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The swan mussel has a thin fragile shell. It is found in fresh stationary waters. It has a foot so that it maneuver a bit. There is one known incident of a swan. Descriptions and articles about the Swan Mussel, scientifically known as Anodonta cygnea in the Encyclopedia of Life. Includes Overview; Brief Summary; Distr. Anodonta-cygnea_jpg. Anodonta cygnea. Provided by Welter Schultes, Francisco Locality: Germany: Schleswig-Holstein, Brammer Teich near Kiel.

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Breeding depends upon the presence of reasonable water quality and of fish. Show history of this page.

Anodonta cygnea swan mussel :: Northern Ireland’s Priority Species ::

Support environmental schemes aimed at reducing diffuse pollution whether from agricultural sources, from inadequate sewage treatment in towns or from the malfunctioning or failure of septic tanks in rural areas.

Swan mussel Conservation status. However, this increases where recent breeding and recruitment has been poor.

Zebra mussels are unable to colonise streams where water flow is significant and it is thought that these streams may act as reservoirs of native mussels which will assist in re-colonisation. The parasitic larvae are called glochidia and are produced in spring and carried by anoddonta current until they contact a bottom-living fish. Index Animalium Sherborn, species and genera until Prefers muddy substrate bare of vegetation.

Swan mussel – Wikipedia

They have a strong pungent odor and are used by carp fisherman as bait. Swan mussel shells appear to be of cyygnea thickness throughout, whereas duck mussel shells are clearly uneven and much thicker and opaque towards the lower front end of the shell. Retrieved from ” https: In Switzerland in up to m altitude.

Institute of Zoology, Slovak Academy of Sciences. The story may not end there, however, as the cynea mussel infestation is now waning and there is hope that the swan mussel can regain some of the territory lost to its competitor.

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Artificial lakes are usually reached when infected fishes are brought in, young mussels are rarely dispersed by water birds. Embryonal shell finely striated along the growth lines, the lines reach the margin. This is smaller though still a large shell at mm long but usually with a more distinctly angular shape.

An annotated list of the land and freshwater Mollusca of Northern Ireland. It can reach mm 6 in in size and has a nearly straight dorsal upper or hinge margin with a drawn out posterior end and slightly rounded to nearly straight ventral lower margin.

Its native distribution is European-Siberian. Views Read Edit View history. The shell color is often pale greenish or brownish. How to see this species Swan mussels can sometimes be seen from fishing stands at the margins of lakes with silty or mud bottoms. Unionidae The swan mussel is a very large bivalve mollusc which lives in streams, rivers and along lakeshores where the bottom is of rich mud or silt and relatively free of plant growth.

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Acknowledgements Contact us Cookie Policy Habitas. Host fishes for glochidia are Salmo trutta, Perca fluviatilis, Leuciscus leuciscus, Sander lucioperca and Gasterosteus aculeatus, but not Rhodus sericeus. This mussel is associated with relatively unpolluted slow streams and lakes with mud or silt bottoms, habitats which are in universal decline.

By using this site, you agree to the Terms of Use and Privacy Policy. Conservation of this species Current action Declaration as a Priority Species. Why is this species a priority in Northern Ireland? In brief A very large bivalve shell found in silty or muddy backwaters of streams, rivers and lakes Threatened both in Ireland and Europe by diffuse pollution and the resultant periodic de-oxygenation of waters A more acute or short-term threat has been delivered by the invasive zebra mussel which competes for dissolved oxygen and food Red listed in Ireland as Vulnerable VU and as a Priority Species in Northern Ireland Species description A very large bivalve shell with a flattened profile and broad, oblong shape.

List of all species. Glochidia are mature in autumn, are released in spring in England and in Italytheir size 0. The geographical anovonta of this species is from the British Isles east to Siberia, and andoonta into northern Africa. Click on map to open large map in new window. The swan mussel is a very large bivalve mollusc which lives in streams, rivers and along lakeshores where cygnfa bottom is of rich mud or silt and relatively free of plant growth. Putting a valve of the shell up to strong light separates these two species.

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Tolerates eutrophic conditions, but not in the last toxic stadium. In this way large beds of swan mussel along the Shannon and Erne River systems have perished and enormous numbers of empty shells cast ashore.

The swan musselAnodonta cygneais a large species of freshwater musselan aquatic bivalve mollusc in the family Unionidaethe river mussels. From Wikipedia, the free encyclopedia. Pictures of Anodonta cygnea. Home Introduction Selection Criteria:: The dorsal upper margin usually lies at an acute angle to the line of the ventral lower margin giving the shell a distinct wedge shape, instead of being almost parallel as in the swan mussel which produces a more oblong shape.

On a still, sunny day after a period of dry weather look down at the lake bottom with Polaroid glasses or using a glass-bottomed box. Anodonta cygnea Linnaeus They will then drop off after a period of weeks and find a suitable place on the bottom to begin an independent life. Down, BT18 0EU; cedar. Occasionally found in Spain and Portugal in artificially disturbed habitats, where infected fishes from central Europe were released.

The shell is thin and pale, whitish or pearly inside due to a thin layer of nacre, but protected by a periostracum outside which gives it a smooth, glossy brown, sometimes green appearance marked with strong concentric growth lines.