International Journal of Aquaculture, 2025, Vol.15, No.6, 275-286 http://www.aquapublisher.com/index.php/ija 280 significantly different (p > 0.05), whereas Bijimi (94.94 ± 57.49 g) and Idiogba (81.39 ± 49.23 g) differed significantly (p < 0.05). Mean length also varied, ranging from 16.82 ± 4.97 cm (Asumogha) to 19.19 ± 6.53 cm (Idiogba). These differences likely reflect environmental influences such as prey abundance, water salinity, and fishing activities in the coastal waters (Adesulu and Sydenham, 2021; Oladipo et al., 2023). Table 1 The mean length and weight values of E. fimbriata across the four stations Parameter Group Asumogha Ayetoro Bijimi Idiogba Weight (g) 0-50 27.25±2.09 27.59±9.73 28.39±3.46 34.53±4.35 51-100 71.56±3.63 76.52±4.46 69.70±6.77 76.27±1.44 101-150 134.20±2.12 132.35±12.17 114.73±10.08 121.46±11.6 151-200 0.00±0.00 164.50±0.00 0.00±0.00 184.90±13.29 Mean 66.36±41.49a 86.40±48.73b 62.18±34.30a 92.78±52.31c Length (cm) 0-50 13.40±1.08 11.88±5.22 12.49±1.20 14.25±1.62 51-100 19.10±0.98 19.56±0.83 17.92±1.10 19.28±1.09 101-150 24.98±0.16 25.32±0.94 22.78±3.92 23.41±0.37 151-200 0.00±0.00 28.50±0.00 0.00±0.00 27.50±3.54 Mean 18.00±4.64a 19.85±6.43b 16.72±4.40a 20.20±4.94b Note: Means in the same row and with homogenous superscript are not significantly different (p>0.05); All values are expressed as Mean ±SD Table 2 The mean length and weight values of C. macropogon across the four stations Parameter Group Asumogha Ayetoro Bijimi Idiogba Weight (g) 1-50 20.72±9.86 30.23±4.24 25.17±3.41 24.64±6.92 51-100 83.90±10.51 75.87±9.14 73.86±12.64 75.13±0.47 101-150 117.18±0.46 120.81±11.75 123.59±11.04 122.81±8.92 151-200 0.00±0.00 0.00±0.00 177.85±10.75 161.50±0.00 Mean 65.28±41.28a 71.53±38.42a 94.94±57.49c 81.39±49.23b Length (cm) 1-50 11.74±1.56 13.82±0.37 12.90±0.73 12.60±1.18 51-100 18.34±0.52 17.75±1.11 18.19±2.16 18.14±0.27 101-150 23.95±0.42 22.63±2.04 21.89±1.28 24.82±6.13 151-200 0.00±0.00 0.00±0.00 24.68±2.83 26.20±0.00 Mean 16.82±4.97a 17.65±3.82ab 19.07±4.77b 19.19±6.53b Note: Means in the same row and with homogenous superscript are not significantly different (p>0.05); All values are expressed as Mean±SD 3.2 Length-weight relationship The length–weight relationship (LWR) of Ethmalosa fimbriata showed clear spatial and temporal variation across the four sampling stations (Table 3). The growth exponent (b) ranged from 1.09 at Ayetoro in April 2015 to 2.68 at Idiogba in June 2015. At Ayetoro, values varied between 1.09 (April) and 1.96 (July), while Bijimi ranged from 1.63 (May) to 2.63 (June). Idiogba recorded the widest spread, with 1.57 in May and a peak of 2.68 in June. In Asumogha, the b values ranged from 1.94 (June) to 2.58 (April). For Chrysichthys macropogon (Table 4), the b values also fluctuated considerably. Idiogba showed the lowest (1.56 in April) while Bijimi recorded the highest (3.18 in April). Ayetoro ranged between 1.82 (June) and 2.92 (July), whereas Asumogha varied from 1.64 (May) to 2.65 (July). In both species, b values consistently deviated from the isometric standard of 3, indicating allometric growth—where body weight does not increase proportionally with length. Condition factor (K) values provided further insights into fish health. For E. fimbriata, K ranged from 0.92 at Ayetoro (June) to 1.56 at Ayetoro (April). Idiogba values varied from 1.07 (April) to 1.31 (July), while Asumogha ranged between 0.97 (April) and 1.51 (May).
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