IMIS

Assuming an emigration date of June 18th in both 2008 and 2009, marine migration duration was 46 to 78 days. Mean durations were 59±6 in 2008, 65±7 in 2009 and 63±7 days combined. Tracking revealed migrant movements into the intertidal zone with the flood and ebb of the tide. Most detections were in surface waters (0 to 3 m). Inter/sub-tidal movements and consecutive repetitive dives (maximum 52.8 m) resulted in extreme body temperature shifts (-0.2 to18.1oC). Approximately half of intertidal and subtidal detections were between 9 to13oC, and 1 to 3oC, respectively. Stomach contents and deep diving suggested feeding in both inter/sub-tidal zones. We suggest that char tolerate cold water at depth to capture prey in the subtidal zone, then seek warmer water to enhance feeding/digestion physiology.