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En 1995, la presence du Grand brochet ( Esox lucius ), une espece piscivore, a ete notee pour la premiere fois dans le lac Ramsay, Parc de la Gatineau (Quebec). Il a ete determine que l’espece a ete introduite apres l’ete 1991. Un echantillonnage exhaustif de l’ichtyofaune du lac en 2001 et 2002 a permis de constater que trois des 17 petites especes de poissons du lac sont probablement disparues: le Mulet perle ( Margariscus margarita ), l’Epinoche a cinq epines ( Culaea inconstans ) et une forme rare de l’Epinoche a trois epines ( Gasterosteus aculeatus ). Il est predit que plusieurs autres especes pourraient disparaitre au cours des prochaines annees. La croissance du Grand brochet dans le lac Ramsay est comparable aux autres lacs du sud du Quebec. En 2001, le rapport femelles:mâles etait de 15 : 1, une valeur anormale et inexpliquee. In 1995, the Northern Pike ( Esox lucius ), a piscivorous fish, was captured for the first time in Ramsay Lake, a small lake of the Gatineau Park (Quebec). It was determined that this species was introduced after the summer of 1991. An exhaustive survey of the ichthyofauna of this lake in 2001 and 2002 indicated that three of the 17 small-bodied species of the lake have probably disappeared: the Pearl Dace ( Margariscus margarita ), the Fivespine Stickleback ( Culaea inconstans ) and a special form of the Threespine Stickleback ( Gasterosteus aculeatus ). It is predicted that several other species may be extirpated in the next few years. Northern Pike growth in the lake is comparable to other values obtained for other southern Quebec lakes. In 2001, the female:male ratio was highly unbalanced and difficult to explain at 15 : 1. Erratum added.

canadian field-naturalist

Charactéristiques d'une population introduit du Grand brochet, &lt;em&gt;Esox lucius&lt;/em&gt;, dans le lac Ramsay, Parc de la Gatineau, Québec, et impact sur l'ichtyofaune