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1 January 2006 Summer Diel Activity and Movement Paths of Flathead Catfish (Pylodictis olivaris) in Two Missouri Streams
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Within an ongoing round-the-clock radiotracking project, a subset of adult flathead catfish Pylodictis olivaris (n = 6) was continuously radio-tracked for 24 h to determine detailed diel movement path characteristics and activity in two Missouri streams. The ongoing radiotracking revealed that only a small percentage of point-in-time relocations were recorded as moving, while the majority (greater than 90% for every hour of the day) found fish stationary. The continuously-tracked subset of catfish generally moved by making discrete directed movements from one location to another, with locations corresponding to a physical habitat feature (large woody debris, clay point, undercut bank). All fish revisited locations during the 24-h tracking efforts. Movements were less than 100 m during early afternoon and the first 2 h after sunset, with longer movements undertaken from 2100 through the night to the 0500 hour, ceasing at sunrise. Movement paths had a median distance of 641.16 m with a median activity radius of 66.55 m. Fish spent a median 23.33 h stationary and 0.67 h moving during the diel cycle. The continuous tracking effort resulted in finer resolution and detail than was evident in the larger, typical point-in-time tracking dataset which did not highlight an early afternoon activity period, perhaps due to short, quick movements made at that time.

JASON C. VOKOUN and CHARLES F. RABENI "Summer Diel Activity and Movement Paths of Flathead Catfish (Pylodictis olivaris) in Two Missouri Streams," The American Midland Naturalist 155(1), 113-122, (1 January 2006).[0113:SDAAMP]2.0.CO;2
Accepted: 1 June 2005; Published: 1 January 2006

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