{"id":6380,"date":"2026-05-21T08:33:32","date_gmt":"2026-05-21T06:33:32","guid":{"rendered":"https:\/\/lesminis.fr\/blog\/?p=6380"},"modified":"2026-05-22T11:19:56","modified_gmt":"2026-05-22T09:19:56","slug":"poissons-migrateurs-declin-rivieres-saumon-anguille-esturgeon","status":"publish","type":"post","link":"https:\/\/lesminis.fr\/blog\/poissons-migrateurs-declin-rivieres-saumon-anguille-esturgeon\/","title":{"rendered":"Poissons migrateurs : ces grands voyageurs des rivi\u00e8res qui disparaissent"},"content":{"rendered":"<p>Saumon atlantique, anguille europ\u00e9enne, alose, lamproie, esturgeon : tous ces animaux ont un point commun. Ils parcourent parfois des milliers de kilom\u00e8tres entre rivi\u00e8res et oc\u00e9ans pour grandir, se nourrir ou se reproduire. Ce sont les <strong>poissons migrateurs<\/strong>. Et depuis 1970, les populations suivies de ces esp\u00e8ces d&rsquo;eau douce ont chut\u00e9 de 81 % \u00e0 l&rsquo;\u00e9chelle mondiale. Voici qui ils sont et ce que dit la science aujourd&rsquo;hui.<\/p>\n<p>&nbsp;<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_83 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/lesminis.fr\/blog\/poissons-migrateurs-declin-rivieres-saumon-anguille-esturgeon\/#Qui_sont_les_poissons_migrateurs\" >Qui sont les poissons migrateurs ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/lesminis.fr\/blog\/poissons-migrateurs-declin-rivieres-saumon-anguille-esturgeon\/#Une_chute_de_81_en_50_ans\" >Une chute de 81 % en 50 ans<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/lesminis.fr\/blog\/poissons-migrateurs-declin-rivieres-saumon-anguille-esturgeon\/#Trois_especes_emblematiques_en_difficulte\" >Trois esp\u00e8ces embl\u00e9matiques en difficult\u00e9<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/lesminis.fr\/blog\/poissons-migrateurs-declin-rivieres-saumon-anguille-esturgeon\/#Languille_europeenne\" >L&rsquo;anguille europ\u00e9enne<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/lesminis.fr\/blog\/poissons-migrateurs-declin-rivieres-saumon-anguille-esturgeon\/#Le_saumon_atlantique\" >Le saumon atlantique<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/lesminis.fr\/blog\/poissons-migrateurs-declin-rivieres-saumon-anguille-esturgeon\/#Les_esturgeons\" >Les esturgeons<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/lesminis.fr\/blog\/poissons-migrateurs-declin-rivieres-saumon-anguille-esturgeon\/#Pourquoi_disparaissent-ils\" >Pourquoi disparaissent-ils ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/lesminis.fr\/blog\/poissons-migrateurs-declin-rivieres-saumon-anguille-esturgeon\/#Decouvrir_les_poissons_migrateurs_avec_des_figurines\" >D\u00e9couvrir les poissons migrateurs avec des figurines<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/lesminis.fr\/blog\/poissons-migrateurs-declin-rivieres-saumon-anguille-esturgeon\/#Sources\" >Sources<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Qui_sont_les_poissons_migrateurs\"><\/span>Qui sont les poissons migrateurs ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Un poisson migrateur est une esp\u00e8ce qui change de milieu de vie \u00e0 diff\u00e9rentes \u00e9tapes de son existence. Certains naissent en eau douce, grandissent en mer et reviennent en rivi\u00e8re pour se reproduire : c&rsquo;est le mode de vie dit anadrome, illustr\u00e9 par le saumon, l&rsquo;alose ou la lamproie marine. D&rsquo;autres font l&rsquo;inverse, comme l&rsquo;anguille europ\u00e9enne, qui na\u00eet en mer et grandit en rivi\u00e8re (mode catadrome). Ces voyages peuvent atteindre plusieurs milliers de kilom\u00e8tres et durer plusieurs ann\u00e9es.