Fish Productivity Response to Water Quality Variations: A Case Study of Nyumba ya Mungu Dam, in Pangani Water Basin, Tanzania

Table 2

Multiple linear regression coefficients, prediction of monthly fish catch per unit effort relation to turbidity level, dissolved oxygen (DO) concentrations, and depth of the fishing net location.

Model				Unstandardized coefficients		Standardized coefficients	t	Sig.	Collinearity statistics
				B	Std. Error	Beta			Tolerance	VIF
1	(Constant)			5234.877	441.594		11.855	0.000
	Turbid			40.448	8.033	0.461	5.036	0.000	1.000	1.000
2	(Constant)			7412.254	1,024.013		7.238	0.000
	Turbid			37.201	7.968	0.424	4.669	0.000	0.970	1.031
	DO			−400.022	170.620	−0.213	−2.345	0.021	0.970	1.031
3	(Constant)			9729.800	1,516.765		6.415	0.000
	Turbid			31.935	8.249	0.364	3.872	0.000	0.875	1.143
	DO			−363.290	168.740	−0.193	−2.153	0.034	0.959	1.043
	Depth			−355.298	173.894	−0.191	−2.043	0.044	0.880	1.136
	R			R ^2	R ^2 residual	F	value	Durbin–Watson
1		0.461^a	0.212		0.204	25.357	0.000^b
2		0.506^b	0.256		0.240	16.033	0.000^c
3		0.537^c	0.289		0.265	12.445	0.000^d	1.257

a, significant at 0.05; b, significant at 0.05; c, significant at 0.05; d, significant at 0.05.