Table 5.

Developmental Defects in Zebrafish Larvae at 120 hpf After Exposure to Nitrite or Nitrate for 24 hpf

	Treatment
	0 mg/L nitrite	1500 mg/L nitrite	1500 mg/L nitrate
Swim bladder noninflation (%)	0	50.0±25.3*	0
Pericardial/yolk sac edema (%)	2.8±2.8	3.0±1.5	0
Craniofacial malformations (%)	2.8±2.8	0	0
Axial malformations (%)	0	36.7±23.5*	0
Immobility (%)	0	0	0

Results are reported as Mean±SEM for 3 replicates and 25 eggs per replicate. Significant differences from control are shown by asterisks.

No defects were observed at 250, 500, 750, and 1000 mg/L nitrite.