Age determination of Manitoban walleyes using otoliths, dorsal spines, and scales.
Master's Thesis, University of Minnesota, St. A growth history of Red Lake walleye ( Stizostedion vitreum) developed through scale analysis. Cannibalism as a factor in first year survival of walleye in Oneida Lake. Gill (ed.) The Biology of Fish Growth, Academic Press, New York.Ĭhevalier, J.R. Pulos (ed.) Proceedings of the International Workshop on Age Determination of Oceanic Pelagic Fishes: Tunas, Billfishes, and Sharks, U.S. Age and growth assessment of fish from their calcified structures - techniques and tools. Age, growth, sexual maturity, and population fluctuations of the yellow pike-perch, ( Stizostedion vitreum) (Mitchill), with reference to the commercial fisheries, Lake of the Woods, Minnesota. 8, Academic Press, New York.Ĭarlander, K.D. Comparison of five ageing methodologies applied to walleye ( Stizostedion vitreum) in Burt Lake, Michigan. Circuli spacing and annulus formation: is there more than meets the eye? The case for sokeye salmon, Oncorhynchus nerka. The growth coefficients of drum were significantly positively correlated with the walleye coefficients, and the significance increased if the poorest walleye growth years were excluded.īarber, W.E. As a test, environmental growth coefficients computed by Pereira (1992) for freshwater drum were compared to walleye growth coefficients. We expected the set of factors which affect freshwater drum, Aplodinotus grunniens, to include factors that affect walleye, such as temperature, shared prey availability, and abundance of both walleye and drum. Significant predictors of YOY walleye growth were May, June, and August cumulative degree days, as well as the growth of older walleye.
#CIRCULI SPACING AND ANNULUS FORMATION SERIES#
We hypothesized that YOY walleye respond to a different set of factors than walleye after age one, thus, a series of YOY growth measurements would show coherence to a different set of environmental factors. Significant predictors of the growth of walleye after age one were average February temperature, cumulative degree days in July, walleye year-class strength, and growth of young-of-the-year (YOY) walleye. Multiple regression techniques were used to test these hypotheses. Our hypothesis was that variables such as air temperature, walleye year-class strength, catch-per-unit-effort (CPUE) of walleye, and CPUE of yellow perch, Perca flavescens, affect walleye growth, and therefore a historical series of these variables would show coherence to the series of walleye growth coefficients. Increment size was separated into one component due to a combination of environmental factors, an environmental growth coefficient, and one due to the age of the fish. This was accomplished using a linear model which was fitted to annular scale increment measurements. An environmental growth history of commercially harvested walleye, Stizostedion vitreum, in Red Lakes, Minnesota, was constructed for the years 1944–1992.
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