{"id":2886,"date":"2025-02-14T09:53:58","date_gmt":"2025-02-14T09:53:58","guid":{"rendered":"https:\/\/improveaquaticlife.se\/improving-the-conservation-status-of-target-species\/"},"modified":"2025-06-25T12:23:00","modified_gmt":"2025-06-25T12:23:00","slug":"improving-the-conservation-status-of-target-species","status":"publish","type":"page","link":"https:\/\/improveaquaticlife.se\/en\/improving-the-conservation-status-of-target-species\/","title":{"rendered":"Improving the conservation status of target species"},"content":{"rendered":"

[vc_section background_position=”center center” css=”.vc_custom_1737552888011{background-image: url(https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2025\/01\/backdrop_projekt.jpg?id=1219) !important;background-position: center !important;background-repeat: no-repeat !important;background-size: cover !important;}” el_name=”Sidhuvud”][vc_row][vc_column]

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Improving the conservation status of target species<\/h1>\n <\/div>\n <\/div>\n [\/vc_column][\/vc_row][\/vc_section][vc_section][vc_row][vc_column][vc_column_text]<\/p>\n

Sea lamprey, freshwater pearl mussel and thick-shelled river mussel are all endangered species in Sweden. Through the Improve Aquatic LIFE<\/em> project, concrete actions are now being taken to improve their chances of survival – from restoring habitats and re-establishing reproductive cycles to using innovative methods such as e-DNA and mussel infestation. The work is done in close collaboration with landowners and organizations, with the goal of reversing a negative trend and restoring viable ecosystems. <\/strong><\/p>\n

Three of the project’s target species – Sea lamprey<\/a>, Freshwater<\/em> pearl mussel <\/a>(Margaritifera margaritifera<\/em>), and Thick-shelled river mussel<\/a> (Unio crassus<\/em>) – are currently\u00a0 endangered in Sweden (Red List 2015). Without targeted efforts, these species risk disappearing from our rivers. By creating special habitats for lamprey larvae and infesting host fish with mussel larvae, Improve Aquatic LIFE is actively working to reverse the negative trend.<\/p>\n

Background
\n<\/strong>The sea lamprey, an ancient fish species, has declined sharply and now reproduces in only a few southern Swedish rivers. The threats to the sea lamprey are many. It is prevented from reaching its spawning and nursery grounds by hydropower plants and dams. Channelization, dredging and ditching of rivers destroy larval habitats. In the sea, the lack of sufficient numbers and sizes of host fish is a major problem.<\/p>\n

Both the Freshwater pearl mussel and the thick-shelled river mussel are also enangered and their survival is affected by several factors: these mussels depend on specific host fish for reproduction but due to migration barriers and lost habitats, for both the mussels and their host fish, reproduction fails in many populations. Discharges of nutrients and pollutants from agriculture and industry contributes to eutrophication, leading to oxygen depletion and siltation of the riverbeds where mussels live.<\/p>\n

What is Improve Aquatic LIFE doing to improve conservation status?
\n<\/strong>The project implements concrete measures to improve the reproduction and living conditions for these three protected species. The work is carried out in close dialogue with landowners and in collaboration between several organizations.<\/p>\n

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Sea lamprey from H\u00f6gvads\u00e5n. Photo: Elisabeth Thysell.<\/p><\/div>\n

Two main focus areas
\n<\/strong> 1. Habitat restoration\u00a0 for the sea lamprey
\n<\/em>The goal is to improve\u00a0 habitats for the sea lamprey, and also river lamprey, in Vrams\u00e5n, River K\u00e4vlinge\u00e5n, Br\u00e5\u00e5n, River R\u00f6nne \u00e5 and River \u00c4tran by recreating nursery habitats for lamprey larvae. By recreating backwater, slow-flowing sections and sediment banks, the young larvae get shelter and food.<\/p>\n

Survey of abundance with e-DNA
\n<\/em>It is still unclear in which western Swedish rivers the sea lamprey occurs and whether the species manages to reproduce naturally. Therefore, we will use e-DNA analysis – a modern and non-invasive method – to map the species’ presence and identify potential new areas for measures.<\/p>\n

2. Infestation of host fish with mussel larvae
\n<\/em>To support the reproduction of the freshwater pearl mussel and the thick-shelled river mussel, we will infest suitable host fish with mussel larvae and release them in 17 rivers. This proven method has previously been successfully used in several LIFE projects. Infestation is preceded by thorough field studies to ensure that the correct host fish is infested with the correct mussel in the right environment. Combined with the removal of migration barriers and habitat restoration, these measures will help improve the conservation status of the freshwater pearl mussel and the thick-shelled river mussel.<\/p>\n

Results and benefits
\n<\/strong>The measures improve the conservation status of three of Swedens most endangered freshwater species. When lampreys and mussels regain functional life cycles, important ecosystem functions – such as filtration of particles, uptake of nutrients and stabilization of bottom sediments – are also restored. The project also contributes to new knowledge about these species, which may have implications for species conservation in a broader European context.<\/p>\n

