The ecological impact of tidal pond channelization on the distribution of tilapia species (Perciformes: Cichlidae) on Buguma creek, Rivers State, Nigeri
Journal Title: Aquaculture, Aquarium, Conservation & Legislation - International Journal of the Bioflux Society - Year 2011, Vol 4, Issue 5
Abstract
A study of the tilapia species (Perciformes: Cichlidae) of a tidal creek in the Southeast of the Niger Delta, Nigeria was conducted to assess the ecological impact of tidal pond channelization. There was no significant difference (p>0.05) in the values of the physical and chemical parameters, except for transparency, water level and salinity (p<0.01). Orthogonal comparison using Duncan’s Multiple Range test showed that station 2 (the tidal pond channel) was the cause of the observed difference in transparency and water level. Two tilapia species comprising Sarotherodon melanotheron and Tilapia guineensis were recorded during the studies, with S. melanotheron being the dominant species. Orthogonal comparison using Duncan’s Multiple Range test showed that S. melanotheron was the cause of the observed difference in the tilapia population. Although there was positive correlation between salinity and the tilapia species at all stations, there was no significant correlation between tilapia species and the environmental variables. The findings of this study showed that channelized water bodies have lower qualify fish assemblage when compared to natural water bodies due to a loss of heterogeneous habitat. Although channelization is inevitable in the development of brackishwater fish ponds, amelioration measures of its adverse effects deserve high priority. However since no significant difference (p>0.05) existed in the distribution of T. guineensis, this study indicated that not all species are impacted by tidal pond channelization.
Authors and Affiliations
Blessing Oribhabor, Justin Opara, Ebinimi Ansa
Keywords
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