Share this image — Hide sharing options. The Arctic charr Salvelinus alpinus is a large, cold-water fish whose physical appearance is highly variable between and within populations 3. Its body colour is largely dependent on the location, season and sexual maturity of the individual 2but is generally silver-white, sometimes becoming bright orange on the underside and fins, especially during the spawning season 4. This vivid orange colouration is mostly seen in the male Arctic charr, although it may also be evident in the doeni 2 4. The intensity of the orange-red colour is thought to be related to the nutrition, health and foraging ability of the individual 5deriving from pigments gained from the diet 6. The pectoral and anal fins of breeding Arctic charr are red 2with a narrow white margin on the forward-facing edges 2 4 7. The caudal fin is slightly forked and has a yellow-gold border 4 7. The fins of the juvenile are paler northern in the adult 2. Non-breeding Arctic charr do not usually exhibit the bright colouration and are much paler in comparison 4with a bronze-green upperside, pale sides and a pale belly 2 7. The sides and back of the body of breeding and non-breeding individuals are patterned with multiple spots ranging in colour ireland white to red 2 4 7. The largest spots are usually along the lateral linewhich runs down each side of the body 2. In addition to its varied colouration, the Arctic charr is also highly variable in size and shape 3. However, most individuals have a slightly rounded, elongated body with a large mouth and an upwardly biodiversity lower jaw 4 8. Some scientists recognise a number of subspecies of Arctic charr 3. Migratory behaviour in the Arctic charr is highly variable 1. Certain populations make annual migrations from the sea to a freshwater lake or river. Other populations are sedentary and remain within their freshwater habitat throughout their lives 1 2. Riverine populations have been known to perform migrations within the river system or may also be sedentary 1. Migratory Arctic charr usually reach sexual maturity and spawn for the first time at four to ten years old, whereas lake-dwelling individuals spawn after two to five years 1. After this period, the Arctic charr only spawns doeni two to four years, once the reproductive organs have redeveloped from the last season 3. Most individuals will only spawn around three times throughout their life 3. Spawning usually takes place onto a rocky or gravelly substrate 1 2 9. The male Arctic charr sometimes build a nest, which can be up to two or three metres in diameter, where it spawns with several females 1. Males can be very territorial during the spawning season 1. In lake-dwelling populations, spawning occurs between autumn and early winter 1with young fish usually emerging the following spring 9. However, different stocks are known to spawn at different times throughout the year 1. Once hatched, the young fish will remain hidden within the gravel and stones, only leaving to feed on insect larvae and small crustaceans 9. The diet of the Arctic charr is mainly composed of small fish, amphipodsplanktonic crustaceansmolluscs and insects 2. When feeding at sea, fish and larger invertebrates are taken 1 3. The Arctic charr is able to withstand freezing conditions and can gain weight in this environment, where other species would lose weight 3 7. This species is known to form dense shoals in deep water 6. The Arctic charr has a circumpolar distribution 7stretching from Alaska to northern Russia, including Canada, Greenland, Norway and Iceland. There are isolated populations in the northern United Kingdom, Scandinavia and Finland, as well as landlocked populations in Canada and the United States 2. The Arctic charr inhabits freshwater lakes and rivers, as well as estuaries and oceans 2 8where there is cold, clear water 2. Populations in the ocean remain close to the coastline 1 2. In rivers, the Arctic charr is found in deep runs and pools 2. The Arctic charr is classified as Least Concern on the IUCN Red List 1. The Arctic habitat of the Arctic charr is under threat due to global warming, which is increasing the temperature of freshwater lakes, rivers and oceans. This species is the most temperature-sensitive species in the Salmonidae family, and temperature increases may compromise its future survival 8 10 The freshwater habitats of the Arctic charr are also susceptible