Affiliation:
1. Station Biologique de Roscoff, CNRS, Université Paris VI, 29682 Roscoff, France
Abstract
ABSTRACT
Oysters are permanently exposed to various microbes, and their defense system is continuously solicited to prevent accumulation of invading and pathogenic organisms. Therefore, impairment of the animal's defense system usually results in mass mortalities in cultured oyster stocks or increased bacterial loads in food products intended for human consumption. In the present study, experiments were conducted to examine the effects of stress on the juvenile oyster's resistance to the oyster pathogen
Vibrio splendidus
. Oysters (
Crassostrea gigas
) were challenged with a low dose of a pathogenic
V. splendidus
strain and subjected to a mechanical stress 3 days later. Both mortality and
V.
splendidus
loads increased in stressed oysters, whereas they remained low in unstressed animals. Injection of noradrenaline or adrenocorticotropic hormone, two key components of the oyster neuroendocrine stress response system, also caused higher mortality and increased accumulation of
V. splendidus
in challenged oysters. These results suggest that the physiological changes imposed by stress, or stress hormones, influenced host-pathogen interactions in oysters and increased juvenile
C. gigas
vulnerability to
Vibrio splendidus
.
Publisher
American Society for Microbiology
Subject
Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology
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