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We quantified thiamine in eggs of Lake Erie walleye to determine if differences exist between spawning stocks within the Maumee and Sandusky rivers, both of which drain into the Western Basin. In spring 2004, eggs of walleye were collected in the Maumee River at three occasions (early, peak and late of the spawning run) and in the Sandusky River during the spawning run. After collection, eggs were...