Preliminary Study on Physico-chemistry and Comparative Morphometric Characterisation of Cynothrissa mento (Regan, 1917) from Ologe, Badagry and Epe Lagoons, Lagos, Nigeria
International Journal of Agricultural Research,
2011, 6(10), 736-746.
Racial characterisation of fish species is important for taxonomic classification. The physico-chemical parameters of Ologe, Badagry and Epe Lagoons, Lagos, Nigeria were investigated and the morphometric characters of Cynothrissa mento from the three lagoons were compared to assess the possibility of this fish species from the three lagoons belonging to the same sub-population. The study was conducted between May, 2009 and April, 2010 and monthly sampling of fish and water was done in each sampling site. 9 physico-chemical parameters and 7 morphometric characters were assessed. A total of 386 specimens (Ologe 106, Badagry 174 and Epe 106) of C. mento were collected from the landings of the local fisher folks from the sampling sites. There was no significant difference (p>0.05) in all the physico-chemical parameters measured among the sampling sites except Biochemical Oxygen Demand (BOD). Coefficient of difference revealed that the C. mento from the three lagoons are uniform in all the morphometric parameters examined which means that the specimens from the three sampling sites belong to the same sub-population. Three morphometric characters (body depth, head length and head depth) with high correlations demonstrated isometric growth, that is, they were best described by simple linear regressions.
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