<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><p>In 2000 and 2001, larval vendace, <italic>Coregonus albula</italic> (L.), were marked and released into Lake Wigry. The larvae were immersed in alizarin red S. Of the 19.2 million vendace larvae released in 2000, 2 million were marked (10.4% of the overall number of fish released), and in 2001 of the 18.8 million fish released, 7 million were marked (47.8%). In subsequent years, otoliths were excised from caught vendace and the number of them with alizarin marks was determined. It was assumed that all unmarked specimens came equally from natural spawning and stocking assuming that survival is equal in both forms of recruitment. It was confirmed that 82.4% of the vendace caught from the 2000 generation originated from stocking, while this figure was 64.2% of all specimens caught from the 2001 generation. Lake Wigry hosts the most abundant vendace population in Poland, and this stock spawns on a massive scale annually. Even so, the study described herein provides evidence of just how important systematic stocking is to the maintenance of the vendace population in this lake.</p></abstract>

In 2000 and 2001, larval vendace, Coregonus albula (L.), were marked and released into Lake Wigry. The larvae were immersed in alizarin red S. Of the 19.2 million vendace larvae released in 2000, 2 million were marked (10.4% of the overall number of fish released), and in 2001 of the 18.8 million fish released, 7 million were marked (47.8%). In subsequent years, otoliths were excised from caught vendace and the number of them with alizarin marks was determined. It was assumed that all unmarked specimens came equally from natural spawning and stocking assuming that survival is equal in both forms of recruitment. It was confirmed that 82.4% of the vendace caught from the 2000 generation originated from stocking, while this figure was 64.2% of all specimens caught from the 2001 generation. Lake Wigry hosts the most abundant vendace population in Poland, and this stock spawns on a massive scale annually. Even so, the study described herein provides evidence of just how important systematic stocking is to the maintenance of the vendace population in this lake.

Marking and return method for evaluating the effects of stocking larval vendace, <italic>Coregonus albula</italic> (L.), into Lake Wigry in 2000-2001

Department of Fish Biology and Pisciculture, Faculty of Environmental Sciences and Fisheries, University of Warmia and Mazury, Oczapowskiego 5, 10-719 Olsztyn, Poland

Fisheries & Aquatic Life

Marking and return method for evaluating the effects of stocking larval vendace,  (L.), into Lake Wigry in 2000-2001

In 2000 and 2001, larval vendace, Coregonus albula (L.), were marked and released into Lake Wigry. The larvae were immersed in alizarin red S. Of the 19.2...

Marking and return method for evaluating the effects of stocking larval vendace, Coregonus albula (L.), into Lake Wigry in 2000-2001

Publié en ligne: 27 janv. 2012

Pages: 259 - 265

DOI: https://doi.org/10.2478/v10086-011-0032-5

Mots clés
vendace, otoliths, alizarin red S, marking and return method, marking coefficient, stocking

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