thumbnail

Effect of stream acidification and inorganic aluminum on mortality of brook trout (Salvelinus fontinalis) in the Catskill Mountains, New York

Canadian Journal of Fisheries and Aquatic Sciences

By:
,
DOI: 10.1139/cjfas-54-3-603

Links

Abstract

Juvenile brook trout (Salvelinus fontinalis) were exposed in cages to fluctuating chemical conditions in four Catskill Mountain streams during the spring and fall of 1989 and the spring of 1990. Specific chemical constituents and characteristics of acidic episodes that correlated with increased fish mortality were identified. Mortality increased during acidic episodes in one poorly buffered stream when inorganic monomeric aluminum (Al(im)) concentrations increased; mortality was low in three other streams during acidic episodes of shorter duration and smaller magnitude than measured in the poorly buffered stream. Variation in mortality was attributed primarily to differences in concentrations of both Al(im) and dissolved organic carbon. Linear and logistic regression analyses indicate that either mean or median Al(im) concentrations could account for 73-99% of the variability in mortality. Regression analyses suggest that mortality was highly related (in order of importance) to Al(im), pH, dissolved organic carbon, calcium, and chloride concentration. Brook trout mortality was also highly related to durations of exposure above 0.225 and 0.250 mg/L Al(im) during test periods. Characteristics of acidic-Al(im) episodes that are critical to mortality of caged brook trout appear to be (i) Al(im) concentrations of at least 0.225 ?? 0.025 mg/L and (ii) exposure to these toxic Al(im) concentrations for at least 2 days.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Effect of stream acidification and inorganic aluminum on mortality of brook trout (Salvelinus fontinalis) in the Catskill Mountains, New York
Series title:
Canadian Journal of Fisheries and Aquatic Sciences
DOI:
10.1139/cjfas-54-3-603
Volume
54
Issue:
3
Year Published:
1997
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
603
Last page:
615
Number of Pages:
13