IHHN disease of Penaeus stylirostris

effects of shrimp size on disease expression

T. A. BELL, Donald V Lightner

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Abstract. Populations of Penaeus stylirostris, free of infectious hypodermal and haematopoietic necrosis virus (IHHNV), were divided into five size groups (PL2 [2‐day‐oldpostlarvae, approximately 5.0 mg], 3.7 g, 14.5 g, 21.3 g and 36.9 gaverage initial weight), and experimentally exposed to IHHNV per or. Statistical comparisons (histologically‐derived) of infection severity ratings from six weekly sample periods indicated the relative abundance of pathognomonic Cowdry type A intranuclear inclusion bodies (and, hence, the severity of the disease) differed between sizes. The results of comparisons showed a tendency for larger animals to have a significantly lower prevalence of inclusion bodies and associated histopathology than smaller animals. The results also indicated that the smaller (average weight) the group was, the shorter was the period of time from initial exposure to the first histological detection of the disease. Thus, the larger (in average weight) a population of P. stylirostris is upon initial exposure to IHHNV, the less acute will be disease manifestation within a given time and the longer will be the period before the disease is first histologically detectable. A predictive equation that defines the epizootiological relationship of IHHN disease within an intensively cultured population of P. stylirostris is also presented.

Original languageEnglish (US)
Pages (from-to)165-170
Number of pages6
JournalJournal of Fish Diseases
Volume10
Issue number3
DOIs
StatePublished - 1987

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Litopenaeus stylirostris
Penaeidae
Infectious hematopoietic necrosis virus
Densovirinae
shrimp
virus
nuclear inclusions
disease detection
Weights and Measures
inclusion bodies
group size
histopathology
disease severity
animals
Population
Intranuclear Inclusion Bodies
animal
Inclusion Bodies
relative abundance
infection

ASJC Scopus subject areas

  • Medicine(all)
  • Aquatic Science
  • veterinary (miscalleneous)

Cite this

IHHN disease of Penaeus stylirostris : effects of shrimp size on disease expression. / BELL, T. A.; Lightner, Donald V.

In: Journal of Fish Diseases, Vol. 10, No. 3, 1987, p. 165-170.

Research output: Contribution to journalArticle

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AB - Abstract. Populations of Penaeus stylirostris, free of infectious hypodermal and haematopoietic necrosis virus (IHHNV), were divided into five size groups (PL2 [2‐day‐oldpostlarvae, approximately 5.0 mg], 3.7 g, 14.5 g, 21.3 g and 36.9 gaverage initial weight), and experimentally exposed to IHHNV per or. Statistical comparisons (histologically‐derived) of infection severity ratings from six weekly sample periods indicated the relative abundance of pathognomonic Cowdry type A intranuclear inclusion bodies (and, hence, the severity of the disease) differed between sizes. The results of comparisons showed a tendency for larger animals to have a significantly lower prevalence of inclusion bodies and associated histopathology than smaller animals. The results also indicated that the smaller (average weight) the group was, the shorter was the period of time from initial exposure to the first histological detection of the disease. Thus, the larger (in average weight) a population of P. stylirostris is upon initial exposure to IHHNV, the less acute will be disease manifestation within a given time and the longer will be the period before the disease is first histologically detectable. A predictive equation that defines the epizootiological relationship of IHHN disease within an intensively cultured population of P. stylirostris is also presented.

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