An evaluation of Lake Michigan alewife aging methodologies, growth, and stock separation

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dc.contributor.advisor Lauer, Thomas E. en_US Labay, Steven R. en_US
dc.coverage.spatial nl----- en_US 2011-06-03T19:40:46Z 2011-06-03T19:40:46Z 2005 en_US 2005
dc.identifier LD2489.Z78 2005 .L33 en_US
dc.description.abstract Ageing methodologies of Lake Michigan alewife were evaluated as a precursor to growth and condition investigations of alewife stocks. Four commonly used aging tissues were evaluated including: otoliths, scales, vertebrae, and opercles. Otoliths were significantly more precise than other structures in all analyses. The accuracy of age determinations given by otoliths was corroborated through length frequency analysis. Total processing time was highest for scales. Whole otolith methodology was used to age alewives from Indiana, Michigan, and Wisconsin based on precision, accuracy, and time efficiency. A trend of higher median lengths and weights in young fish from the Green Bay, Wisconsin site was identified. Older fish grew faster in the main-lake sample sites near Pentwater, Michigan and Indiana waters. The Indiana population had the highest condition factor (K), while Wisconsin had the lowest, with Michigan in between. An overall temporal decline in condition of alewife was identified when compared with historical studies. This is a consideration that may influence salmonid stocking decisions because the alewife serves as their primary food.
dc.description.sponsorship Department of Biology
dc.format.extent vii, 124 leaves : ill., map ; 28 cm. en_US
dc.source Virtual Press en_US
dc.subject.lcsh Alewife -- Michigan, Lake -- Age determination. en_US
dc.subject.lcsh Fish populations -- Michigan, Lake. en_US
dc.title An evaluation of Lake Michigan alewife aging methodologies, growth, and stock separation en_US Thesis (M.S.)
dc.identifier.cardcat-url en_US

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  • Master's Theses [5510]
    Master's theses submitted to the Graduate School by Ball State University master's degree candidates in partial fulfillment of degree requirements.

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