Diversity and abundance of Synodontis (Cuvier, 1816) species in the lower river Benue, Makurdi, Benue state, Nigeria

Publication Type:Journal Article
Year of Publication:2016
Authors:P. M. Akombo, Akange, E. T. , Adeyemi, S. O.
Journal:International Journal of Fisheries and Aquatic Studies
Start Page:238
Date Published:03-2016
Keywords:abundance, diversity, River Benue, Synodontis species

The diversity and abundance of the Synodontis species in River Benue at Makurdi were studied over a 24 month period, from January 2009 to December 2010. A total of 1104 specimens, comprising 16 species were identified. The 16 species were: S.schall, 635 (57.52%); S.gambiensis,109 (9.87%); S.membranaceus,106 (9.60%); S.clarias, 93 (8.42%); S.omias, 51 (4.62%); S.melanopterus, 28 (2.54%); S.budgetti, 19 (1.72%); S.sorex, 12 (1.09%); S.nigrita, 11(1.00%); S.courteti, 9(0.82%); S.violaceus, 9(0.82%); S.resupinatus, 8(0.72%); S.filamentosus, 6(0.54%); S.batensoda, 3(0.27%); S.ocellifer, 3(0.27%) and S.vermiculatus, 2(0.18%). Out of the 1104 specimens, 594 (54.80%) were males, while 510 (46.20%) were females, with the male to female sex ratio of 1.2:1. The diversity indices also showed that S. schall had the highest diversity (Shannon Weiner H 6.40; Simpson 1-D 1.00; Brillouin 6.20 and Margalef 71.30). The least was recorded from S.vermiculatus (Shannon Weiner H 0.69; Simpson 1-D 0.52; Brillouin 0.60 and Margalef 209.23).

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