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Filters: Tags: Journal of Freshwater Ecology (X) > Categories: Publication (X) > partyWithName: Harold M Tyus (X)

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Habitat use and movements of young Colorado squawfish Ptychocheilus lucius were determined by seining 1,194 of the fish in shoreline areas. A total of 922 of these was fin-clipped in selected habitats and 230 (25%) were subsequently recaptured. Most young Colorado squawfish were captured in shallow shoreline embayments (backwaters; 85% of captures), where they were most abundant in spring (April; 68%). Some individuals used more than one habitat and moved between backwaters, shoreline eddies, and main-channel runs. A diel pattern of backwater use was associated with warmer water temperatures, especially in spring (April) when backwater temperatures exceeded river temperatures. Published in Journal of Freshwater...
We studied the effects of three flow regimes on the activity patterns and movements of one-, three-, six-, and 36-week old Colorado pikeminnows (Ptychocheilus lucius) and two-week old razorback suckers (Xyrauchen texanus) in an experimental tank under light and dark conditions. The seven-chambered tank simulated a system of backwater habitats, which are used by the young fishes in nature. Water flows through the tank were slow, and velocities were discernable only in the vicinity of surface ports that connected each chamber. Fish movements were related to light or dark condition and activity tended to increase with age. Larvae, relatively active in daylight, moved little at night with no flow, but flow stimulated...