Title page for ETD etd-12222008-102753


Type of Document Master's Thesis
Author Vincie, Meghann Elizabeth
Author's Email Address mevincie@vt.edu
URN etd-12222008-102753
Title Development of a suitable diet for endangered juvenile oyster mussels, Epioblasma capsaeformis (Bivalvia:Unionidae), reared in a captive environment
Degree Master of Science
Department Fisheries and Wildlife Sciences
Advisory Committee
Advisor Name Title
Neves, Richard J. Committee Chair
Craig, Steven R. Committee Co-Chair
Gatenby, Catherine M. Committee Member
McLean, Ewen W. Committee Member
Keywords
  • Epioblasma capsaeformis
  • bioflocs
  • juvenile culture
  • biochemical composition
  • gut content
  • juvenile diets
  • Unionidae
  • freshwater mussels
Date of Defense 2008-08-25
Availability unrestricted
Abstract

Epioblasma capsaeformis, commonly named the oyster mussel, once occupied thousands of miles of stream reaches, but has now been reduced in range to small, isolated populations in a few river reaches. Due to this significant decline in population numbers, a study was conducted to develop a diet for propagating this endangered species under captive conditions. Oyster mussel juveniles were collected from several sites on the Clinch River and sacrificed for gut content and biochemical composition analyses in summer. Feces and pseudofeces from live river-collected juveniles were examined seasonally for algae, detritus, and bacteria to qualitatively determine diet of specimens. Two feeding trials also were conducted in this study to evaluate effect of diet (commercial and non-commercial diets), on growth and survival of oyster mussel juveniles.

From examination of gut contents, fecal and pseudofecal samples, it was apparent that algae and a significant amount of detritus (~90%) composed wild juvenile diets. E. capsaeformis juveniles (1-3 y of age) could have fed on particles up to 20 µm in size and seemed they were mostly ingesting particles within the 1.5-12 µm size range. Protein content of sacrificed juveniles ranged from 313 to 884 mg/g and was highly variable. Glycogen content ranged from 49-171 mg/g. Caloric content of four juveniles ranged from 2,935.10 to 4,287.94 cal/g, providing a preliminary baseline range for future energetic studies on freshwater mussels.

Growth was significantly higher in those juveniles fed the triple concentration algae-mix (62,076 cells/ml) than all other diets tested in trial 1. Results of both feeding trials indicated that survival of juvenile oyster mussels was enhanced when fed an algal diet supplemented by bioflocs.

Files
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
  RevisedETD3.pdf 769.28 Kb 00:03:33 00:01:49 00:01:36 00:00:48 00:00:04

Browse All Available ETDs by ( Author | Department )

dla home
etds imagebase journals news ereserve special collections
virgnia tech home contact dla university libraries

If you have questions or technical problems, please Contact DLA.