[\/vc_column_text][\/vc_column][\/vc_row][\/vc_section][vc_section disable_element=”yes” css=”.vc_custom_1737553193343{background-color: #faf6eb !important;}” el_name=”Projekt sammanfattning”][vc_row][vc_column width=”1\/2″]

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From Halland’s weather island to the \u00d6resund<\/p>

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Eelgrass beds and artificial reefs<\/h2>

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed in volutpat nunc. Phasellus tincidunt vel metus sed ornare. Quisque blandit laoreet luctus. Pellentesque non dui vel augue ultricies commodo. Curabitur imperdiet ante nibh, ut hendrerit tortor pellentesque lacinia. Vestibulum vulputate rhoncus massa ac viverra. Proin lectus ex, maximus eu consequat eu, aliquet ac arcu. Curabitur et molestie tortor.<\/p>\n<\/div> <\/header>\n [\/vc_column][\/vc_row][vc_row][vc_column width=”1\/4″]

\n <\/i><\/span>
5,800<\/span><\/div>\n
Number of fish infested with river pearl mussel<\/div>\n <\/div>\n [\/vc_column][vc_column width=”1\/4″]
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3,000<\/span><\/div>\n
Number of fish infested with thick-shelled mussels<\/div>\n <\/div>\n [\/vc_column][\/vc_row][\/vc_section][vc_section disable_element=”yes” el_name=”Projektbeskrivning”][vc_row][vc_column][vc_column_text]Lorem ipsum dolor<\/strong> sit amet, consectetur adipiscing elit. Sed in volutpat nunc. Phasellus tincidunt vel metus sed ornare. Quisque blandit laoreet luctus. Pellentesque non dui vel augue ultricies commodo. Curabitur imperdiet ante nibh, ut hendrerit tortor pellentesque lacinia. Vestibulum vulputate rhoncus massa ac viverra. Proin lectus ex, maximus eu consequat eu, aliquet ac arcu. Curabitur et molestie tortor.<\/p>\n

Mauris eget egestas urna. Donec eget imperdiet justo, vitae consectetur ex. Morbi id nisl dictum, placerat felis eget, tristique erat. Morbi accumsan leo in elementum vehicula. Quisque at varius dolor. Donec scelerisque posuere maximus. Cras molestie lorem vitae ipsum ornare cursus. Donec a neque sit amet ante viverra imperdiet ut volutpat neque.<\/p>\n

Phasellus et lorem erat. Nulla felis neque, aliquam et arcu id, facilisis aliquet augue.<\/p><\/blockquote>\n

Aliquam et porttitor nisi. Nam bibendum orci in tellus aliquet, eu ullamcorper leo varius. Etiam at turpis a dui scelerisque luctus sit amet et massa. Proin eu varius orci. Donec facilisis massa id ipsum tincidunt, eu cursus sem pellentesque. Nam sit amet mauris eu lectus malesuada vestibulum. Aenean sed aliquam tortor, gravida facilisis est. Curabitur ultrices, risus vitae facilisis finibus, dui metus fermentum erat, non luctus sapien dolor ac lorem. Pellentesque luctus lacinia rhoncus. Morbi vel nisi ipsum. Phasellus non ultrices massa, non auctor est.<\/p>\n

Nulla convallis fringilla odio vel tristique. Phasellus suscipit nisl nec hendrerit iaculis. Quisque velit urna, pellentesque et tristique sed, malesuada ut lectus. Etiam quam urna, porta ac velit vel, condimentum sagittis libero. Cras aliquam mauris at erat commodo lacinia. Aliquam ornare felis dui. Praesent mattis purus eros, nec rhoncus nisi mattis sed.<\/p>\n

Sed non dui sit amet eros blandit lobortis nec nec neque. Aliquam consequat ullamcorper odio, at mattis libero ultricies non. In elementum commodo ultrices. Phasellus tempus sapien semper neque vehicula, vel consectetur enim facilisis. Fusce in lectus eu nisi pretium molestie. Ut nec turpis luctus, semper enim et, porta lacus. Donec in nisl nisl. In nulla ex, eleifend finibus erat ut, tristique maximus nibh. Cras a pellentesque lacus, et auctor lorem. Duis id commodo felis. In lacinia rhoncus metus, et elementum lorem feugiat vehicula. Donec pellentesque ex et ex rutrum, vestibulum dictum metus imperdiet. Curabitur dignissim molestie tincidunt. Fusce pharetra enim id nibh eleifend molestie. Nulla vehicula est in fringilla varius.[\/vc_column_text][\/vc_column][\/vc_row][\/vc_section][vc_section disable_element=”yes” el_name=”Projektf\u00f6rfarande”][vc_row][vc_column width=”1\/2″]

Environmental management<\/p>

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Planting of eelgrass beds<\/h2>

During the project period, as many as 20,000 eelgrass seedlings will be planted …<\/p>\n<\/div> <\/header>\n

