Lack of Angling-Sized Yellow Perch in a Canadian Boreal Lake: Potential Influences of Growth Rate, Diet, and Predation by Double-Crested Cormorants

摘要: Abstract Fisheries for yellow perch Perca flavescens are economically important in North America, but many lakes this species does not attain sizes desirable to anglers (total length [TL] > 250 mm). We investigated factors potentially contributing the lack of angling-sized Dore Lake, Saskatchewan. This large boreal lake has a long history exploitation and is subject current controversy regarding impact double-crested cormorants Phalacrocorax auritus on its fisheries. found that Lake attained greater maximum ages (mean ± SD = 7.4 1.0 years) smaller (215 7 mm TL) than other populations. Thus, probably result slow growth rates rather short life spans. Double-crested preyed heavily perch, predation was highly skewed toward much (<100 those preferred by anglers. Stomach contents stable nitrogen iso...