Spawning and larval drift of sympatric walleye and white suckers in an Ontario stream

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spawning, sucker, walleye, white suckers, reproduction, riffle, survival, Substrate, yellow perch, perch, eggs, predation, larvae, adult, food

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Transactions of the American Fisheries Society


Walleyes (Stizostedion vitreum vitreum) and white suckers (Catostomus commersoni)shared a common spawning ground in Apsley Creek. Their reproduction overlapped in time, butwhite suckers spawned mainly in the riffle zone (710 eggs/m2) and rarely in quiet water (0.5eggs/m 2) surrounding the riffle. In contrast, walleyes spawned more in quiet water (6,241eggs/m2) than in the riffle (65 eggs/m2). Walleye egg survival was higher on a sand-gravel-rocksubstrate than it was on a mud-detritus bottom. Spottail shiners Notropis hudsonius) and yellowperch (Perca flavescens) fed extensively on walleye eggs; predation on white sucker eggs wasnot detected. Larva drift of both species was passive, varying with stream velocity, and occurredduring periods of decreasing light (2100-0100 hours). Although eggs of both species beganhatching on May 7, white sucker larvae drifted 11-13 d after walleye larvae. There was noindication that walleyes and white suckers competed for spawning areas as adults or for food aslarvae.





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