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This is how many of the project's eelgrass seedlings have been planted<\/span>5 %<\/strong><\/div>\n
<\/span><\/div>\n <\/div>\n
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Here's how...<\/span>89 %<\/strong><\/div>\n
<\/span><\/div>\n <\/div>\n [\/vc_column][vc_column width=”1\/2″]
\"\u00c5lgr\u00e4splantor
Eelgrass beds are important underwater habitats for fish and other animals. \nPhoto: Henrik M\u00f6ller<\/figcaption><\/figure>[\/vc_column][\/vc_row][\/vc_section][vc_section disable_element=”yes” background_position=”center bottom” css=”.vc_custom_1737553245215{background-image: url(https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2021\/06\/tree-bg.jpg?id=853) !important;background-position: center !important;background-repeat: no-repeat !important;background-size: cover !important;}” el_name=”F\u00f6re och efter”][vc_row][vc_column width=”1\/2″]
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\"\"<\/div>\n Algsoppa<\/span>\n Levande kust<\/span>\n \u2039 \u203a<\/span><\/span>\n \n <\/div>\n [\/vc_column][vc_column width=”1\/12″][\/vc_column][vc_column width=”5\/12″]

Before and after<\/p>

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A living coast or dead seaweed soup<\/h2>

Eelgrass beds are very important, among other things. Drag the slider to see the difference between ….<\/p>\n<\/div> <\/header>\n [\/vc_column][\/vc_row][\/vc_section][vc_section disable_element=”yes” el_name=”Projektnyheter”][vc_row][vc_column]

A nature reserve in the Kattegat<\/p>

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Latest news from Halland weather island<\/h2>

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam dolor sapien, sollicitudin sed magna at, posuere posuere arcu. Sed eu nibh blandit, tincidunt justo sit amet, interdum quam<\/p>\n<\/div> <\/header>\n [\/vc_column][vc_column]

\n <\/a>\n
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\n River \u00c4tran<\/span>

The sea lamprey is fighting for its survival in the River \u00c4tran\u2014watch the video clip<\/h3>\n

It has existed on Earth for more than 400 million years. But today, the sea lamprey is one of Sweden\u2019s most endangered\u2026<\/p>\n <\/div>\n <\/article>\n

\n <\/a>\n
\n \"\" <\/div>\n
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\n River \u00c4tran<\/span>

Video from the Stockholm River \u2013 New Hope for Salmon and Sea Lampreys<\/h3>\n

When the waterway was opened at Okome Mill in Stock\u00e5n, fish were able to move freely upstream through the water system. Spawning\u2026<\/p>\n <\/div>\n <\/article>\n

\n <\/a>\n
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\n River R\u00e5\u00e5n<\/span>

New fish counter displays results instantly\u2014eight species of fish have already passed through the River R\u00e5\u00e5n<\/h3>\n

After the City of Helsingborg removed the G\u00f6rarpsdammen dam on the River R\u00e5\u00e5n in 2025, a new fish counter was installed upstream\u2026<\/p>\n <\/div>\n <\/article>\n <\/div>

Read more news \u2192<\/span><\/a><\/p>[\/vc_column][\/vc_row][\/vc_section]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

[vc_section background_position=”center center” css=”.vc_custom_1737552888011{background-image: url(https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2025\/01\/backdrop_projekt.jpg?id=1219) !important;background-position: center !important;background-repeat: no-repeat !important;background-size: cover !important;}” el_name=”Sidhuvud”][vc_row][vc_column][\/vc_column][\/vc_row][\/vc_section][vc_section][vc_row][vc_column][vc_column_text] Sea lamprey, freshwater pearl mussel and thick-shelled river mussel are all endangered species in Sweden. Through the Improve Aquatic LIFE project, concrete actions are now being taken to improve their chances of survival – from restoring habitats and re-establishing reproductive cycles to […]<\/p>\n","protected":false},"author":7,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-2886","page","type-page","status-publish","hentry"],"yoast_head":"\nImproving the conservation status of target species - Improve Aquatic Life<\/title>\n<meta name=\"description\" content=\"Sea lamprey, freshwater pearl mussel and thick-shelled river mussel are all endangered species in Sweden.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/improveaquaticlife.se\/en\/improving-the-conservation-status-of-target-species\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Improving the conservation status of target species\" \/>\n<meta property=\"og:description\" content=\"Sea lamprey, freshwater pearl mussel and thick-shelled river mussel are all endangered species in Sweden.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/improveaquaticlife.se\/en\/improving-the-conservation-status-of-target-species\/\" \/>\n<meta property=\"og:site_name\" content=\"Improve Aquatic Life\" \/>\n<meta property=\"article:modified_time\" content=\"2025-06-25T12:23:00+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2025\/06\/Havsnejonoga-Hogvadsan-ar-2000.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1958\" \/>\n\t<meta property=\"og:image:height\" content=\"1224\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"8 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/improveaquaticlife.se\\\/en\\\/improving-the-conservation-status-of-target-species\\\/\",\"url\":\"https:\\\/\\\/improveaquaticlife.se\\\/en\\\/improving-the-conservation-status-of-target-species\\\/\",\"name\":\"Improving the conservation status of target species - 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