{"id":1630,"date":"2014-05-12T14:31:31","date_gmt":"2014-05-12T14:31:31","guid":{"rendered":"http:\/\/www.123fakta.com\/da\/?p=1630"},"modified":"2026-03-19T10:38:28","modified_gmt":"2026-03-19T10:38:28","slug":"fakta-om-hajer","status":"publish","type":"post","link":"https:\/\/www.123fakta.com\/da\/facts-about-sharks","title":{"rendered":"Fakta om hajer"},"content":{"rendered":"<ol>\n<li><strong>Lugtesans:<\/strong>\u00a0Hajer har en ekstremt skarp lugtesans og kan lugte blod p\u00e5 lang afstand. Den n\u00f8jagtige afstand kan v\u00e6re mellem 400 m og 2 km, afh\u00e6ngigt af hajarten og vandforholdene. 2\/3 af en hajs hjerne er dedikeret til dens lugtesans<\/li>\n<li><strong>Synker:<\/strong> Hvis en haj holder op med at sv\u00f8mme, synker den til bunds. Nogle hajarter d\u00f8r, hvis de ikke sv\u00f8mmer, fordi deres liv afh\u00e6nger af, at der konstant str\u00f8mmer vand gennem deres g\u00e6ller (hvilket kun sker, n\u00e5r de drives frem gennem vandet).<\/li>\n<li><strong>400 millioner \u00e5r:<\/strong>\u00a0Hajer har eksisteret uden de store forandringer i de sidste 400 millioner \u00e5r - hvilket betyder, at de var her l\u00e6nge f\u00f8r <a href=\"https:\/\/www.123fakta.com\/da\/fakta-om-dinosaurer\/\">Dinosaurer<\/a> ankommet<\/li>\n<li><strong>Isbj\u00f8rnespisere:<\/strong>\u00a0Gr\u00f8nlandshajen (ogs\u00e5 kaldet 'merman' eller 'Somniosus microcephalus') lever af <a href=\"https:\/\/www.123fakta.com\/da\/fakta-om-isbjorne\/\">isbj\u00f8rne<\/a> og kan leve i op til 200 \u00e5r<\/li>\n<li><strong>Tigerhajer:<\/strong>\u00a0S\u00e5 snart tigerhaj-embryoner udvikler t\u00e6nder, angriber de deres s\u00f8skende og spiser hinanden (mens de stadig er i deres mors mave). Det er n\u00f8dvendigt, for at embryonerne kan vokse. Da tigerhajen har to livm\u00f8dre, er der kun to embryoner tilbage ved f\u00f8dslen.<\/li>\n<li><strong>Acceleration:<\/strong>\u00a0Den kortfinnede makohaj kan accelerere hurtigere end en Porsche<\/li>\n<li><strong>Tyrehajer:<\/strong>\u00a0Tyrehajen kan leve b\u00e5de i saltvand og ferskvand.<\/li>\n<li><strong>St\u00f8rste hajer:<\/strong>\u00a0Verdens to st\u00f8rste hajer, hvalhajen og brugden, er harml\u00f8se plankton\u00e6dere.<\/li>\n<li><strong>Den mindste haj:<\/strong>\u00a0Verdens mindste haj, pygm\u00e6hajen, er kun 15 cm lang som voksen.<\/li>\n<li><strong>T\u00e6nder:<\/strong>\u00a0Den store hvide haj kan tabe op til 1.000 t\u00e6nder p\u00e5 et \u00e5r. Til sammenligning tager det mennesker 7 \u00e5r at tabe 20 t\u00e6nder. Det tager s\u00e5 lidt som 3 dage at erstatte en tand, der er faldet ud. I l\u00f8bet af en hajs levetid kan der vokse op til 30.000 t\u00e6nder i dens k\u00e6ber.<\/li>\n<\/ol>\n<figure id=\"attachment_7530\" aria-describedby=\"caption-attachment-7530\" style=\"width: 790px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-7530\" src=\"https:\/\/www.123fakta.com\/wp-content\/uploads\/hajer-fakta-2.jpg\" alt=\"Fakta: Hajer dr\u00e6ber langt f\u00e6rre mennesker om \u00e5ret, end de fleste tror.\" width=\"800\" height=\"600\" srcset=\"https:\/\/www.123fakta.com\/wp-content\/uploads\/hajer-fakta-2.jpg 800w, https:\/\/www.123fakta.com\/wp-content\/uploads\/hajer-fakta-2-300x225.jpg 300w, https:\/\/www.123fakta.com\/wp-content\/uploads\/hajer-fakta-2-768x576.jpg 768w, https:\/\/www.123fakta.com\/wp-content\/uploads\/hajer-fakta-2-16x12.jpg 16w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-7530\" class=\"wp-caption-text\">Navngivelse: Allan Lee - Flickr.com<\/figcaption><\/figure>\n<p style=\"text-align: center;\"><em><strong>Fakta: Hajer dr\u00e6ber 12 mennesker hvert \u00e5r - mennesker dr\u00e6ber 11.417 hajer hver time.