Schelly
Rare whitefish of the English Lake District
The schelly is a freshwater fish found only in four lakes in Cumbria, England. It belongs to the salmon family and faces threats from water management and birds. Conservationists classify it as vulnerable due to declining numbers in one key habitat.
- Endemic to four lakes in the English Lake District
- Listed as Vulnerable by the IUCN
- Cormorants are culled at Haweswater to protect fish
- Spawning success depends on winter water levels
- Taxonomy disputed as distinct species or whitefish variant
What it is
The schelly is a freshwater fish belonging to the salmon family. It is endemic to the Lake District in England, meaning it is found nowhere else in the world. This fish is a type of whitefish, closely related to other species in the genus Coregonus. It inhabits cold, clear lakes and is known for its silvery appearance typical of whitefish. It is a distinct population group that some scientists treat as a separate species while others view it as a variant of the common Eurasian whitefish.
Where it lives
This fish lives exclusively in four lakes within Cumbria: Brothers Water, Haweswater, Red Tarn, and Ullswater. These bodies of water cover a total area of approximately 20 square kilometres. The schelly is restricted to these specific locations and does not migrate to other regions. While the populations in Brothers Water, Red Tarn, and Ullswater appear stable, the group in Haweswater has shown signs of decline. The habitat consists of deep, cold freshwater environments typical of the Lake District geography.
How it lives
The schelly is a freshwater resident that does not migrate to the sea. Its life cycle is closely tied to the water levels of its host lakes. During the winter months, specifically from January to March, the fish spawns. The strength of each year class, or the number of young surviving to join the population, depends on lake levels during this spawning and incubation period. Growth rates later in the year are influenced by water levels between June and October. Cormorants, which are fish-eating birds, prey on the schelly, posing a natural threat to the population.
Breeding and life cycle
Spawning occurs during the early part of the year, from January through March. The success of reproduction is highly sensitive to environmental conditions, particularly the depth of the water. Low water levels during this critical window can reduce the survival rate of eggs and young fish. After hatching, the growth of the juvenile fish is affected by lake levels during the summer months. This dependency on water volume makes the species vulnerable to changes in lake management and abstraction practices.
Fish and people
Fishery officers at Haweswater have implemented a culling programme for cormorants to protect the declining schelly population. This action highlights the conflict between native fish conservation and bird populations. The schelly is not widely known for commercial fishing or aquarium trade but is significant for local biodiversity. Its presence is a marker of the ecological health of the Lake District lakes. Management strategies focus on maintaining water levels and controlling predation to ensure the survival of this endemic fish.
Status and threats
The International Union for Conservation of Nature lists the schelly as Vulnerable. The primary threats include water abstraction, which lowers lake levels, and predation by cormorants. Data from a thirty-year period shows that reduced water levels correlate with population declines in Haweswater. While three of the four populations remain stable, the decline in Haweswater has prompted active management interventions. Conservation efforts aim to balance water usage with the needs of the fish during its breeding season.
Questions people ask about Schelly
Where does the schelly live?
The schelly is found only in four lakes in the Lake District of England: Brothers Water, Haweswater, Red Tarn, and Ullswater. It is endemic to this small region and does not exist naturally anywhere else in the world.
Why is the schelly population declining?
The main threats are water abstraction, which lowers lake levels, and predation by cormorants. Low water levels during the January to March spawning period reduce the survival rate of eggs and young fish, particularly in Haweswater.
Is the schelly a distinct species?
Its status is disputed. Some authorities list it as a separate species, Coregonus stigmaticus, while others consider it a variant of the widespread Eurasian whitefish, Coregonus lavaretus, due to similar physical traits.
Good reading and sources
The facts on this page come from the Wikipedia article "Schelly", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). EveryFish rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.
It may contain mistakes, and figures change over time. Nothing here is investment or buying advice. If something is wrong, tell us. Last refreshed 2026-11-15.
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