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Estimation of vendace year-class strength with different methods in the subarctic lake Inari

Vendace (Coregonus albula) is a new introduced species in the Paatsjoki river system and lake Inari; it has only got a 30- to 40-year history in the area. The strong vendace year-classes of the 1980s were followed by weak ones until 2000, when a stronger year-class emerged. Data on the vendace catch...

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Published in:	Annales zoologici fennici 2004, Vol.41 (1), p.249-254
Main Author:	Salonen, Erno
Format:	Article
Language:	English
Subjects:	Age groups Animal age determination Coregonus albula Estimation methods Fish trawling Fisheries Fisheries management Fisheries science Freshwater Freshwater fishes Lakes Population dynamics and stock assessment Salmonidae Whitefish
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creator	Salonen, Erno
description	Vendace (Coregonus albula) is a new introduced species in the Paatsjoki river system and lake Inari; it has only got a 30- to 40-year history in the area. The strong vendace year-classes of the 1980s were followed by weak ones until 2000, when a stronger year-class emerged. Data on the vendace catch-at-age were collected from 1987 to 2001 and the year-class strengths (YCS) were estimated by the virtual population analysis (VPA). The YCS was estimated directly by survey trawling conducted annually in early fall aimed at 0+ fish and by seine netting in the following winter. Direct estimates were compared with VPA estimates. The trawl survey and winter seine data show that the YCS of vendace is discernible during the first year of their lifespan. As a practical application in fisheries management, these data can be used in adjusting of e.g. stocking of predatory salmonids.
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source	JSTOR Archival Journals and Primary Sources Collection
subjects	Age groups Animal age determination Coregonus albula Estimation methods Fish trawling Fisheries Fisheries management Fisheries science Freshwater Freshwater fishes Lakes Population dynamics and stock assessment Salmonidae Whitefish
title	Estimation of vendace year-class strength with different methods in the subarctic lake Inari
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