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Aquaculture/Fisheries Center Research Highlights
Water Quality
 
  1. Effects of high drift rate of atrazine (Basis Gold) and propanil on plankton and water quality in a fertilized sunshine bass fry pond
    Peter Perschbacher and Gerald Ludwig

    Propanil and Basis Gold, major component atrazine, were tested on fertilized sunshine bass fry pond water at worst case drift rates of 30% of field application, higher concentrations than may occur in larger ponds. No serious impacts on fry survival and production were detected. Dissolved oxygen was slightly lower for several days following application. With the lower pH, unionized ammonia was lower as well. The main impact was to reduce numbers of the cyanobacteria Chroococcus sp, however green and diatom algae were stimulated. The low chlorophyll a levels of fry ponds is judged to have reduced the impacts from atrazine and propanil.
     
  2. Effects of Aquashade on phytoplankton in sunshine bass fry ponds
    Peter Perschbacher and Gerald Ludwig

    Addition of aquashade to fry ponds to reduce benthic plant growth did not affect phytoplankton composition or biomass. Study will be repeated in 2006 pond with fry.
     
  3. Effects of horizontal and vertical water blenders on channel catfish pond phytoplankton
    Peter Perschbacher and Bart Green

    Horizontal water blender (slow rpm paddlewheel) and solar upweller (Solarbee) did not affect phytoplankton, including off-flavor and scum forming cyanobacteria.
     
  4. Effects of high dosages of sodium bicarbonate on phytoplankton in an organic and inorganic fertilization protocol for sunshine bass fry ponds
    Peter Perschbacher, Gerald Ludwig and Melissa Hobbs

    Additions of 113 and 226 kg/ha sodium bicarbonate to fertilized pond water for pH
    control resulted in higher alkalinity, but unchanged pH and phytoplankton composition or
    biomass.
     
  5. Effects of new herbicides on pond plankton and water quality
    Peter Perschbacher

    The herbicides Clincher (cyhalofop), Regiment (bispyribac), Liberty (glufosinate ammonia), Poast (sethoxydim) and ricestar (fenoxoprop) were evaluated and produced no measurable effects on plankton or water quality

     
 
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