<\/p>\n<p>Cette strat\u00e9gie est risqu\u00e9e mais permet aux esp\u00e8ces d&rsquo;exploiter deux habitats tr\u00e8s diff\u00e9rents au cours de leur vie. Elle n\u00e9cessite cependant une condition essentielle : la libre circulation entre la mer et les rivi\u00e8res. Sans ce passage, le cycle s&rsquo;effondre.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Une_chute_de_81_en_50_ans\"><\/span>Une chute de 81 % en 50 ans<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Selon le Living Planet Index 2024 d\u00e9di\u00e9 aux poissons migrateurs d&rsquo;eau douce, les populations suivies ont diminu\u00e9 de 81 % entre 1970 et 2020. Ce chiffre est issu d&rsquo;un programme de suivi international qui compile des donn\u00e9es sur plusieurs centaines de populations \u00e0 travers le monde. Le constat est particuli\u00e8rement marqu\u00e9 dans les rivi\u00e8res europ\u00e9ennes, o\u00f9 certaines esp\u00e8ces embl\u00e9matiques se trouvent aujourd&rsquo;hui en grande difficult\u00e9.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Trois_especes_emblematiques_en_difficulte\"><\/span>Trois esp\u00e8ces embl\u00e9matiques en difficult\u00e9<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Languille_europeenne\"><\/span>L&rsquo;anguille europ\u00e9enne<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>L&rsquo;anguille europ\u00e9enne (<em>Anguilla anguilla<\/em>) est l&rsquo;un des poissons les plus myst\u00e9rieux d&rsquo;Europe. Elle se reproduit dans la mer des Sargasses, au large des Bermudes, puis ses larves traversent l&rsquo;Atlantique pendant deux \u00e0 trois ans pour rejoindre les rivi\u00e8res europ\u00e9ennes. Elle est aujourd&rsquo;hui class\u00e9e en danger critique d&rsquo;extinction par l&rsquo;UICN. Selon les indicateurs utilis\u00e9s, ses effectifs ont diminu\u00e9 de plus de 90 % depuis les ann\u00e9es 1980.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Le_saumon_atlantique\"><\/span>Le saumon atlantique<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Le saumon atlantique (<em>Salmo salar<\/em>) na\u00eet en rivi\u00e8re, descend vers l&rsquo;oc\u00e9an o\u00f9 il passe une \u00e0 plusieurs ann\u00e9es, puis remonte parfois jusqu&rsquo;\u00e0 3 000 kilom\u00e8tres pour se reproduire dans sa rivi\u00e8re natale. En Grande-Bretagne, il est d\u00e9sormais class\u00e9 \u00ab en danger \u00bb sur la Liste rouge UICN. Au niveau mondial, son statut est pass\u00e9 \u00e0 \u00ab quasi menac\u00e9 \u00bb.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Les_esturgeons\"><\/span>Les esturgeons<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Les esturgeons figurent parmi les groupes animaux les plus menac\u00e9s au monde. Selon l&rsquo;\u00e9valuation UICN 2022, 17 esp\u00e8ces sur les 27 connues sont en danger critique d&rsquo;extinction. Ces poissons pr\u00e9historiques, dont la lign\u00e9e existe depuis plus de 200 millions d&rsquo;ann\u00e9es, font face \u00e0 un d\u00e9clin sans pr\u00e9c\u00e9dent dans les fleuves d&rsquo;Europe, d&rsquo;Asie et d&rsquo;Am\u00e9rique du Nord.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Pourquoi_disparaissent-ils\"><\/span>Pourquoi disparaissent-ils ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>La cause principale est la fragmentation des rivi\u00e8res. En Europe, plus d&rsquo;un million d&rsquo;obstacles (barrages hydro\u00e9lectriques, seuils agricoles, anciens moulins parfois oubli\u00e9s depuis des si\u00e8cles) coupent encore les cours d&rsquo;eau. Un poisson migrateur qui ne peut plus remonter sa rivi\u00e8re pour se reproduire ne peut plus accomplir son cycle de vie, m\u00eame s&rsquo;il survit individuellement. \u00c0 cela s&rsquo;ajoutent la pollution chimique des eaux, la surp\u00eache dans certaines zones marines et le r\u00e9chauffement climatique qui modifie la temp\u00e9rature des fleuves, perturbant les rep\u00e8res thermiques utilis\u00e9s par ces poissons pour orienter leurs migrations.