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Chronic effects of ammonia were studied in three batches of turbot (Scophthalmus maximus) juveniles (14, 23 and 104 g) exposed for 4-6 weeks to constant ammonium chloride solutions. Under the environmental conditions used (16.5-17.5°C, pH 7.92-8.03, salinity 34.5 ppt, over 80% oxygen saturation), no mortalities occurred up to 0.4 mg unionised ammonia (UIA-N) 1 -1 , i.e. 10 mg total ammonia...
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