Title page for ETD etd-07072010-110814

Type of Document Master's Thesis
Author Fries, Melissa Ann
URN etd-07072010-110814
Title Introgression, Health, and Condition of Florida, Northern, and Fx Hybrid Largemouth Bass in Louisiana Water Bodies
Degree Master of Science (M.S.)
Department Renewable Natural Resources
Advisory Committee
Advisor Name Title
Kelso, William E. Committee Chair
Kaller, Michael D. Committee Member
Rutherford, D. Allen Committee Member
  • Louisiana
  • Largemouth bass
  • introgression
  • Florida
  • hybrid
  • growth
  • habitat
  • stocking
Date of Defense 2010-06-25
Availability unrestricted
Since 1982, the Louisiana Department of Wildlife and Fisheries (LDWF) has stocked Florida-strain largemouth bass (FLMB; Micropterus salmoides floridanus) to incorporate Florida alleles into native populations (NLMB; M. s. salmoides) and enhance recreational fishing opportunities. I collected habitat data and largemouth bass samples from 12 LDWF stocked reservoirs and disconnected oxbow lakes to examine the relationships between reservoir characteristics, genetic identity, relative weight (Wr), liver somatic index (LSI), parasite loads, and back-calculated length-at-age. I examined the relationships between water body and genetic identity with Wr, LSI, and back-calculated length-at-age by ANOVA. Parasite loads were analyzed with ordinal regression. Principle component analysis was used to reduce the dataset into a smaller number of principal components and group the study lakes as habitat types. I then used ANOVA to assess whether Wr, LSI, or length-at-age were influenced by genetic strain or habitat type as represented by the principal components and logistic regression to determine whether principal component influenced the abundance of NLMB or non-native largemouth bass. Although similar across bass strains, Wr, LSI, and length-at-age varied by lake (all P<0.0001). Parasite loads were not significantly different between years or among water bodies or genetic strain. Based on the ANOVA results, shallow, nutrient rich lakes with high chlorophyll a concentrations and large littoral zones appeared to promote high Wr and non-native largemouth bass. Conversely, northern largemouth bass were more prevalent, and Wr was lower, in lakes with dense vegetation. Aquatic macrophytes may reduce foraging efficiency of larger, piscivorous fish while increasing survival of young-of-the-year largemouth bass. Reservoirs with little vegetative cover may reduce natural recruitment of resident largemouth bass allowing rapid genetic introgression. These findings may improve our understanding of the effects of FLMB stocking activities and provide the opportunity to modify stocking protocols to better achieve the management goals of the largemouth bass program.
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