Clinical signs include piping, '''dyspnoea''' and acute to subacute '''mortality'''. Chronic exposure generally results in extensive '''mucus secretion''' and '''hypertrophy''' of the gill epithelium. | Clinical signs include piping, '''dyspnoea''' and acute to subacute '''mortality'''. Chronic exposure generally results in extensive '''mucus secretion''' and '''hypertrophy''' of the gill epithelium. |