Movement of tiger muskellunge in Mayfield Reservoir,Washington

Sixteen 67–100-cm tiger muskellunge (hybrids of northern pike Esox lucius and muskellunge E. masquinongy) were implanted with ultrasonic tags and tracked in Mayfield Reservoir for 7–34 months to determine seasonal movements. Year-to-year site fidelity was observed, and the area occupied in summer and fall was about one-third of that occupied in winter and spring. The distance traveled by fish in summer–fall was about half of that in winter–spring. Tiger muskellunge were located in aquatic macrophytes in 2–3 m of water in summer–fall and offshore in 5–10 m of water in winter–spring. These results are consistent with research on both parent species and suggest that interactions with salmonids may be minimal.