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- W2792693322 abstract "Metapenaeus ensis larvae at various stages were exposed by static renewal method to different concentrations of ammonia (NH3 + NH4 +) in seawater at 33 ppt, pH 8.10 and temperature 30°C. The 24-hour median lethal concentration (LC50) values were 10.33, 4.82, 35.97, 30.33 and 24.39 mg-l•l ammonia-N (un-ionized plus ionized ammonia as nitrogen); and 0.65, 0.30, 2.25, 1.90 and 1.53 mg-1·1 NH3 -N (un-ionized ammonia as nitrogen) for nauplius third substage (N3), zoea second substage (Z2), mysis second substage (M2), postlarvae first and tenth substage (PLl, PLl0). The 48- hour Lc50 values for M2 and PLl were 21.43 and 16.74 mg·l· ammonia-N, and 1.34 and 1.05 mg·I-1 NH3-N. The threshold time was 108 hours and the incipient LC50 was 3.04 mg-1-l ammonia-N and 0.22 mg-1·1 NH3-N for PLl. The LC50 values of ammonia-N and NH3 -N decreased with longer exposure. Among the developmental stages of M. ensis larvae tested, zoea larvae were the least tolerant and mysis larvae the most tolerant to ammonia. The concentrations less than 0.30 mg-1-l ammonia-N and 0.02 mg•1-l NHg-N are considered safe for rearing M. ensis in the hatchery." @default.
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- W2792693322 date "1991-03-01" @default.
- W2792693322 modified "2023-10-11" @default.
- W2792693322 title "Acute Toxicity of Ammonia to Larval Metapenaeus ensis" @default.
- W2792693322 doi "https://doi.org/10.33997/j.afs.1991.4.1.005" @default.
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