Morphometric and Meristic features and Length-Weight Relationship as indicators of quality of Brycinus macrolepidotus in Lower River Ogun, Nigeria

ADEOSUN, F.I and IDOWU, A.A and OGHENOCUHOKO, O.M. and ADEBOWALE, A.Q. and ADEKOYA, O.M (2019) Morphometric and Meristic features and Length-Weight Relationship as indicators of quality of Brycinus macrolepidotus in Lower River Ogun, Nigeria. Egyptian Journal of Aquatic Biology & Fisheries, 23 (2). pp. 433-441. ISSN 1110 – 6131

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Abstract

One Hundred And Eighty samples of True big-scale fish (Brycinus macrolepidotus Valenciennes, 1850) were collected bi-monthly from June – November, 2017, from River Ogun, Nigeria. Total length and body weight of all samples measured and samples were grouped based on length into sizes: juveniles (10-14.9 cm), sub-adults (15.1-19.9 cm), and adults (20.2-26.3 cm). Significant differences (p<0.05) were observed in the meristic characters in all the groups. Dorsal fin ray ranged from 7-9, pelvic fin ray 8-12, caudal fin ray 18-24, pectoral fin ray 7-12, anal ray 12-14 and dorsal spine 0-9 through the wet and dry season for all sizes. Length- Weight relationship for juveniles, sub-adult and adult sizes showed ‘a’, ‘b’ and ‘r’ values for juveniles as -0.82, 2.17 and 0.85, sub-adult as -0.38, 1.82 and 0.90 and adult as 0.44, 1.03 and 0.78 respectively. Mean condition factor recorded was 1.16±0.15, 1.39±0.13, and 2.17±0.59 for adult, sub-adult and juvenile respectively. Conclusively, B. macrolepidotus in this aquatic ecosystem could be in a good environment and quality as condition factor of all sizes were above 1.

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