<\/strong><\/em><\/p>\n<h2>Fakta om gr\u00f8nlandshajer<\/h2>\n<ul>\n<li><strong>Alder<\/strong>: I\u00a0<a href=\"http:\/\/videnskab.dk\/naturvidenskab\/verdens-aeldste-hvirveldyr-groenlandshaj-blev-op-mod-512-aar-gammel\">en unders\u00f8gelse fra 2016<\/a> I et studie fra 2016 estimerede man den \u00e6ldste nulevende gr\u00f8nlandshaj til at v\u00e6re mellem 272 og 512 \u00e5r gammel (man kan ikke pr\u00e6cist m\u00e5le gr\u00f8nlandshajens alder). Gr\u00f8nlandshajernes h\u00f8je levealder g\u00f8r dem sandsynligvis til klodens l\u00e6ngstlevende hvirveldyr. F\u00f8r opdagelsen af gr\u00f8nlandshajens lange levealder, var det en 211 \u00e5rig gr\u00f8nlandshval, der havde rekorden som verdens \u00e6ldste hvirveldyr.<\/li>\n<li><strong>K\u00f8nsmodenhed<\/strong>: Alder ved k\u00f8nsmodenhed: Gr\u00f8nlandshajer bliver k\u00f8nsmodne, n\u00e5r de er omkring 100 \u00e5r gamle (hunner bliver f\u00f8rst k\u00f8nsmodne, n\u00e5r de er omkring 4 meter lange). De er normalt k\u00f8nsmodne, n\u00e5r de er omkring 150 \u00e5r.<\/li>\n<\/ul>\n<h2>Flere fakta om hajer<\/h2>\n<ul>\n<li><strong>Skelet:<\/strong>\u00a0Hajer har ingen knogler, da deres skelet udelukkende er lavet af brusk. N\u00e5r hajer d\u00f8r, bliver deres kroppe helt opl\u00f8st af vandet, og kun deres t\u00e6nder er tilbage.<\/li>\n<li><strong>F\u00f8de:<\/strong>\u00a0En fuldvoksen hvidhaj kan overleve i 3 m\u00e5neder uden at spise.<\/li>\n<li><strong>K\u00f8d\u00e6dere:<\/strong>\u00a0Der findes ingen plante\u00e6dende hajer<\/li>\n<li><strong>Skarpe t\u00e6nder:<\/strong>\u00a0Tigerhajens t\u00e6nder er s\u00e5 skarpe, at de kan sk\u00e6re gennem en havskildpaddes skal<\/li>\n<li><strong>Kr\u00e6ft:<\/strong>\u00a0Forskere unders\u00f8ger hajbrusk for mulige kr\u00e6ftkure, fordi hajer sj\u00e6ldent f\u00e5r kr\u00e6ft<\/li>\n<li><strong>Arter:<\/strong>\u00a0Der findes mindst 500 hajarter i verden.<\/li>\n<li><strong>Overfiskeri:<\/strong>\u00a0Overfiskeri kan have alvorlige konsekvenser for hajer. Hvalhajen kan for eksempel ikke formere sig f\u00f8r sit 30. leve\u00e5r, og dens samlede levetid er 60-100 \u00e5r. Derfor kan de ikke reproducere sig hurtigt nok til at opveje den nedgang i bestanden, som fiskeriet for\u00e5rsager.<\/li>\n<li><strong>Fobi:<\/strong>\u00a0\"Galeofobi\" er frygten for hajer. Udtrykket kommer fra det gr\u00e6ske ord \"galeos\", der betyder \"hundestejle, lille haj\" og var navnet p\u00e5 en bestemt type haj med hvallignende tr\u00e6k...<\/li>\n<li><strong>Alder<\/strong>: Hajer lever generelt 2-3 gange den alder, hvor de bliver k\u00f8nsmodne. S\u00e5 hvis en haj bliver k\u00f8nsmoden, n\u00e5r den er 70 \u00e5r gammel, kan den blive 140-210 \u00e5r gammel.<\/li>\n<li><strong>V\u00e6kst<\/strong>: I mods\u00e6tning til pattedyr, der holder op med at vokse i en vis alder, vokser hajer - ligesom <a href=\"https:\/\/www.123fakta.com\/da\/fakta-om-fisk\/\">fisk<\/a> - forts\u00e6tte med at vokse hele livet.<\/li>\n<\/ul>\n<figure id=\"attachment_7531\" aria-describedby=\"caption-attachment-7531\" style=\"width: 990px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-7531\" src=\"https:\/\/www.123fakta.com\/wp-content\/uploads\/den-store-hvide-haj-2.jpg\" alt=\"Fakta: Den store hvide haj kan overleve i 3 m\u00e5neder uden mad.