Vibrio parahaemolyticus and V. harveyi cause detachment of the epithelium from the midgut trunk of the penaeid shrimp Sicyonia ingentis

Diseases of Aquatic Organisms
Gary G MartinErica Swanson

Abstract

Shrimp Sicyonia ingentis were either injected with Vibrio parahaemolyticus (10(4) CFU) or V. harveyi (10(6) CFU) or immersed in ASW containing either species at 10(5) CFU ml(-1). These densities were shown in preliminary experiments to kill approximately half the population by 7 d. On Day 7, surviving shrimp were classified as either diseased or apparently healthy, and their midgut trunks (MGT) were examined by light and electron microscopy. All shrimp immersed in ASW containing either species of Vibrio showed detachment of the epithelium in the MGT. In shrimp injected with either species of Vibrio, epithelial detachment was common in diseased shrimp but not in apparently healthy animals. Experiments with live shrimp were supported by in vitro experiments where MGTs were removed, tied off at both ends, and injected with either pathogenic bacteria (V. parahaemolyticus or V. harveyi), non-pathogenic bacteria (Bacillus subtilis or Escherichia coli), or ASW. After 2 h incubations in ASW at 15 degrees C, the MGTs were processed and examined. The epithelium consistently detached from isolated MGTs injected with either species of Vibrio, but not from MGTs injected with non-pathogenic bacteria or ASW. Because the MGT epithelium secrete...Continue Reading

Citations

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