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    Salinity Tolerance Of Northern Redbelly Dace, Phoxinus eos, As Assessed By A 96-Hour Acute Toxicity Test

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    2000_BuckT_THS_000232.pdf (1.660Mb)
    Author
    Buck, Teresa
    Advisor
    John Addis; Carol Endicott; Don Skaar
    Date of Issue
    2000-04-01
    Subject Keywords
    Northern Redbelly Dace, Phoxinus eos
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    URI
    https://scholars.carroll.edu/handle/20.500.12647/2832
    Title
    Salinity Tolerance Of Northern Redbelly Dace, Phoxinus eos, As Assessed By A 96-Hour Acute Toxicity Test
    Type
    thesis
    Abstract
    Saline seeps are a known environmental hazard in eastern Montana. Identifying the salinity threshold value for fish using a 96-hour acute toxicity test will allow fish salinity tolerance to be taken into account when biotic integrity is used to determine the health of a waterbody. Acute toxicity tests were run 10 fish per 8 gallons of test solution in glass aquaria. The test solution was made using Na2SC>4 dissolved in carbon filtered city water and was renewed after 48 hours. Mortalities were counted and removed every 6 hours for the first 24 hours and every 12 hours there after. Results obtained from the 96-hour acute toxicity test determined the LC50 range to be 10-20 g/L using the binomial method. The geometric mean being 14.1 g/L. Results from a follow up experiment showing 100% mortality at 13 g/L lead to the conclusion that the actual LC50 lies below 14.1 g/L. The calculated LC50 value of 14.1 g/L leads to the conclusion that northern redbelly dace are a salt tolerant species well adapted to the saline waters of eastern Montana. Affected streams in eastern Montana that have salinity levels regularly approaching 9 g/L are approaching toxic levels.
    Degree Awarded
    Bachelor's
    Semester
    Spring
    Department
    Life & Environmental Sciences
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    • Life and Environmental Sciences Undergraduate Theses

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