The further development of ionoregulatory measures as biomarkers of sensitivity and effect in fish species.

Abstract:

:Extensive season-by-season sampling was used to establish the normal range of whole-body Na+ and Cl- and Na+ uptake in healthy populations of two fish species, rainbow trout, Oncorhynchus mykiss, and fathead minnow, Pimephales promelas, of known differences in sensitivity to ionoregulatory toxicants (low pH, trace metals). These data together with responses of both species to six different ionoregulatory challenge tests of increasing severity (mild handling, exposure to low Ca2+ water, epinephrine injection, net-confinement stress, exposure to copper, and osmotic shock) were evaluated for their potential as biomarkers of sensitivity and of effect of ionoregulatory toxicants. There were no obvious biomarkers of sensitivity in the ion measures themselves, but four of the six challenges (exposure to low Ca2+ water, epinephrine injection, exposure to copper, and osmotic shock) produced a significantly greater effect in the more sensitive of the two species, fathead minnow. Based on the responses of both species, this article makes a number of recommendations for the application of ion measures alone and in combination with challenge tests to the assessment of chronic effects in populations experiencing sublethal ionoregulatory stress.

journal_name

Environ Toxicol Chem

authors

Croke SJ,McDonald DG

subject

Has Abstract

pub_date

2002-08-01 00:00:00

pages

1683-91

issue

8

eissn

0730-7268

issn

1552-8618

journal_volume

21

pub_type

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