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Optimizing fish sampling for fish-mercury bioaccumulation factors.

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Accurate fish bioaccumulation factors (BAFs) are crucial for mercury (Hg) water quality criteria. Normalizing fish mercury (Hgfish) data by length and using sufficient fish samples (e.g., 8 trout or 5 bass) reduces BAF variability.

Keywords:
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Area of Science:

  • Environmental Chemistry
  • Aquatic Toxicology
  • Ecotoxicology

Background:

  • Fish Bioaccumulation Factors (BAFs) are essential for assessing mercury (Hg) contamination in aquatic ecosystems.
  • Accurate BAFs are critical for developing total maximum daily load (TMDL) and water quality criteria for mercury-impaired waters.
  • Estimates of mercury in fish (Hgfish) are sensitive to sampling and data processing methods.

Purpose of the Study:

  • To evaluate the impact of different normalization/standardization methods and fish sample sizes on BAF estimates.
  • To identify optimal methods for obtaining representative Hgfish estimates for regulatory applications.

Main Methods:

  • Utilized data from a fixed protocol study across 11 streams in 5 US states.
  • Assessed the correlation between fish length, weight, and Hgfish concentrations.
  • Applied normalization and standardization techniques to Hgfish data.
  • Employed permutation analysis to determine the required number of fish samples for specific species (trout, bass) to achieve low variability in Hgfish estimates.

Main Results:

  • Fish length was the strongest predictor of Hgfish concentration in adult top predators, followed by weight.
  • Site-specific BAFs derived from length-normalized and standardized Hgfish estimates showed up to 50% less variability compared to non-normalized estimates.
  • Permutation analysis revealed that using at least 8 trout or 5 bass, with length-normalized and standardized Hgfish data, resulted in coefficients of variation below 20%.

Conclusions:

  • Length normalization and standardization are effective in reducing variability in Hgfish estimates.
  • Specific sample sizes for key fish species are recommended to ensure reliable BAF calculations.
  • These findings can enhance regulatory mercury monitoring and inform improvements in load-reduction programs.