to pollution, eutrophication and acidification, which have a negative effect on the fish which inhabit strategy areas Introduced species also pose a threat to the Arctic charr 3 11outcompeting it for living and spawning areas, as well as altering the abundance of prey species such as phytoplankton. The zebra mussel Dreissena polymorpha in Northern Ireland is just one example of how an invasive species can affect the Arctic charr, having colonised the hard surfaces in the Shannon-Erne waterway, biodiversity having a negative effect on areas used by the Arctic charr as spawning grounds The Arctic charr is northern highly prized sports fish, and is also caught and sold for food, meaning that its population could come under threat in the future due to overfishing 2 3 9. The infrequency of spawning in the Arctic charr may also make it more susceptible to overfishing 3. In Northern Ireland, certain areas the Arctic charr inhabits have been designated as Areas of Special Scientific Interest and Special Areas of Interest, which offer protection to the habitat of this species. In Northern Ireland, there is also an action plan which aims to maintain or restore certain lakes which the Arctic charr is known to live in More research is necessary to manage the conservation of the Arctic charr Imposing fishing restrictions may also be an appropriate method for the conservation of this species 3. This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact: Ardea wildlife pets environment 59 Tranquil Vale London SE3 0BS United Kingdom Tel: Embed this Arkive thumbnail link "portlet" by copying and pasting the code below. Terms of Use - Doeni displayed portlet may be used as a link from your website to Arkive's online content for private, scientific, conservation or educational purposes only. It may NOT be used within Apps. MyARKive offers the scrapbook feature to signed-up members, allowing you to organize your favourite Arkive images and videos and share them with friends. Team WILD, an elite squadron of science superheroes, needs your help! Which species are on the road to recovery? This species is featured in the Arctic eco-region. Help us share the wonders of the natural world. Please help us raise ocean awareness in Bristol! BristolcharityconservationecosystemsEvents biodiversity, fundraisingGet involvedhelp usoceanocean conservationoceansUK. Underhogs by Durrell's Daniel Craven. Critically Endangereddocumentarydurrellendangered speciesfilmguest blogGuest blogshogsIndiapigpigspygmypygmy hogwild pigswildlife filmmaking. Wildscreen Arkive is a Wildscreen initiative. Share on Facebook Tweet Send email. Arctic charr Salvelinus alpinus. Share this image — Hide sharing options Share on Facebook Tweet Send email. Arctic charr fact file Description Biology Range Habitat Status Threats Conservation Find out more Glossary References Print factsheet Arctic charr description Kingdom Animalia Phylum Chordata Class ActinopterygiI Order Salmoniformes Family Salmonidae Genus Salvelinus 1 The Arctic charr Salvelinus alpinus is a large, cold-water fish whose physical appearance is highly variable between and within populations 3. Also known as Arctic char, Charr. Bull trout Salvelinus confluentus. Adriatic salmon Salmo obtusirostris. Arctic charr biology Migratory behaviour in the Arctic charr is highly variable 1. Arctic charr range The Arctic charr has a circumpolar distribution 7stretching from Alaska to northern Russia, including Canada, Greenland, Norway and Iceland. Atlantic mackerel Scomber scombrus. Holly-leaved naiad Najas marina. Arctic charr habitat The Arctic charr inhabits freshwater lakes and rivers, as well as estuaries and oceans 2 8where there is cold, clear water ireland. Sockeye salmon Oncorhynchus nerka. Christmas Island red crab Gecarcoidea natalis. American eel Anguilla rostrata. Arctic charr status The Arctic charr is classified as Least Concern on the IUCN Red List 1. Arctic charr threats The Arctic habitat of the Arctic charr is under threat due to global warming, which is increasing the temperature of freshwater lakes, rivers and oceans. Arctic charr conservation In Northern Ireland, certain areas the Arctic charr inhabits have been designated as Areas of Special Scientific Interest and Special Areas of Interest, which offer protection to the habitat of this species. Find out more Find out more about the Arctic charr and salmonid conservation: FishBase - Arctic charr: Authentication This information is awaiting authentication by a species expert, and will ireland updated as soon as possible. Glossary Amphipods A group of small shrimp-like crustaceans that includes sandhoppers, beach hoppers, and water lice. Anal fin In fish, an unpaired fin on the under surface of the fish, behind the anus. Caudal fin The tail fin of a fish. Crustaceans Diverse group of animals with jointed limbs and a hard external skeleton, characterised by the possession of two pairs of antennae, one pair of mandibles mouthparts used for handling and processing food and two pairs of maxillae appendages used in eating, which are located behind the mandibles. Includes crabs, lobsters, shrimps, woodlice and barnacles. Eutrophication A process in which a water body is enriched with excessive nutrients such as nitrogen and phosphorus resulting in the excessive growth of aquatic plants and the depletion of oxygen, creating unfavourable conditions for other organisms, such as fish. Invertebrates Animals with no backbone, such as insects, crustaceans, worms, molluscs, spiders, cnidarians jellyfish, corals, sea anemones and echinoderms. Larvae are typically very different in appearance to adults; they are able strategy feed and move around but are usually unable to reproduce. Lateral line A row of receptors that can detect movement via vibrations in water. The receptors are typically embedded in the skin, and in fish they form a line along the sides of the body. Molluscs A diverse group of invertebrates, mainly marine, that have one or all of the following: Includes snails, slugs, shellfish, octopuses and squid. Pectoral fins In fish, the pair of fins that are found on either side of the body just behind the gills. They are generally used for balancing and braking. Phytoplankton Aquatic plants, usually tiny, that drift passively with water movements. Planktonic Of or relating to plankton; aquatic organisms, usually tiny, that drift passively with water movements. Includes phytoplankton plantszooplankton animalsor other organisms such as bacteria. Spawning The production or depositing of eggs in water. Subspecies A population usually restricted to a geographical area that differs from other populations of the same species, but not to the extent of being classified as a separate species. Territorial Describes an animal, a pair of animals or a group that occupies and defends an area. References IUCN Red List February, http: The Free Press, New York. Department of Inland Fisheries and Wildlife Division of Fisheries and Hatcheries, Maine. Springer Verlag, Berlin, Germany. MSc thesis, University of North Carolina, USA. Journal of Fish Biology Department of the Environment Northern Ireland Northern Ireland Biodiversity Strategy. Environment and Heritage Service, Belfast. Ecology of Freshwater Fish X Close Image credit. X Close Link to this photo Embed this Arkive thumbnail link "portlet" by copying and pasting the code below. Read more about Other ways to link to Arkive Arkive Terms of Use. X Close MyARKive Add to scrapbook. Play the Team WILD game: This species is featured in: Please donate to Arkive Help us share the wonders of the natural world. Sign up to our strategy Get the latest wild news direct to your inbox. Blog Monday 05 June Please help us raise ocean awareness in Bristol! BristolcharityconservationecosystemsEventsfundraisingGet involvedhelp usoceanocean conservationoceansUK Saturday 20 May 14 ways northern help save the world animal welfarebiodiversitycarbonclimate changecommunityconservationenvironmentGet involvedglobal warminghuman impacts on the environmentocean acidificationocean conservationplastic wasterecyclingRenewable energysustainabilitywastewildlife Thursday 18 May Guest blog: Underhogs by Durrell's Daniel Craven Critically Endangereddocumentarydurrellendangered speciesfilmguest blogGuest blogshogsIndiapigpigspygmypygmy hogwild pigswildlife filmmaking. Contact us FAQs Links Terms and conditions Cookie policy. By using our site you agree to our use of cookies.
Andras Zlinszky, 2015. Wetland Symposium
Andras Zlinszky, 2015. Wetland Symposium
2 thoughts on “Northern ireland biodiversity strategy doeni”
As long as there are underutilized resources in the economy, deficit financing of compulsory work for the state is sustainable.
In fact, Heathcliff and Catherine purposely hurt each another through reckless and cruel actions.