Table 1.

Toxicity of cypermethrin against fingerlings of fish Labeo rohita.

Exposure periods	Effective dose (LC values, μg/L)	Limits (μg/L)		Slope value	“g” factor	“t” ratio	Heterogeneity
		LCL	UCL
6 h	(i) LC10 = 0.203	0.173	0.225	6.33 ± 0.77	0.056	8.27	0.34
	(ii) LC50 = 0.323	0.302	0.347
	(iii) LC90 = 0.515	0.461	0.610
12 h	(i) LC10 = 0.189	0.166	0.207	7.64 ± 0.80	0.042	9.52	0.32
	(ii) LC50 = 0.278	0.261	0.295
	(iii) LC90 = 0.409	0.378	0.457
18 h	(i) LC10 = 0.172	0.152	0.187	8.92 ± 0.94	0.043	9.46	0.29
	(ii) LC50 = 0.240	0.225	0.254
	(iii) LC90 = 0.334	0.311	0.367
24 h	(i) LC10 = 0.154	0.136	0.168	8.41 ± 0.29	0.059	8.05	0.13
	(ii) LC50 = 0.205	0.193	0.217
	(iii) LC90 = 0.273	0.254	0.301

There was no mortality in control groups.

Batches of ten fishes were exposed to different concentrations of cypermethrin.

Concentrations given are the final concentrations (w/v) in aquarium water.

Regression coefficient showed that there was significant (P < 0.05) negative correlation between exposure periods and different LC values.

LCL: lower confidence limit; UCL: upper confidence limit.