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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 ± 0.03b 78.59 ± 0.12c 3.05a 4.56a y = 3.0507x – 3.6878 0.85a 0.92a
Lagos Lagoon O. nilotics 72 13.09 ± 0.03b 78.87 ± 0.10c 2.72b 4.26b y = 2.7189x – 2.8897 0.72b 0.85b
Asejire Reservoir C. nigrodigitatus 72 20.02 ± 0.05a 111.55 ± 0.14b 1.98c 1.64d y = 1.9848x – 1.3809 0.61c 0.78c
Lagos Lagoon C. nigrodigitatus 72 22.68 ± 0.03a 196.06 ± 0.16a 1.40c 2.43c y = 1.398x + 0.6536 0.58d 0.76c
Asejire Reservoir Male O. nilotics 34 13.10 ± 0.06c 95.38 ± 0.38bc 3.06a 2.52c y = 3.0648x -3.8209 0.80a 0.89a
Asejire Reservoir Female O. nilotics 38 13.15 ± 0.05c 62.32 ± 0.21c 2.23c 1.54d y = 2.2248x – 1.539 0.63c 0.79b
Lagos Lagoon Male O. nilotics 42 12.63 ± 0.05c 78.53 ± 0.19c 2.70b 4.75a y = 2.7036x – 2.7772 0.80b 0.92 a
Lagos Lagoon Female O. nilotics 30 13.67 ± 0.06c 79.29 ± 0.19c 2.99a 3.89b y = 2.9921x – 3.7117 0.64 c 0.80b
Asejire Reservoir Male C. nigrodigitatus 38 20.10 ± 0.09b 108.08 ± 0.26b 2.30c 1.54d y = 2.3046x – 2.3014 0.62 c 0.79bc
Asejire Reservoir Female C. nigrodigitatus 34 19.93 ± 0.11b 115.89 ± 0.33b 1.88d 1.75 cd y = 1.8757x – 0.9265 0.70b 0.83b
Lagos Lagoon Male C. nigrodigitatus 40 22.56 ± 0.05a 207.76 ± 0.29a 1.22d 3.26bc y = 1.2214x + 1.2741 0.57 c 0.76c
Lagos Lagoon Female C. nigrodigitatus 32 22.85 ± 0.07a 180.46 ± 0.36a 2.63b 1.43d y = 2.632x – 3.1997 0.61c 0.78c
  1. Means with the same superscripts along the column are not significantly different, (P > 0.05)