{"id":3633,"date":"2020-01-18T16:50:21","date_gmt":"2020-01-18T21:50:21","guid":{"rendered":"https:\/\/opemisca.com\/blog\/?p=3633"},"modified":"2020-01-18T16:50:21","modified_gmt":"2020-01-18T21:50:21","slug":"la-thermocline-brassage-des-eaux-et-le-deplacement-des-poissons","status":"publish","type":"post","link":"https:\/\/opemisca.com\/blog\/2020\/01\/18\/la-thermocline-brassage-des-eaux-et-le-deplacement-des-poissons\/","title":{"rendered":"La thermocline, brassage des eaux et le d\u00e9placement des poissons"},"content":{"rendered":"<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"3650\" data-permalink=\"https:\/\/opemisca.com\/blog\/2020\/01\/18\/la-thermocline-brassage-des-eaux-et-le-deplacement-des-poissons\/lac-2\/\" data-orig-file=\"https:\/\/i0.wp.com\/opemisca.com\/blog\/wp-content\/uploads\/2020\/01\/lac.png?fit=1200%2C630&amp;ssl=1\" data-orig-size=\"1200,630\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"lac\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/i0.wp.com\/opemisca.com\/blog\/wp-content\/uploads\/2020\/01\/lac.png?fit=300%2C158&amp;ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/opemisca.com\/blog\/wp-content\/uploads\/2020\/01\/lac.png?fit=980%2C515&amp;ssl=1\" class=\"size-medium wp-image-3650 aligncenter\" src=\"https:\/\/i0.wp.com\/opemisca.com\/blog\/wp-content\/uploads\/2020\/01\/lac.png?resize=300%2C158&#038;ssl=1\" alt=\"\" width=\"300\" height=\"158\" srcset=\"https:\/\/i0.wp.com\/opemisca.com\/blog\/wp-content\/uploads\/2020\/01\/lac.png?resize=300%2C158&amp;ssl=1 300w, https:\/\/i0.wp.com\/opemisca.com\/blog\/wp-content\/uploads\/2020\/01\/lac.png?resize=1024%2C538&amp;ssl=1 1024w, https:\/\/i0.wp.com\/opemisca.com\/blog\/wp-content\/uploads\/2020\/01\/lac.png?resize=768%2C403&amp;ssl=1 768w, https:\/\/i0.wp.com\/opemisca.com\/blog\/wp-content\/uploads\/2020\/01\/lac.png?resize=416%2C218&amp;ssl=1 416w, https:\/\/i0.wp.com\/opemisca.com\/blog\/wp-content\/uploads\/2020\/01\/lac.png?w=1200&amp;ssl=1 1200w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>Les poissons se d\u00e9placent dans le plan d&rsquo;eau pour plusieurs raisons, entre autre la fraie, la nourriture,la luminosit\u00e9, la temp\u00e9rature de l&rsquo;eau et le niveau d&rsquo;oxyg\u00e8ne dissout dans l&rsquo;eau. Dans ce court expos\u00e9 nous allons tenter de traiter de ces deux derni\u00e8res raisons. Bien \u00e9videmment tout au long de l&rsquo;ann\u00e9e les poissons cherchent leur zone de confort; celle ci varie selon l&rsquo;esp\u00e8ce puisque leur temperature pr\u00e9f\u00e9rentielle varie fortement d&rsquo;une esp\u00e8ce \u00e0 l&rsquo;autre; de plus certaine esp\u00eace sont plus tol\u00e9rante au bas taux d&rsquo;oxyg\u00e8ne dissout. Bien \u00e9videmment cette zone sp\u00e9cifique a avantage d&rsquo;\u00eatre relativement proche d&rsquo;une aire d&rsquo;alimentation.<\/p>\n<p>Par exemple un lac de profondeur moyenne, pour faire tr\u00e8s simple se compose de diff\u00e9rentes couches d&rsquo;eau qui \u00e0 des moments pr\u00e9cis de la saison sont \u00e0 des temp\u00e9ratures bien diff\u00e9rentes et contiennent un taux d&rsquo;oxyg\u00e8ne dissout diff\u00e9rent. Un brassage des ces couches d&rsquo;eau s&rsquo;effectue deux fois par an sois au printemps et \u00e0 l&rsquo;automne; ce qui a pour effet de redistribuer l&rsquo;oxygene dans tout le plan d&rsquo;eau. Ce brassage d&rsquo;eau est possible grace \u00e0 une