By A. D. F. Johnstone, D. Whitford, A. D. Hawkins
Water Research, Volume 16, Issue 11, 1982, Pages 1529-1535, ISSN 0043-1354, DOI: 10.1016/0043-1354(82)90204-4.

Thresholds for detection of cryolite recovery sludge (CRS, an aluminium smelter waste dumped at sea) were determined for salmon. Salmo salar (L.). in sea water using a cardiac conditioning technique. Some effects of exposure of salmon to CRS filtrate (mean concentration 5.5[degree sign]D) for up to 1 h were monitored. Oxygen consumption and ventilation rate increased and heart rate decreased after presentation of the filtrate. The effects were transient and the physiological parameters monitored returned to pre-exposure levels within 2 h of ceasing filtrate presentation. Detection levels for an amino acid (glycine) were determined for salmon in sea-water before and after exposure to CRS filtrate (mean concentration 5.5%). Within 24 h of exposure to the CRS filtrate the mean threshold level was significantly different from the pre-exposure detection level. However, 24-48 h after exposure the threshold for detection of glycine was no longer significantly different.

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