Table 2.

Mean lethal concentrations (50%) (LC ₅₀ ) of commercial disperse red 1 in newborn and adult G. tigrina tests

	LC 50 (mg/L)
Test	Newborn				Adult
	24 h	48 h	72 h	96 h	24 h	48 h	72 h	96 h
I	127	127	74	67	*	201	179	159
II	120	91	79	79	*	207	156	148
III	131	111	87	80	*	198	162	150
Mean	126	110	80	75		202	167	152
SDa	5.6	18	6.5	7.2		4.6	12	5.8
CV (%)b	4.4	16.4	8.1	9.6		2.2	7.2	3.8

Asterisk indicates no mortality was observed. ^aSD standard deviation of the mean. ^bCoefficient of variation. The tests indicate as I, II, and III correspond to independent assays.