Parlando ancora di citazione di articoli scientifici...
Altra citazione (in "Nitrate Toxicity on Visceral Organs of Medaka Fish, Oryzias latipes: Aiming to Raise Fish from Egg to Egg in Space" di R. Shimura et Al., Biological Sciences in Sp. 18, 2004):
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Histological survey was made to determine nitrate toxicity on the Medaka fish, Oryzias latipes. In order to investigate the effects of short-term exposure to nitrate, one-month-old Medaka fish was exposed to NaNO3 at concentrations of 100 and 125 mg NO3 l-1 for 96 hours. At the end of the exposure period, survival rate was found to be 30% and 10%, for the 100 and 125 mg NO3
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Eggs treated with NaNO3 hatched within 10 days after fertilization. At the end of the exposure period, survival rate in the 100 and 125 mg NO3-N l-1 treatments were 40% and 30%, respectively. Fibrosis of the hepatic cells and curved spinal column were observed in the juveniles subjected to long-term nitrate exposure.
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Quindi resistenti ai nitrati non direi! Depongono e schiudono pure in condizioni limite, ma ne risentono eccome (stupirebbe il contrario).
Sono MOLTO diffusi nella ricerca (soprattutto genetica) perché (come i danio) sono un "organismo modello" (crescono velocemente e si riproducono facilmente anche in condizioni limite).
L'articolo lo trovate qui:
http://www.ncbi.nlm.nih.gov/pubmed/15173627