Depth segregation of deepwater ciscoes (Coregonus spp.) in Lake Michigan during 1930–1932 and range expansion of Coregonus hoyi into deeper waters after the 1990s

2012 ◽  
Vol 63 ◽  
pp. 3-24
Author(s):  
David B. Bunnell ◽  
Randy L. Eshenroder ◽  
Ann E. Krause ◽  
Jean V. Adams
Keyword(s):  
Range Expansion ◽  
Lake Michigan ◽  
Coregonus Hoyi

Contaminant Residues in the Bloater (Coregonus Hoyi) of Lake Michigan, 1969–1986

1990 ◽  
Vol 16 (1) ◽  
pp. 121-129 ◽  
Author(s):  
Robert J. Hesselberg ◽  
James P. Hickey ◽  
David A. Nortrup ◽  
Wayne A. Willford
Keyword(s):  
Lake Michigan ◽  
Coregonus Hoyi

Modeling time-varying growth using a generalized von Bertalanffy model with application to bloater (Coregonus hoyi) growth dynamics in Lake Michigan

2003 ◽  
Vol 60 (1) ◽  
pp. 55-66 ◽  
Author(s):  
Emily B Szalai ◽  
Guy W Fleischer ◽  
James R Bence
Keyword(s):  
Growth Regulation ◽  
Lake Michigan ◽  
Growth Parameters ◽  
Power Relationship ◽  
Time Varying ◽  
Von Bertalanffy ◽  
Density Dependent ◽  
Von Bertalanffy Model ◽  
Dependent Growth ◽  
Coregonus Hoyi

A concurrent increase in lakewide abundance and decrease in size-at-age of bloater (Coregonus hoyi) in Lake Michigan have suggested density-dependent growth regulation. We investigated these temporal patterns by fitting a dynamic von Bertalanffy model and length–weight relationship with time-varying parameters to mean length- and weight-at-ages (ages 1–7) from annual surveys (1965–1999). We modeled yearling length, asymptotic size (L[Formula: see text]), and the parameters of a power relationship between mean weight and mean length (α and β) as changing slowly over time using a random walk model. The Brody growth coefficient (k) was modeled as a linear function of L[Formula: see text] with year-specific random deviations. Our results support a positive relationship between L[Formula: see text] and k, indicating that under conditions supporting larger asymptotic lengths, individuals approach the asymptote more rapidly. We explored the relationship between year-specific growth parameters and indices of lakewide bloater abundance and found evidence of density-dependent growth. However, in the most recent years, L[Formula: see text] and yearling length have remained low in Lake Michigan despite low bloater abundances, suggesting the occurrence of a fundamental shift in the food web.

Effects of Dressing and Cooking on DDT Concentrations in Certain Fish from Lake Michigan

1972 ◽  
Vol 29 (5) ◽  
pp. 525-529 ◽  
Author(s):  
Robert E. Reinert ◽  
Donald Stewart ◽  
Harry L. Seagran
Keyword(s):  
Yellow Perch ◽  
Oil Content ◽  
Lake Michigan ◽  
Lake Trout ◽  
Coho Salmon ◽  
Corn Oil ◽  
Perca Flavescens ◽  
Salvelinus Namaycush ◽  
The Body ◽  
Coregonus Hoyi

Concentrations of DDT residues were highest in parts of the body with the highest oil content in four species of fish from Lake Michigan: yellow perch (Perca flavescens), bloater (Coregonus hoyi), lake trout (Salvelinus namaycush), and coho salmon (Oncorhynchus kisutch). Dressing reduced the DDT residues and oil content by more than 90% in yellow perch but had little effect in the other three species. The concentration of DDT residues in bloaters was changed little by smoking but was reduced 64–72% by other methods of cooking: from 8.0 ppm (raw) to 2.2 ppm after frying in corn oil; from 10.7 to 3.9 ppm after frying in lard; and from 9.1 to 3.2 ppm after broiling. The concentration of DDT residues in fillets of yellow perch changed only from 0.3 ppm (raw) to 0.4 or 0.5 ppm after baking, frying, or broiling.

Feeding-Behavior Repertoire of the Alewife, Alosa pseudoharengus, and the Ciscoes Coregonus hoyi and C. artedii

1978 ◽  
Vol 35 (2) ◽  
pp. 249-253 ◽  
Author(s):  
John Janssen
Keyword(s):  
Great Lakes ◽  
Feeding Behavior ◽  
Key Words ◽  
Lake Michigan ◽  
Alosa Pseudoharengus ◽  
Calanoid Copepods ◽  
Mysis Relicta ◽  
Particulate Feeding ◽  
Coregonus Hoyi

Particulate feeding, where fish orient to and take prey one at a time, is shown by the alewife, Alosa pseudoharengus, and the ciscoes Coregonus hoyi and C. artedii. Specialized particulate feeding is found in ciscoes and alewives for capturing strongly swimming prey such as Mysis relicta and calanoid copepods. This involves simultaneous darting and sucking. Alewives filter feed by swimming with the mouth fully agape for 0.5–2 s while driving hard with the tail. Ciscoes do not filter feed, but they and alewives display gulping behavior where fish open and close the mouth 2–3 times/s, do not drive hard with the tail, and may take more than one prey per gulp. The alewife has difficulty feeding near or on the bottom. The ciscoes feed easily on or near the bottom and will also take buried prey. Key words: Alosa pseudoharengus, Coregonus hoyi, C. artedii, feeding behavior, Great Lakes, Lake Michigan

Long-term trends of bloater (Coregonus hoyi) recruitment in Lake Michigan: evidence for the effect of sex ratio

2006 ◽  
Vol 63 (4) ◽  
pp. 832-844 ◽  
Author(s):  
David B Bunnell ◽  
Charles P Madenjian ◽  
Thomas E Croley II
Keyword(s):  
Time Series ◽  
Sex Ratio ◽  
Egg Production ◽  
Lake Michigan ◽  
Linear Models ◽  
Spring Temperature ◽  
Intrinsic Factors ◽  
Underlying Mechanisms ◽  
Coregonus Hoyi

Long-term population trends are generally explained by factors extrinsic (e.g., climate, predation) rather than intrinsic (e.g., genetics, maternal effects) to the population. We sought to understand the long-term population dynamics of an important native Lake Michigan prey fish, the bloater Coregonus hoyi. Over a 38-year time series, three 10- to 15-year phases occurred (poor, excellent, and then poor recruitment) without high interannual variability within a particular phase. We used dynamic linear models to determine whether extrinsic (winter and spring temperature, alewife predator densities) or intrinsic factors (population egg production, adult condition, adult sex ratio) explained variation in recruitment. Models that included population egg production, sex ratio, winter and spring temperature, and adult bloater condition explained the most variation. Of these variables, sex ratio, which ranged from 47% to 97% female across the time series, consistently had the greatest effect: recruitment declined with female predominance. Including biomass of adult alewife predators in the models did not explain additional variation. Overall our results indicated that bloater recruitment is linked to its sex ratio, but understanding the underlying mechanisms will require additional efforts.

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