Optimizing fish sampling for fish - mercury bioaccumulation factors

Chemosphere
By: , and 

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Abstract

Fish Bioaccumulation Factors (BAFs; ratios of mercury (Hg) in fish (Hgfish) and water (Hgwater)) are used to develop Total Maximum Daily Load and water quality criteria for Hg-impaired waters. Both applications require representative Hgfish estimates and, thus, are sensitive to sampling and data-treatment methods. Data collected by fixed protocol from 11 streams in 5 states distributed across the US were used to assess the effects of Hgfish normalization/standardization methods and fish sample numbers on BAF estimates. Fish length, followed by weight, was most correlated to adult top-predator Hgfish. Site-specific BAFs based on length-normalized and standardized Hgfish estimates demonstrated up to 50% less variability than those based on non-normalized Hgfish. Permutation analysis indicated that length-normalized and standardized Hgfish estimates based on at least 8 trout or 5 bass resulted in mean Hgfish coefficients of variation less than 20%. These results are intended to support regulatory mercury monitoring and load-reduction program improvements.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Optimizing fish sampling for fish - mercury bioaccumulation factors
Series title Chemosphere
DOI 10.1016/j.chemosphere.2014.12.068
Volume 135
Year Published 2015
Language English
Publisher Elsevier
Contributing office(s) Toxic Substances Hydrology Program, South Carolina Water Science Center
Description 7 p.
First page 467
Last page 473
Online Only (Y/N) N
Additional Online Files (Y/N) N