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The average lethal concentration of un-ionized ammonia (48-h LC 50 NH 3 ) has been determined by the static assay for larvae (0.48mg l -1 ) and alevins (0.92mg l -1 ) of 'pacama'Lophiosilurus alexandri. Studies by light and scanning electron microscopes at the greatest concentration of NH 3 (0.99mg l -1 for larvae and 1.5mg l ...
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