Are Fish and Standardized FETAX Assays Protective Enough for Amphibians? A Case Study on Xenopus laevis Larvae Assay with Biologically Active Substances Present in Livestock Wastes

Table 3

96 h lethal concentration in the 50% of the cases (LC₅₀, mg/L) for early-life-stage amphibians and fish exposed to copper (Cu), zinc (Zn), selenium (Se) and manganese (Mn). (Source: [18]).

Species	LC50
	Cu	Zn	Se	Mn
Rana catesbeiana	0.02	0.08	0.07
Gastrophryne carolinensis	0.02	0.01	0.09	1.42
Rana palustris	0.02	0.08	0.07
Rana pipiens	0.05	0.05	0.14	318
Pseudacris crucifer	0.05
Ambystoma barbouri	0.25	0.56
Ambystoma jeffersonianum	0.37	1.00
Ambystoma texanum	0.38	1.08
Ambystoma maculatum	0.48	1.15
Ambystoma tigrinum	0.50	2.00
Ambystoma opacum	1.63	2.31
Bufo fowleri	27.0	87.0		19.80
Oncorhynchus mykiss	0.09	1.06	5.17	2.91
Micropterus salmoides	6.68	5.18	114	25.60
Carassius auratus	5.20	2.52	8.91	10.40
Ictalurus punctatus	6.62	0.24	0.24