Table 1. Sex ratio analysis and chi-square significance of three Mystus species studied from the upper Brahmaputra basin, Northeast India

Species	Males(M)	Female(F)	Combine sex(M + F)	Sex ratio	χ²	p-value
Mystus cavasius	201	141	342	1:0.70	10.52	0.00*
Mystus vittatus	91	244	335	1:2.68	69.52	0.00*
Mystus tengara	70	138	208	1:1.97	61.94	0.00*

Significant (p < 0.05).