propri\u00e9t\u00e9 unique de l&rsquo;eau quand sa temp\u00e9rature passe sous les 4 degr\u00e9s celcius celle ci devient plus l\u00e9g\u00e8re ce qui explique pourquoi en hiver l&rsquo;eau est plus chaude dans les profondeurs et qu&rsquo;elle y est g\u00e9n\u00e9ralement \u00e0 4 degr\u00e9s celcius. Ces couches se nomment respectivement pour la couche de surface l&rsquo;\u00e9pilimnion<b>\u00a0<\/b>la couche de fond hypolimnion et elle sont s\u00e9par\u00e9 par une couche qui emp\u00eache presque tout \u00e9change d&rsquo;oxyg\u00e8ne et de temperatures qu&rsquo;on nomme thermocline ou m\u00e9talimnion. La thermocline n&rsquo;\u00e9tant pr\u00e9sente que l&rsquo;\u00e9t\u00e9 et l&rsquo;hiver et ce dans les plans d&rsquo;eau ou la profondeur le permet. Donc la temp\u00e9rature de l&rsquo;eau dans les profondeurs de ces lacs est autour de 4 degr\u00e9s celcius en \u00e9t\u00e9 et aussi en hiver, par contre en \u00e9t\u00e9 elle sera plus chaude en surface mais en hiver ce sera le contraire elle sera plus froide en surface.<\/p>\n<p>De quel facon se dissout l&rsquo;oxyg\u00e8ne dans l&rsquo;eau ?? La principale m\u00e9thode de dissolution est par l&rsquo;action des vagues et du vent puisque ces derni\u00e8res augmentent la surface de contact entre l&rsquo;eau et l&rsquo;air, les tributaires qui ont des eaux rapides contribuent eux aussi \u00e0 sa dissolution. La solubilit\u00e9 de l&rsquo;oxyg\u00e8ne varie en fonction de la temp\u00e9rature de l&rsquo;eau ainsi que de la pression atmosph\u00e9rique. Les eaux froide contiennent ainsi plus d&rsquo;oxyg\u00e8ne dissoute que les eaux chaude. La pression diminuant en altitude le taux d&rsquo;oxyg\u00e8ne dissout diminue lui aussi. Le ph\u00e9nom\u00e8ne de photosynth\u00e8se influence lui aussi le taux d&rsquo;oxyg\u00e8ne pr\u00e9sent dans l&rsquo;eau. Pour vulgariser, les algues tout comme les plantes respirent, elles absorbent donc du co2 et \u00e9mettent de l&rsquo;oxyg\u00e8ne pendant le jour, la nuit la respiration continu mais l&rsquo;absence de soleil emp\u00eache la photoshyth\u00e8se donc la plante relache du co2; toutefois l&rsquo;\u00e9mission d&rsquo;oxyg\u00e8ne le jour est sup\u00e9rieur au relachement de co2 la nuit. Les phytoplancton sont eux aussi reli\u00e9 au ph\u00e9nom\u00e8ne de la photosynth\u00e8se.<\/p>\n<p>Dans ce cas pourquoi les lacs qui sont envahie par les algues deviennent peu oxyg\u00e8n\u00e9 et que le ph\u00e9nom\u00e8ne d&rsquo;eutrophisation s&rsquo;accentue?? Pour plusieurs raisons, la d\u00e9compositions de ces v\u00e9g\u00e9taux relache du co2 et provoque une accumulation de s\u00e9diment, suite \u00e0 ca l&rsquo;eau devient moin translucide, elle devient donc plus chaude et le brassage des eaux devient moin efficace et le plan d&rsquo;eau fini par s&rsquo;eutrophiser.<\/p>\n<p>Parlant d&rsquo;eutrophisation nous allons couvrir le sujet des stade trophique des lacs et la composition physico-chimique de l&rsquo;eau dans un autre article, restez \u00e0 l&rsquo;affut.