\" width=\"1000\" height=\"667\" srcset=\"https:\/\/www.123fakta.com\/wp-content\/uploads\/den-store-hvide-haj-2.jpg 1000w, https:\/\/www.123fakta.com\/wp-content\/uploads\/den-store-hvide-haj-2-300x200.jpg 300w, https:\/\/www.123fakta.com\/wp-content\/uploads\/den-store-hvide-haj-2-768x512.jpg 768w, https:\/\/www.123fakta.com\/wp-content\/uploads\/den-store-hvide-haj-2-18x12.jpg 18w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><figcaption id=\"caption-attachment-7531\" class=\"wp-caption-text\">Tilskrivning: Travelbag Ltd - Flickr.com<\/figcaption><\/figure>\n<p style=\"text-align: center;\"><em><strong>Fakta: Den store hvide haj kan overleve i op til 3 m\u00e5neder uden mad.<\/strong><\/em><\/p>\n<h2>Fakta om hajangreb<\/h2>\n<ul>\n<li><strong>Bide:<\/strong>\u00a0I de sj\u00e6ldne tilf\u00e6lde, hvor hajer angriber mennesker, bider de som regel kun \u00e9n gang. De holder som regel kun deres offer i et par sekunder, f\u00f8r det g\u00e5r op for dem, at det ikke er et havdyr, de har fanget.<\/li>\n<li><strong>Hajer mod mennesker:<\/strong>\u00a0Hajer dr\u00e6ber 12 mennesker hvert \u00e5r - mennesker dr\u00e6ber 11.417 hajer hver time<\/li>\n<li><strong>Menneskebid:<\/strong>\u00a0Det er mere sandsynligt, at du bliver bidt af et andet menneske end af en haj.<\/li>\n<li><strong>Kystangreb:<\/strong>\u00a0Langt de fleste hajangreb sker op til et par hundrede meter fra kysten. Men det skyldes udelukkende, at mennesker prim\u00e6rt sv\u00f8mmer t\u00e6t p\u00e5 kysten.<\/li>\n<li><strong>Lavvande:<\/strong>\u00a0Omkring 2\/3 af alle hajangreb sker p\u00e5 lavt vand (under 1,8 meters dybde).<\/li>\n<li><strong>Sandsynlighed:<\/strong>\u00a0Der er st\u00f8rre sandsynlighed for at d\u00f8 af en faldende kokosn\u00f8d end af et hajangreb. Der er ogs\u00e5 st\u00f8rre sandsynlighed for at d\u00f8 af et lynnedslag eller bistik end af et hajangreb.<\/li>\n<li><strong>Advarselstegn:<\/strong>\u00a0F\u00f8lgende er tegn p\u00e5, at en haj vil angribe: Den buer ryggen, s\u00e6nker brystfinnerne og sv\u00f8mmer i et zigzag-m\u00f8nster.<\/li>\n<li><strong>Mandlige ofre:<\/strong>\u00a0Selvom der sv\u00f8mmer n\u00e6sten lige mange m\u00e6nd og kvinder i verdenshavene, er omkring 90% af alle hajofre m\u00e6nd.<\/li>\n<li><strong>Kun f\u00e5 arter angriber:<\/strong>\u00a0Kun omkring 3% af alle hajarter har historisk set angrebet mennesker.<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Lugtesans: Hajer har en ekstremt skarp lugtesans og kan lugte blod p\u00e5 lang afstand. Den n\u00f8jagtige afstand kan v\u00e6re mellem 400 m og 2 km, afh\u00e6ngigt af hajarten og vandforholdene. 2\/3 af en hajs hjerne er dedikeret til dens lugtesans Synker: Hvis en haj holder op med at sv\u00f8mme, ... <a title=\"Fakta om hajer\" class=\"read-more\" href=\"https:\/\/www.123fakta.com\/da\/facts-about-sharks\" aria-label=\"L\u00e6s mere om fakta om hajer\">L\u00e6s Mere<\/a><\/p>","protected":false},"author":1,"featured_media":7532,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"cybocfi_hide_featured_image":"","footnotes":""},"categories":[67,74],"tags":[120],"class_list":["post-1630","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-animals","category-aquatic-animals","tag-adsense"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Facts about sharks and shark attacks - 31 amazing facts<\/title>\n<meta name=\"description\" content=\"Fact: Sharks sink to the bottom if they stop swimming. 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