Rainbow trout fry was chronically exposed (54 days) to 0.2 mg l −1 LAS(C 11–12 ). Although this concentration is considered to be the NOEC (no observed effect concentration), lamellar gill epithelia hypertrophied and swimming capacity was reduced. Furthermore, the exposure of the fish to a secondary stressor (low salinity challenge test) caused increased mortality. Un-ionized ammonia did not affect the above-mentioned parameters when fish were treated with a NOEC of 24 μg 1 −1 . At 72 μg l −1 , however, un-ionized ammonia caused distinct hypertrophy of gill epithelia. This effect was significantly enhanced when combined with LAS (additive effect). Only in this group, growth was reduced.
Water Research – Elsevier
Published: Dec 1, 1995
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