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In page Kipper:

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Kipper time is the season in which fishing for salmon in the River Thames in the United Kingdom is forbidden by an Act of Parliament; this period was originally the period 3 May to 6 January but has changed since.[1] Kipper season refers (particularly among fairground workers, market workers, taxi drivers and the like) to any lean period in trade, particularly the first three or four months of the year.[citation needed]