Bioaccumulation of heavy metals in silver catfish (Chrysichthys nigrodigitatus) and tilapia fish (Oreochromis niloticus) from the brackish and freshwater in South-West, Nigeria

Abidemi-Iromini, Atilola O.; Bello-Olusoji, Oluayo. A.; Adebayo, Isaac A.

doi:10.1186/s41936-022-00272-z

The Journal of Basic and Applied Zoology

Table 1 Sex frequency and length–weight indices on O. niloticus and C. nigrodigitatus from Asejire Reservoir and Lagos Lagoon

From: Bioaccumulation of heavy metals in silver catfish (Chrysichthys nigrodigitatus) and tilapia fish (Oreochromis niloticus) from the brackish and freshwater in South-West, Nigeria

Locations	Fish spp.	Frequency	Mean standard length (cm) ± Standard deviation	Mean weight (g) ± Standard deviation	Coefficient (b-value)	Condition factor (K-factor)	Regression equation	Regression (R²)	Regression (r-value)
Asejire Reservoir	O. nilotics	72	12.52 ± 0.03^b	78.59 ± 0.12^c	3.05^a	4.56^a	y = 3.0507x – 3.6878	0.85^a	0.92^a
Lagos Lagoon	O. nilotics	72	13.09 ± 0.03^b	78.87 ± 0.10^c	2.72^b	4.26^b	y = 2.7189x – 2.8897	0.72^b	0.85^b
Asejire Reservoir	C. nigrodigitatus	72	20.02 ± 0.05^a	111.55 ± 0.14^b	1.98^c	1.64^d	y = 1.9848x – 1.3809	0.61^c	0.78^c
Lagos Lagoon	C. nigrodigitatus	72	22.68 ± 0.03^a	196.06 ± 0.16^a	1.40^c	2.43^c	y = 1.398x + 0.6536	0.58^d	0.76^c
Asejire Reservoir Male	O. nilotics	34	13.10 ± 0.06^c	95.38 ± 0.38b^c	3.06^a	2.52^c	y = 3.0648x -3.8209	0.80^a	0.89^a
Asejire Reservoir Female	O. nilotics	38	13.15 ± 0.05^c	62.32 ± 0.21^c	2.23^c	1.54^d	y = 2.2248x – 1.539	0.63^c	0.79^b
Lagos Lagoon Male	O. nilotics	42	12.63 ± 0.05^c	78.53 ± 0.19^c	2.70^b	4.75^a	y = 2.7036x – 2.7772	0.80^b	0.92 ^a
Lagos Lagoon Female	O. nilotics	30	13.67 ± 0.06^c	79.29 ± 0.19^c	2.99^a	3.89^b	y = 2.9921x – 3.7117	0.64 ^c	0.80^b
Asejire Reservoir Male	C. nigrodigitatus	38	20.10 ± 0.09^b	108.08 ± 0.26^b	2.30^c	1.54^d	y = 2.3046x – 2.3014	0.62 ^c	0.79^bc
Asejire Reservoir Female	C. nigrodigitatus	34	19.93 ± 0.11^b	115.89 ± 0.33^b	1.88^d	1.75^cd	y = 1.8757x – 0.9265	0.70^b	0.83^b
Lagos Lagoon Male	C. nigrodigitatus	40	22.56 ± 0.05^a	207.76 ± 0.29^a	1.22^d	3.26^bc	y = 1.2214x + 1.2741	0.57 ^c	0.76^c
Lagos Lagoon Female	C. nigrodigitatus	32	22.85 ± 0.07^a	180.46 ± 0.36^a	2.63^b	1.43^d	y = 2.632x – 3.1997	0.61^c	0.78^c

Means with the same superscripts along the column are not significantly different, (P > 0.05)

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