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mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Production of Tilapia aurea in simulated sewage lagoons receiving laying hen wastes
  name:
    name part: McGeachin, Robert Bruce.
    role:
      role term: creator
  name:
    name part: Rowland, Lenton O.
    role:
      role term: degree committee member.
  name:
    name part: Stickney, Robert R.
    role:
      role term: degree supervisor.
  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: 1980
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: ix, 71 leaves : illustrations, graphs ; 29 cm
  abstract: Experiments were carried out in the summers of 1978 and 1979 in 12 outdoor plastic-lined circular wading pools (about 7 m('2) in area) at the Aquaculture Research Center of the Texas Agricultural Experiment Station near College Station to determine the optimum manuring rate for fresh laying hen wastes in simulated sewage lagoons stocked with all-male Tilapia aurea (50 fish/pool). One and one-half year old laying hens were maintained in cages suspended over the pools and supplied direct, constant manure input. Four experimental manuring rates with three replicate pools of each were used each year. The extrapolated manuring rate treatments for 1978 were 0, 35, 70, and 140 kg dry weight of manure/ha/day and for 1979 were 70, 140, 210, and 280 kg dry weight of manure/ha/day. The results of tilapia growth and survival, and water quality data indicated that the optimum range of manuring rate with laying hen wastes for the summer months lies from 70 to 140 kg dry weight of manure/ha/day, depending on the alkalinity of the water. In the 1979 experiment highly alkaline water was found to be detrimental to proper functioning of the sewage lagoon system and tilapia production in it. The high buffering capacity of the alkaline waters (above about 400 mg/liter as CaCO(,3)) prevented the normal diurnal pH shift which would have allowed direct volatilization of ammonia from the system; a major mechanism of ammonia removal. As a result, ammonia accumulated in the pools at much higher levels than it did at the same manuring rates in the 1978 experiment which had only moderately alkaline water. The tilapia at the 140, 210, and 280 kg dry weight of manure/ha/day treatments in 1979 did not tolerate the high levels of ammonia which may have acted synergistically with low dissolved oxygen levels to kill all the tilapia in these treatments. These results indicated the need for a laboratory study to determine if there are synergistic effects on Tilapia aurea between high ammonia and low di…
  note: "Major subject: Wildlife and Fisheries Sciences."
  note: Typescript (photocopy).
  note: Vita.
  note: Ph. D. Texas A & M University 1980
  note: Includes bibliographical references (leaves 63-70).
  subject:
    topic: Poultry
    topic: Manure
  subject:
    topic: Sewage lagoons
  subject:
    topic: Tilapia aurea
  subject:
    topic: Tilapia
    topic: Feeding and feeds
  subject:
    topic: Tilapia
    topic: Growth
  subject:
    topic: Water quality
  subject:
    topic: Major wildlife and fisheries sciences
  identifier: http://proxy.library.tamu.edu/login
  identifier: https://hdl.handle.net/1969.1/DISSERTATIONS-667194
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: https://hdl.handle.net/1969.1/DISSERTATIONS-667194
  record info:
    record content source: TXA
    record creation date: 810727
    record change date: 20220104090458.0
    record identifier: in00000654779
    language of cataloging:
      language term: eng