Observations on the pathogenesis of the imperfect fungus, Fusarium solani, in the California brown shrimp, Penaeus californiensis

J. E. Hose, D. V. Lightner, R. M. Redman, D. A. Danald

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

The pathogenesis of Fusarium solani infections was studied using a highly susceptible species, Penaeus californiensis. In two experiments, F. solani infections were established in artificially wounded and infected juvenile and adults of P. californiensis, while similar control groups were wounded but not artificially infected. In the first experiment, the progress of F. solani infections in 15-g cultured juveniles of P. californiensis was followed by gross inspection and by light and electron microscopical study of the wound area. Developing F. solani infections were produced with a success rate of 100% within 14 days postinfection, and deaths due to disease of greater than 50% of the artificially infected group had occurred by 24 days postinfection. Infections were histologically characterized by (1) expansion of lesions into the tissue surrounding the point of entry, (2) destruction of invaded tissues by host granuloma formation and possibly by fungal enzymes and toxins, and (3) hemocyte encapsulation of hyphae with eventual melanization of the encapsulating hemocytes. In the second study, wild adult P. californiensis were artificially infected with F. solani, and changes in several of their hemolymph constituents [alkaline phosphatase, serum glutamic oxaloacetic transaminase (SGOT), glucose, total protein, hemocyte count, and hematopoietic tissue mitotic index] were determined as the disease developed. Significant differences occurred in these hemolymph parameters of shrimp with advanced F. solani infections compared to those of uninfected, unwounded control shrimp or those with early F. solani infections. Hemolymph from severely infected shrimp was hypoproteinemic, contained lower numbers of circulating hemocytes, and frequently failed to coagulate.

Original languageEnglish (US)
Pages (from-to)292-303
Number of pages12
JournalJournal of Invertebrate Pathology
Volume44
Issue number3
DOIs
StatePublished - Nov 1984

Keywords

  • "burn spot" disease
  • Fusarium solani
  • Penaeus californiensis
  • aquaculture
  • fungal disease
  • histopathology
  • pathogenesis
  • shrimp culture

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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