{"id":1896,"date":"2025-01-22T14:57:29","date_gmt":"2025-01-22T14:57:29","guid":{"rendered":"https:\/\/improveaquaticlife.se\/thick-shelled-river-mussel\/"},"modified":"2025-06-26T11:58:17","modified_gmt":"2025-06-26T11:58:17","slug":"thick-shelled-river-mussel","status":"publish","type":"page","link":"https:\/\/improveaquaticlife.se\/en\/thick-shelled-river-mussel\/","title":{"rendered":"Thick-shelled river mussel"},"content":{"rendered":"

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Thick-shelled river mussel<\/h1>\n <\/div>\n <\/div>\n [\/vc_column][\/vc_row][\/vc_section][vc_section][vc_row][vc_column][vc_column_text]The thick-shelled mussel (Unio crassus<\/em>) is a freshwater mussel<\/strong> with a thick, elliptical shell that grows to a lenght of 4-7 centimeters. The species mainly lives in running waters with sand and gravel bottoms and is found only in a few areas in eastern Sweden, from Sk\u00e5ne to Dalarna.<\/p>\n

Thick-shelled mussel can live up to 90 years.<\/p><\/blockquote>\n

It feeds by filtering water and has <\/span>a complex life cycle that includes a parasitic stage in which the larvae, known as glochidia, attach to the gills of host fish where they develop into small mussels. Possible host fish in Sweden include minnows, bullhead and bleak. Once developed, the juvenile mussels then detach from the host fish and live for several years buried in sediment before becoming adults. The thick-shelled river mussel can live up to 90 years.<\/p>\n

Critically endangered species
\n<\/strong>Thick-shelled river mussel is highly threatened, both in Sweden and internationally, due to acidification, eutrophication and physical impacts on its habitat. Human impact such as river regulation, dredging and clearing have destroyed important benthic habitats, and agriculture contributes to deteriorating water quality. In addition, the survival of the species is affected by the decline of host fish populations, resulting a lack of recruitment of juvenile mussels which over timeja, faktiskt b\u00e5de Lukas, Karin och Juilis causes mussel populations to slowly die out.
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Host fish help
\n<\/strong>The species is protected by law in Sweden and listed under the EU’s Species and Habitats Directives, which requires the establishment of Special\u00a0 Conservation Areas, and actions to strengthen populations. One effective method is to catch host fish and place them in tanks with gravid mussels to increase the chance of larvae attaching to the fish gills. The fish are then released back into the river where the larvae can grow into small mussels that drop of and burrow themselves into the bottom. After a few years, they develop into adult mussels and can contribute to reproduction.[\/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>
4,500<\/span><\/div>\n
Number of eelgrass seedlings planted<\/div>\n <\/div>\n [\/vc_column][vc_column width=”1\/4″]
\n <\/i><\/span>
400<\/span><\/div>\n
Number of hours under the surface<\/div>\n <\/div>\n [\/vc_column][vc_column width=”1\/4″]
\n <\/i><\/span>
12<\/span><\/div>\n
Number of artificial reefs<\/div>\n <\/div>\n [\/vc_column][vc_column width=”1\/4″]
\n <\/i><\/span>
130<\/span><\/div>\n
Tons of stones thrown into the sea<\/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
\n \"\" <\/div>\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
\n
\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
\n \"\" <\/div>\n
\n
\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_1738316743497{background-image: url(https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2025\/01\/malarmussla_1924.png?id=1741) !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]The thick-shelled mussel (Unio crassus) is a freshwater mussel with a thick, elliptical shell that grows to a lenght of 4-7 centimeters. The species mainly lives in running waters with sand and gravel bottoms and is found only in a few areas in […]<\/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-1896","page","type-page","status-publish","hentry"],"yoast_head":"\nThick-shelled river mussel - Improve Aquatic Life<\/title>\n<meta name=\"description\" content=\"The thick-shelled mussel (Unio crassus) is a freshwater mussel. with a thick, elliptical shell that grows to a lenght of 4-7 centimeters.\" \/>\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\/thick-shelled-river-mussel\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Thick-shelled river mussel\" \/>\n<meta property=\"og:description\" content=\"The thick-shelled mussel (Unio crassus) is a freshwater mussel. with a thick, elliptical shell that grows to a lenght of 4-7 centimeters.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/improveaquaticlife.se\/en\/thick-shelled-river-mussel\/\" \/>\n<meta property=\"og:site_name\" content=\"Improve Aquatic Life\" \/>\n<meta property=\"article:modified_time\" content=\"2025-06-26T11:58:17+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2025\/01\/webbplatsbild_1200px.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"675\" \/>\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=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/improveaquaticlife.se\\\/en\\\/thick-shelled-river-mussel\\\/\",\"url\":\"https:\\\/\\\/improveaquaticlife.se\\\/en\\\/thick-shelled-river-mussel\\\/\",\"name\":\"Thick-shelled river mussel - 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