 1, 2 and 3 were intraperitoneally exposed to 5.4 × 108 CFU/mL of S. agalactiae, while for group 4, the fish were exposed using sterile broth. The main clinical signs and histopathological changes of infected Javanese medaka were commonly observed in S. agalactiae infected fishes. However, no difference on clinical signs and histopathological changes of fish in group 1, 2 and 3 were noticed. The Javanese medaka mortality in group 1, 2 and 3 were observed from 4 h post infection (hpi) to 6 hpi, with the cumulative mortality from 3{\%} to 30{\%}. Then, the mortality increased at 12 hpi, with the range from 53{\%} to 80{\%}. However, 100{\%} of the infected fish dead at 24 hpi. No clinical sign, histopathological change and fish mortality recorded in group 4. Generally, the clinical signs, mortality patterns, cumulative mortality and histopathological changes of Javanese medaka infected by S. agalactiae did not show any difference between the all-male, all-female and mixed-gender groups. This indicates that the susceptibility of fish to S. agalactiae infection is not influenced by their gender.",
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