{"id":39412,"date":"2013-08-27T22:01:15","date_gmt":"2013-08-27T20:01:15","guid":{"rendered":"http:\/\/staging.sillon38.com\/?p=39412"},"modified":"2013-08-27T22:01:15","modified_gmt":"2013-08-27T20:01:15","slug":"mortalite-des-huitres-ou-en-est-on","status":"publish","type":"post","link":"https:\/\/www.sillon38.com\/blog\/2013\/08\/27\/mortalite-des-huitres-ou-en-est-on\/","title":{"rendered":"Mortalit\u00e9 des hu\u00eetres : o\u00f9 en est-on ?"},"content":{"rendered":"<p><span style=\"color: #000080;\"><strong>Pour la deuxi\u00e8me ann\u00e9e cons\u00e9cutive, les ostr\u00e9iculteurs  fran\u00e7ais doivent faire face \u00e0 une surmortalit\u00e9 importante de leur  cheptel, particuli\u00e8rement en p\u00e9riode estivale. Le point sur la  situation.<\/strong><\/span><\/p>\n<p><span style=\"color: #000080;\"> <\/span><\/p>\n<p><span style=\"color: #000080;\"> <img loading=\"lazy\" decoding=\"async\" style=\"height: 302px; width: 455px;\" title=\"Mortalit\u00e9 des hu\u00eetres : o\u00f9 en est-on ? \" src=\"http:\/\/alimentation.gouv.fr\/local\/cache-vignettes\/L455xH302\/huitre455_cle86dbab-1a0b4.jpg\" alt=\"Mortalit\u00e9 des hu\u00eetres : o\u00f9 en est-on ? \" width=\"455\" height=\"302\" \/><\/span><\/p>\n<p><span style=\"color: #000080;\"><br \/>\n<strong>Dans les bassins ostr\u00e9icoles, deux agents pathog\u00e8nes s\u00e9vissent<\/strong> plus particuli\u00e8rement. Le virus OsHV-1, identifi\u00e9 depuis 2008, est  consid\u00e9r\u00e9 comme l\u2019organisme pr\u00e9pond\u00e9rant \u00e0 l\u2019origine des mortalit\u00e9s chez  les naissains, les hu\u00eetres de moins d\u2019un an. La bact\u00e9rie Vibrio  aesturianus s\u2019attaque quant \u00e0 elle aux hu\u00eetres adultes. D\u00e9j\u00e0 d\u00e9tect\u00e9e \u00e0  l\u2019\u00e9t\u00e9 2012, elle est cette ann\u00e9e particuli\u00e8rement virulente. Sans danger  pour l\u2019homme, ces deux organismes induisent pour les ostr\u00e9iculteurs des  pertes pouvant atteindre 65\u00a0% d\u2019un \u00e9levage.<\/span><\/p>\n<p><span style=\"color: #000080;\"> <\/span><\/p>\n<p><span style=\"color: #000080;\"><strong>Les conditions climatiques particuli\u00e8res du printemps-\u00e9t\u00e9 2013<\/strong> sont l\u2019un des facteurs retenus pour  expliquer cet \u00e9pisode de  surmortalit\u00e9\u00a0: les fortes pr\u00e9cipitations du printemps et le brusque  \u00e9cart de temp\u00e9ratures du d\u00e9but de l\u2019\u00e9t\u00e9 pourraient avoir favoris\u00e9 la  prolif\u00e9ration de Vibrio aesturianus.<\/span><\/p>\n<p><span style=\"color: #000080;\"> <\/span><\/p>\n<p><span style=\"color: #000080;\"><strong>Face \u00e0 cette situation, les services de l\u2019\u00c9tat et de  l\u2019Ifremer (l\u2019Institut fran\u00e7ais de recherche pour l\u2019exploitation de la  mer) se mobilisent.<\/strong> Afin de lutter au mieux contre les causes  de mortalit\u00e9 des hu\u00eetres, une surveillance a \u00e9t\u00e9 mise en place,  permettant de faire remonter les informations depuis les exploitations  touch\u00e9es\u00a0: alert\u00e9s par les ostr\u00e9iculteurs, les services d\u00e9concentr\u00e9s de  l\u2019\u00c9tat saisissent l\u2019Ifremer dans le cadre d\u2019un r\u00e9seau ad hoc, le Repamo  (R\u00e9seau Pathologie des Mollusques).<\/span><\/p>\n<p><span style=\"color: #000080;\"> <\/span><\/p>\n<p><span style=\"color: #000080;\"><strong>Si les analyses men\u00e9es en laboratoire ont permis d\u2019identifier la souche bact\u00e9rienne<\/strong> active en 2013 comme identique \u00e0 celle pr\u00e9sente l\u2019an dernier, elle  n\u2019ont en revanche pas \u00e9tabli de diff\u00e9rence de sensibilit\u00e9 \u00e0 Vibrio  aesturianus entre les diff\u00e9rentes vari\u00e9t\u00e9s d\u2019hu\u00eetres. Ainsi, les hu\u00eetres  dites \u00ab\u00a0triplo\u00efdes\u00a0\u00bb, largement utilis\u00e9es depuis quelques ann\u00e9es par  les professionnels et pr\u00e9sentes sur les \u00e9tals tout au long de l\u2019ann\u00e9e,  se r\u00e9v\u00e8lent sensibles \u00e0 la bact\u00e9rie, au m\u00eame titre que les  \u00ab\u00a0diplo\u00efdes\u00a0\u00bb, issues de captages naturels ou d\u2019\u00e9closeries.<\/span><\/p>\n<p><span style=\"color: #000080;\"> <\/span><\/p>\n<p><span style=\"color: #000080;\"><strong>\u00c9lev\u00e9es en milieu aquatique ouvert, les hu\u00eetres ne peuvent \u00eatre ni trait\u00e9es ni vaccin\u00e9es.<\/strong> Il s\u2019agit donc de mettre en place des mesures pour limiter la  propagation de l\u2019infection. Lorsque des hausses de mortalit\u00e9 animale  sont observ\u00e9es, les transferts de naissains sont restreints. D\u2019autre  part, des pratiques d\u2019\u00e9levage adapt\u00e9es \u00e0 la situation (diversification  des productions, densit\u00e9&#8230;) sont encourag\u00e9es aupr\u00e8s des professionnels.  Enfin, une des cl\u00e9s se trouve sans doute dans la s\u00e9lection des esp\u00e8ces  et le d\u00e9veloppement d\u2019hu\u00eetres moins sensibles aux bact\u00e9ries et virus.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pour la deuxi\u00e8me ann\u00e9e cons\u00e9cutive, les ostr\u00e9iculteurs fran\u00e7ais doivent faire face \u00e0 une surmortalit\u00e9 importante de leur cheptel, particuli\u00e8rement en p\u00e9riode estivale. Le point sur la situation.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[57],"tags":[],"class_list":["post-39412","post","type-post","status-publish","format-standard","hentry","category-peche"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Mortalit\u00e9 des hu\u00eetres : o\u00f9 en est-on ? -<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.sillon38.com\/blog\/2013\/08\/27\/mortalite-des-huitres-ou-en-est-on\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mortalit\u00e9 des hu\u00eetres : o\u00f9 en est-on ? -\" \/>\n<meta property=\"og:description\" content=\"Pour la deuxi\u00e8me ann\u00e9e cons\u00e9cutive, les ostr\u00e9iculteurs fran\u00e7ais doivent faire face \u00e0 une surmortalit\u00e9 importante de leur cheptel, particuli\u00e8rement en p\u00e9riode estivale. 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