Copper, (Cu) is essential to the growth and metabolism, of fish and other aquatic life.
But it can cause irreversible harm at levels slightly higher than those required for growth and reproduction.
Very low concentrations of dissolved copper can have acute and chronic toxic effects on fish and they're prey..
Giattina et al, observed that at sub-lethal, concentrations of copper, rainbow trout, avoided contaminated water, but as levels gradually increased, individuals were attracted f higher concentrations that are considered lethal
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