Factors influencing transmission, onset and severity of outbreaks due to white sturgeon iridovirus in a commercial hatchery
Identifieur interne : 001569 ( Main/Merge ); précédent : 001568; suivant : 001570Factors influencing transmission, onset and severity of outbreaks due to white sturgeon iridovirus in a commercial hatchery
Auteurs : M. P. Georgiadis [États-Unis] ; R. P. Hedrick [États-Unis] ; T. E. Carpenter [États-Unis] ; I. A. Gardner [États-Unis]Source :
- Aquaculture : (Amsterdam) [ 0044-8486 ] ; 2001.
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- Pascal (Inist)
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Abstract
Progeny from six different spawns of white sturgeon broodstock were monitored for 20 months in a commercial white sturgeon hatchery for occurrence of outbreaks of white sturgeon iridovirus (WSIV) and white sturgeon herpesvirus-2 (WSHV-2). Five WSIV but no WSHV-2 outbreaks occurred during the study period. Signs of WSIV were restricted to tanks from a single spawn each time (except for one tank during the first outbreak). Temporal-spatial statistical analysis of outbreaks did not indicate that WSIV case tanks were clustered in time and space. Furthermore, WSIV was isolated from progeny of all six spawns participating in the study, even though occurrence of outbreaks and clinical presentation varied greatly among fish from different spawns. Despite failure to identify virus in samples from broodstock, these observations support a hypothesis of vertical transmission of WSIV, with tank-to-tank transmission having a lesser or no role in the spread of the virus. Differences in the onset and severity of WSIV outbreaks in fish from the six participating spawns indicate a possible genetic resistance to the virus and/or a role of stressors. All outbreaks, followed at least one major stressful event that occurred 9-32 days before the appearance of the first disease signs, and simulation modeling showed that the probability of this occurrence being a chance event was 0.14%, We conclude that minimization of stressors (avoidance of pump failures, handling and transportation) of the fish, should be a priority for the hatchery managers. Furthermore, since differences in resistance to WSIV probably exist among spawns, exclusion from reproduction of parents that yielded progeny susceptible to WSIV could improve survival of the young white sturgeon in hatcheries.
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P." last="Georgiadis">M. P. Georgiadis</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California</s1><s2>Davis, CA 95616</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Californie</region></placeName></affiliation></author><author><name sortKey="Hedrick, R P" sort="Hedrick, R P" uniqKey="Hedrick R" first="R. P." last="Hedrick">R. P. Hedrick</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California</s1><s2>Davis, CA 95616</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Californie</region></placeName></affiliation></author><author><name sortKey="Carpenter, T E" sort="Carpenter, T E" uniqKey="Carpenter T" first="T. E." last="Carpenter">T. E. Carpenter</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California</s1><s2>Davis, CA 95616</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Californie</region></placeName></affiliation></author><author><name sortKey="Gardner, I A" sort="Gardner, I A" uniqKey="Gardner I" first="I. A." last="Gardner">I. A. Gardner</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California</s1><s2>Davis, CA 95616</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Californie</region></placeName></affiliation></author></analytic><series><title level="j" type="main">Aquaculture : (Amsterdam)</title><title level="j" type="abbreviated">Aquaculture : (Amst.)</title><idno type="ISSN">0044-8486</idno><imprint><date when="2001">2001</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Aquaculture : (Amsterdam)</title><title level="j" type="abbreviated">Aquaculture : (Amst.)</title><idno type="ISSN">0044-8486</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Acipenser transmontanus</term><term>Farming animal</term><term>Fish herpesvirus</term><term>Hatchery</term><term>Iridovirus</term><term>Multidiurnal variation</term><term>Outbreak</term><term>Progeny</term><term>Severe</term><term>Simulation model</term><term>Spatial variation</term><term>Statistical analysis</term><term>Vertical transmission</term><term>Viral disease</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Transmission verticale</term><term>Grave</term><term>Pullulation</term><term>Iridovirus</term><term>Herpesvirus poisson</term><term>Virose</term><term>Descendance</term><term>Animal élevage</term><term>Modèle simulation</term><term>Variation spatiale</term><term>Variation pluri journalière</term><term>Analyse statistique</term><term>Ecloserie</term><term>Acipenser transmontanus</term><term>Acipenseridae</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Progeny from six different spawns of white sturgeon broodstock were monitored for 20 months in a commercial white sturgeon hatchery for occurrence of outbreaks of white sturgeon iridovirus (WSIV) and white sturgeon herpesvirus-2 (WSHV-2). Five WSIV but no WSHV-2 outbreaks occurred during the study period. Signs of WSIV were restricted to tanks from a single spawn each time (except for one tank during the first outbreak). Temporal-spatial statistical analysis of outbreaks did not indicate that WSIV case tanks were clustered in time and space. Furthermore, WSIV was isolated from progeny of all six spawns participating in the study, even though occurrence of outbreaks and clinical presentation varied greatly among fish from different spawns. Despite failure to identify virus in samples from broodstock, these observations support a hypothesis of vertical transmission of WSIV, with tank-to-tank transmission having a lesser or no role in the spread of the virus. Differences in the onset and severity of WSIV outbreaks in fish from the six participating spawns indicate a possible genetic resistance to the virus and/or a role of stressors. All outbreaks, followed at least one major stressful event that occurred 9-32 days before the appearance of the first disease signs, and simulation modeling showed that the probability of this occurrence being a chance event was 0.14%, We conclude that minimization of stressors (avoidance of pump failures, handling and transportation) of the fish, should be a priority for the hatchery managers. Furthermore, since differences in resistance to WSIV probably exist among spawns, exclusion from reproduction of parents that yielded progeny susceptible to WSIV could improve survival of the young white sturgeon in hatcheries.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Californie</li></region></list><tree><country name="États-Unis"><region name="Californie"><name sortKey="Georgiadis, M P" sort="Georgiadis, M P" uniqKey="Georgiadis M" first="M. P." last="Georgiadis">M. P. Georgiadis</name></region><name sortKey="Carpenter, T E" sort="Carpenter, T E" uniqKey="Carpenter T" first="T. E." last="Carpenter">T. E. Carpenter</name><name sortKey="Gardner, I A" sort="Gardner, I A" uniqKey="Gardner I" first="I. A." last="Gardner">I. A. Gardner</name><name sortKey="Hedrick, R P" sort="Hedrick, R P" uniqKey="Hedrick R" first="R. P." last="Hedrick">R. P. Hedrick</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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