Toxicidade aguda da amônia no processo produtivo de pós-larvas de Penaeus paulensis Pérez-Farfante, 1967 / Acute toxicity of ammonia in the productivity process of postlarvae of Penaeus paulensis Pérez-Farfante, 1967
An. acad. bras. ciênc
;
64(4): 383-9, dez. 1992. tab
Article
in Portuguese
| LILACS
| ID: lil-113467
RESUMO
Larval shrimp Penaeus paulensis showed a tendency to decrease in ammonia tolerance as the larva metamorphosed from nauplius to postlarvae stage. The 24-h LC50 were 4.04, 1.70, 2.72, and 1.42mg/l NH3-N on nauplii, zoea, mysis and postlarvae, respectively. The zoea stage and the initial postlarvae substages were very susceptible to ammonia. The 96-h LC50 values on zoea and postlarvae were 0.69 mg/l and 0.32 mg/l, against 0.80 mg/l NH3-N on mysis. The eggs of Penaeus paulensis were affected by ammnia, which provoked a progressive decrease in the hatching rate and induced morphological deformities in hatched nauplii. A "safe level" of ammonia was estimated at 0.032 mg/l NH3-N on the basis of 24-h LC50 for eggs
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Index:
LILACS (Americas)
Main subject:
Decapoda
/
Ammonia
Limits:
Animals
Country/Region as subject:
South America
/
Brazil
Language:
Portuguese
Journal:
An. acad. bras. ciênc
Journal subject:
Science
Year:
1992
Type:
Article
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