Ecological Risk Assessment of Metal Pollution along Greater Cairo Sector of the River Nile, Egypt, Using Nile Tilapia, Oreochromis niloticus, as Bioindicator

Table 1

Body total length, body weight, condition factor, and scaled mass index of O. niloticus.

	Body total length (cm)					Body weight (g)
	Site 1 (G)	Site 2 (M)	Site 3 (I)	Site 4 (K)	Seasonal mean	Site 1 (G)	Site 2 (M)	Site 3 (I)	Site 4 (K)	Seasonal; mean
Winter	17.00 ± 0.71	13.33 ± 0.88^bB	18.30 ± 0.93^aB	14.23 ± 0.07^bB	15.72	116.54 ± 11.06^aA	49.88 ± 13.20^bB	132.88 ± 14.84^aB	63.57 ± 7.97^bB	90.72
Spring	13.60 ± 0.32^cC	13.53 ± 0.22^cB	18.80 ± 0.36^aAB	15.40 ± 0.40^bA	15.33	45.22 ± 4.05^cB	44.84 ± 0.56^cB	161.40 ± 7.51^aAB	75.56 ± 2.02^bA	81.76
Summer	20.33 ± 0.88^abA	16.30 ± 0.47^bcA	23.20 ± 2.58^aA	15.57 ± 0.23^cA	18.85	153.90 ± 22.83^aA	94.52 ± 6.08^bA	192.76 ± 22.06^aA	76.44 ± 4.21^bA	129.41
Autumn	13.30 ± 0.21^aC	14.60 ± 1.05^aAB	14.90 ± 0.31^aB	14.33 ± 0.17^aB	14.28	50.68 ± 2.85^aB	67.83 ± 17.25^aAB	71.98 ± 4.31^aC	59.53 ± 2.12^aB	62.51
Annual; mean	16.06	14.44	18.80	14.88	16.05^#	91.59	64.27	139.76	68.78	91.10^#
	Condition factor (CF); (%)					Scaled mass index (SMI); (g)
	Site 1 (G)	Site 2 (M)	Site 3 (I)	Site 4 (K)	Seasonal mean	Site 1 (G)	Site 2 (M)	Site 3 (I)	Site 4 (K)	Seasonal mean
Winter	2.37 ± 0.15^aA	2.01 ± 0.14^aAB	2.16 ± 0.08^aAB	2.20 ± 0.05^aA	2.19	116.26 ± 5.94^bA	47.74 ± 2.53^dA	131.90 ± 0.20^aAB	63.54 ± 1.27^cA	89.86
Spring	1.79 ± 0.06^cB	1.81 ± 0.07^bcB	2.43 ± 0.07^aA	2.08 ± 0.12^bA	2.01	76.22 ± 3.23^bC	42.54 ± 2.18^cA	151.73 ± 3.57^aA	45.96 ± 3.41^cBC	79.11
Summer	1.80 ± 0.06^aB	2.18 ± 0.07^aA	1.65 ± 0.31^aB	2.02 ± 0.04^aA	1.91	99.27 ± 5.21^aB	44.52 ± 2.25^bA	115.96 ± 4.29^aB	42.25 ± 2.22^bC	75.50
Autumn	2.15 ± 0.05^aA	2.09 ± 0.08^aAB	2.18 ± 0.06^aAB	2.02 ± 0.02^aA	2.11	90.38 ± 2.49^bBC	46.43 ± 2.09^dA	114.62 ± 3.10^aB	56.91 ± 2.49^cAB	77.09
Annual; mean	2.01	2.02	2.11	2.08	2.05^#	95.53	45.31	128.55	52.17	80.39^#

Data are represented as means of 16 samples ± SE.
Statistically significant differences () are shown with different superscript lowercase letters in the same raw and different superscript capital letters in the same column for each of the measured parameters.
Mean body total length value was used as for calculating the scaled mass index.
G, Giza; M, Manyal; I, Imbaba; and K, Kanater.
^#The mean of all measurements for each parameter.