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; Les poissons se d\u00e9placent dans le plan d&rsquo;eau pour plusieurs raisons, entre autre la fraie, la nourriture,la luminosit\u00e9, la temp\u00e9rature de l&rsquo;eau et le niveau d&rsquo;oxyg\u00e8ne dissout dans l&rsquo;eau. Dans ce court expos\u00e9 nous allons tenter de traiter de ces deux derni\u00e8res raisons. Bien \u00e9videmment tout au long de l&rsquo;ann\u00e9e les poissons cherchent leur [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[6],"tags":[],"class_list":["post-3633","post","type-post","status-publish","format-standard","hentry","category-technique"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>La thermocline, brassage des eaux et le d\u00e9placement des poissons - Les Leurres Op\u00e9misca<\/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:\/\/opemisca.com\/blog\/2020\/01\/18\/la-thermocline-brassage-des-eaux-et-le-deplacement-des-poissons\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La thermocline, brassage des eaux et le d\u00e9placement des poissons - Les Leurres Op\u00e9misca\" \/>\n<meta property=\"og:description\" content=\"&nbsp; Les poissons se d\u00e9placent dans le plan d&rsquo;eau pour plusieurs raisons, entre autre la fraie, la nourriture,la luminosit\u00e9, la temp\u00e9rature de l&rsquo;eau et le niveau d&rsquo;oxyg\u00e8ne dissout dans l&rsquo;eau. Dans ce court expos\u00e9 nous allons tenter de traiter de ces deux derni\u00e8res raisons. Bien \u00e9videmment tout au long de l&rsquo;ann\u00e9e les poissons cherchent leur [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/opemisca.com\/blog\/2020\/01\/18\/la-thermocline-brassage-des-eaux-et-le-deplacement-des-poissons\/\" \/>\n<meta property=\"og:site_name\" content=\"Les Leurres Op\u00e9misca\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/lesleurresopemisca\/\" \/>\n<meta property=\"article:published_time\" content=\"2020-01-18T21:50:21+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/opemisca.com\/blog\/wp-content\/uploads\/2020\/01\/lac-300x158.png\" \/>\n<meta name=\"author\" content=\"Pierre\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Pierre\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/opemisca.com\/blog\/2020\/01\/18\/la-thermocline-brassage-des-eaux-et-le-deplacement-des-poissons\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/opemisca.com\/blog\/2020\/01\/18\/la-thermocline-brassage-des-eaux-et-le-deplacement-des-poissons\/\"},\"author\":{\"name\":\"Pierre\",\"@id\":\"https:\/\/opemisca.com\/blog\/#\/schema\/person\/86e5ef84ee093f8929f1d09776e46259\"},\"headline\":\"La thermocline, brassage des eaux et le d\u00e9placement des poissons\",\"datePublished\":\"2020-01-18T21:50:21+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/opemisca.com\/blog\/2020\/01\/18\/la-thermocline-brassage-des-eaux-et-le-deplacement-des-poissons\/\"},\"wordCount\":689,\"commentCount\":3,\"publisher\":{\"@id\":\"https:\/\/opemisca.com\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/opemisca.com\/blog\/2020\/01\/18\/la-thermocline-brassage-des-eaux-et-le-deplacement-des-poissons\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/opemisca.com\/blog\/wp-content\/uploads\/2020\/01\/lac-300x158.png\",\"articleSection\":[\"Technique\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/opemisca.com\/blog\/2020\/01\/18\/la-thermocline-brassage-des-eaux-et-le-deplacement-des-poissons\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/opemisca.com\/blog\/2020\/01\/18\/la-thermocline-brassage-des-eaux-et-le-deplacement-des-poissons\/\",\"url\":\"https:\/\/opemisca.com\/blog\/2020\/01\/18\/la-thermocline-brassage-des-eaux-et-le-deplacement-des-poissons\/\",\"name\":\"La thermocline, brassage des eaux et le d\u00e9placement des poissons - 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