W. Thompson, 1835
The pollan or Irish pollan (Coregonus pollan or Coregonus autumnalis) is a freshwater whitefish known only from five Irish lakes, Lough Neagh, Lower Lough Erne, Lough Ree, Lough Derg, and Lough Allen.
The pollan populations are threatened by ecosystem changes such as eutrophication and increases in introduced species, including pike, roach, and zebra mussel. Only the population of Lough Neagh in Northern Ireland remains abundant and supports a small fish commercial fishery. The other UK population in Lough Erne has severely declined. The Lough Allen population was only confirmed for the first time in 2006. Other populations rely on stocking for their survival.
In scientific literature and national biodiversity and conservation assessments, the Irish pollan are usually classified within the species Coregonus autumnalis. That is a widespread anadromous whitefish which inhabits coastal waters and rivers of Arctic Siberia, Alaska, and Canada and is there known as the Arctic cisco or Siberian omul. C. autumnalis is not distributed elsewhere in northwestern Europe, and the pollan are often given a status of subspecies as Coregonus autumnalis pollan. These classifications are based on the close genetic similarity of the Arctic and Irish whitefish populations. By IUCN, the Irish pollan is, however, listed as a distinct fish species Coregonus pollan, whereas FishBase refers to it alternatively as a species or as part of the Arctic C. autumnalis.
Unlike its Arctic relatives, the Irish pollan does not migrate to the sea.
- Froese, Rainer and Pauly, Daniel, eds. (2010). "Coregonus pollan" in FishBase. April 2010 version.
-  IFI Inland Fisheries Ireland (accessed 1 June 2015)
- Ferguson, A: North Ireland Priority Species: Coregonus autumnalis pollan – Pollan habitats.org.uk (read April 2010)
- Harrison, A.J., Kelly, F.L., Rosell, R.S., Champ, T.W.S., Connor, L. and Girvan, J.R. (2010) First record and initial hydroacoustic stock assessment of pollan Coregonus autumnalis Pallas in Lough Allen, Ireland. Biology and Environment: Proceedings of the Royal Irish Academy 110B, 69-74.
- Freyhof, J. & Kottelat, M. (2008) Coregonus pollan IUCN Red List of Threatened Species. Version 2010.1. Downloaded 25 April 2010.
- All-Ireland Species Action Plan: Pollan (Coregonus autumnalis) North Ireland Environmental Agency 2006
- National action plan - Coregonus autumnalis (Pollan) UK Biodiversity Action Reporting System. (read April 2010)
- Andrew J. Harrison, Lynda Connor, Emma Morrissey and Fiona Kelly (2012) Current status of pollan Coregonus autumnalis pollan in Lough Ree, Ireland. Biology and Environment: Proc. Royal Irish Academy 112B, 1-9 DOI: 10.3318/BIOE.2012.09
- Ferguson, A., Himberg, K.-J.M., & Svärdson, G. (1978). Systematics of the Irish pollan (Coregonus pollan Thompson): an electrophoretic comparison with other Holarctic Coregoninae. Journal of Fish Biology 12, 221-233.
- Bodaly, R.A., Vuorinen, D.A., Ward, R.D., Luczynski, M., & Reist, J.D. (1991). Genetic comparisons of the New and Old World coregonid fishes. Journal of Fish Biology 38, 37-51.
- Politov, D.V., Gordon, N.Y., & Makhrov, A.A. (2002). Genetic identification and taxonomic relationships of six Siberian species of Coregonus. Archiv für Hydrobiologie: Special Issues Advances in Limnology 57, 21-34.
- Froese, Rainer and Pauly, Daniel, eds. (2010). "Coregonus autumnalis" in FishBase. April 2010 version.
- "Pollan". Collier's New Encyclopedia. 1921.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>