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  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Nutritional components of forage-based food systems and their contribution to growth of juvenile crawfish (Procambarus clarkii)
  name:
    name part: McClain, William Ray
    name part: 1953-
    role:
      role term: creator
  name:
    name part: Gatlin, Delbert M.
    role:
      role term: degree supervisor.
  name:
    name part: Neill, William H.
    role:
      role term: degree supervisor.
  name:
    name part: Davis, James T.
    role:
      role term: degree committee member.
  name:
    name part: Rowe, Gilbert T.
    role:
      role term: degree committee member.
  name:
    name part: Texas A & M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  genre: Academic theses
  origin info:
    place:
      place term: xx
    date issued: 1990
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: xii, 116 leaves : illustrations ; 29 cm
  abstract: Commercial crawfish aquaculture in the United States presently depends primarily on a forage-based food system, with rice (Oryza sativa) being the major forage. More precise nutritional information about this forage-based system should facilitate its management for crawfish production. Therefore, this study was conducted to determine the nutrient composition of rice during decomposition, to determine the gross trends in biomass of associated microorganisms and their effect on crawfish growth, and to estimate the contribution of separable fractions of available food resources to crawfish growth. A three-part approach was undertaken to address these objectives. In part one, preboot rice (variety Mars) underwent aerobic decomposition at 22.5[plus or minus]1.5°C with pond water and soil for various intervals of time. Nutrient profiles (ash, crude protein, crude lipid, cell-wall content and C:N ratio) of rice and its products of decomposition varied according to plant portion and decomposition time. In general, decomposition decreased crude lipid content and C:N ratio while ash, cell-wall and protein contents increased over time. The second part of the research consisted of a series of feeding experiments in a flow-through tank system to assess the contribution of single feedstuffs to growth of juvenile crawfish (Procambarus clarkii) housed individually. The ability of juvenile crawfish to use plant components for growth was limited, compared with their ability to use a prepared feed (Dupont's Crawdeaux[TM]); and, their ability to use detritus varied directly with the total biomass of associated microbes. The last part of the research focused on crawfish growth in static-water microcosms with and without various components of the detrital food chain and the prepared feed. The growth data were used to fit a multiple linear model with zero intercept to estimate contribution to growth from separable components of the treatments. These were--in order of importance--prepared …
  note: Typescript (photocopy).
  note: Vita.
  note: "Major subject: Wildlife and fisheries science."
  note: Ph. D. Texas A & M University 1990
  note: Includes bibliographical references.
  subject:
    topic: Crayfish
    topic: Nutrition
  subject:
    topic: Procambarus clarkii
    topic: Growth
  subject:
    topic: Forage plants
  subject:
    topic: Rice
    topic: Nutrition
  subject:
    topic: Major wildlife and fisheries sciences
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  identifier: http://proxy.library.tamu.edu/login
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  record info:
    record content source: TXA
    record creation date: 910121
    record change date: 20200904152519.0
    record identifier: in00000998271
    language of cataloging:
      language term: eng