<\/p>\n<p>Des dispositifs comme les passes \u00e0 poissons ou la suppression d&rsquo;obstacles inutiles permettent depuis quelques ann\u00e9es de restaurer certains tron\u00e7ons de rivi\u00e8res. Ces actions montrent que la situation n&rsquo;est pas fig\u00e9e. Pour illustration, plusieurs centaines d&rsquo;obstacles sont retir\u00e9s chaque ann\u00e9e dans les rivi\u00e8res europ\u00e9ennes.<\/p>\n<p>D&rsquo;autres animaux ont connu des destins similaires sur des \u00eeles isol\u00e9es, comme l&rsquo;illustrent les <a href=\"https:\/\/lesminis.fr\/blog\/especes-lazare-9-animaux-eteints-redecouverts-vivants\/\">9 esp\u00e8ces Lazare<\/a> que la science avait d\u00e9clar\u00e9es \u00e9teintes avant de les retrouver vivantes des d\u00e9cennies plus tard.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Decouvrir_les_poissons_migrateurs_avec_des_figurines\"><\/span>D\u00e9couvrir les poissons migrateurs avec des figurines<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Pour faire d\u00e9couvrir aux enfants le voyage extraordinaire du saumon entre rivi\u00e8re et oc\u00e9an, le <a href=\"https:\/\/lesminis.fr\/cycle-de-vie-saumon-figurines-educatives-safari-ltd-100267\/3419.html\">set cycle de vie du saumon Safari Ltd<\/a> rassemble 5 figurines p\u00e9dagogiques repr\u00e9sentant chaque \u00e9tape, de l&rsquo;\u0153uf \u00e0 l&rsquo;adulte. La <a href=\"https:\/\/lesminis.fr\/figurine-saumon-safari-ltd-100205\/7275.html\">figurine de saumon adulte Safari Ltd<\/a> compl\u00e8te parfaitement ce support. Pour aller plus loin sur la faune aquatique, consultez aussi notre <a href=\"https:\/\/lesminis.fr\/blog\/animaux-marins\/\">guide complet des animaux marins<\/a>.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Sources\"><\/span>Sources<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>Living Planet Index for Migratory Freshwater Fishes (2024), World Fish Migration Foundation et Zoological Society of London<\/li>\n<li><a href=\"https:\/\/www.iucnredlist.org\/\" target=\"_blank\" rel=\"noopener\">IUCN Red List of Threatened Species<\/a> (2022-2024)<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Le saumon, l&rsquo;anguille, l&rsquo;esturgeon : ces grands voyageurs des rivi\u00e8res parcourent parfois des milliers de kilom\u00e8tres entre mer et eau douce. Aujourd&rsquo;hui, leur monde est coup\u00e9 en morceaux.<\/p>\n","protected":false},"author":1,"featured_media":6381,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1600,28],"tags":[2650,2653,2651,2652,2655,2648,2654,2649],"class_list":["post-6380","post","type-post","status-publish","format-standard","has-post-thumbnail","category-actualites-culture-et-curiosites","category-monde-animal-figurines","tag-anguille-europeenne","tag-biodiversite-aquatique","tag-esturgeon","tag-journee-mondiale-poissons-migrateurs","tag-living-planet-index","tag-poissons-migrateurs","tag-rivieres-europe","tag-saumon-atlantique"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.6 (Yoast SEO v27.6) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Poissons migrateurs : -81 % depuis 1970, ce que dit la science | LesMinis<\/title>\n<meta name=\"description\" content=\"Saumon, anguille, esturgeon : les populations de poissons migrateurs d&#039;eau douce ont chut\u00e9 de 81 % en 50 ans. 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