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In 1998, a forest fire burned 58% of the forested shoreline surrounding Tibbitt Lake, Northwest Territories, including riparian vegetation used by Northern Pike ( Esox lucius ) as spawning habitat. This presented an opportunity to investigate the effects that habitat disturbance from a natural forest fire had on young-of-the-year (Y-O-Y) Northern Pike. Pike fry were collected from three burned and three unburned sites around Tibbitt Lake in 1999 (the first post-fire spawning season) and again in 2001. Differences in size and relative abundance were evaluated between sites. Y-O-Y Northern Pike were significantly larger at the unburned sites ( P <0.01) and the relative abundance of Y-O-Y Northern Pike increased significantly at burned sites (alpha=0.1; P <0.07) following re-vegetation two years post fire. These differences may be due to fire-induced changes in physical habitat or food availability. Forest fires decrease the density of riparian vegetation, which likely provides better spawning and rearing habitat for Northern Pike in the long-term. En 1998, un feu de foret a brule 58% de la rive boisee entourant le lac Tibbitt, situe dans les Territoires du Nord-Ouest, y compris la vegetation riveraine utilise par le grand brochet ( Esox lucius ) comme habitat de fraie. Cet evenement a presente une occasion pour etudier les effets causes par un feu de foret sur l'habitat de jeunes de l'annee du grand brochet. Les jeunes brochets ont ete recueillis sur trois sites brulees et trois sites non brules autour du lac Tibbitt en 1999 (la premiere annee de fraie apres le feu de foret) et a nouveau en 2001. La difference de grandeur et l'abondance relative des poissons ont ete analyses entre les differents sites. Les jeunes grands brochets aux sites non-atteints par le feu etaient considerablement plus grands ( P < 0,01) que ceux aux sites brules. Les sites brules, subissant une rapide revegetation dans les deux annees apres le feu, ont augmente en abondance relative de jeunes grands brochets (alpha = 0,1, P < 0,07). Ces differences peuvent etre dues aux changements induits par le feu sur l'aspect physique de l'habitat ou sur la disponibilite de nourriture. Les incendies de foret reduisent la densite de la vegetation riveraine, qui fournit probablement de meilleure habitat de fraie et d'alevinage pour le grand brochet a long terme.

Effects of Forest Fire on Young-of-the-year Northern Pike, <em>Esox lucius</em>, in the Northwest Territories