Department of Zoology

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Department of Zoology

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Browsing Department of Zoology by Author "ADEDEJI, A.A"

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    Assessment of the water quality parameters in relation to fish community of Osinmo reservoir, Ejigbo, Osun State, Nigeria
    (Research Gate, 2014-04) KOMOLAFE, O.O; ADEDEJI, A.A; FADAIRO, B
    Physicochemical indices of water body changed seasonally and this necessitated an investigation to assess the water quality parameters of Osinmo reservoir in relation to its fish species. The water quality parameters were measured using standard methods. Results obtained show that the reservoir is alkaline in nature with dissolved oxygen concentration (1.8-7.2 mgl-1) and alkalinity (64 CaCO3 mgl-1-108 CaCO3 mgl-1) which were within the optimum range for growth and survival of fish. Four families of fish comprising eight species were encountered. The sex-ratio of five species which were statistically different (P<0.05) indicated reproductive efficiency populations while other fish species whose sex-ratio differed insignificantly (P>0.05) revealed a growing population. The well-being of the fish species was adequate as observed in the least mean condition factor of 0.666±0.057 in C. gariepinus and the highest mean of 2.000±0.242 in S. galilaeus. The productivity of the reservoir can be improved through proper management of the water body
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    EFFECTS OF POND FERTILIZATION ON THE PHYSICO-CHEMICALWATER QUALITYOFSELECTED EARTHEN FISHPONDS IN IFE NORTH LOCAL GOVERNMENTAREA, OSUN STATE, NIGERIA
    (Zoological Society of Nigeria, 2013-04-09) ADEDEJI, A.A; ADENIYI, I.F
    The effect of fertilization on the physico-chemical water quality of six selected earthen fishponds in Ife North Local Government Area of Osun State was investigated for a period of two years sampling the ponds every other month. The fishponds were grouped with regard to fertilization practice and water flowage regime into three sets comprising two non- flow-through ponds that received organic and inorganic fertilizers (FNF); two flow-through ponds that received the same organic and inorganic fertilizers (FF) and two unfertilized flow-through ponds. The investigated water quality parameters include water temperature, pH, transparency, dissolved oxygen, major ions, some plant nutrients and heavy metals using standard titrimetric and instrumental methods of analysis.The mean values of these parameters were not statistically different (p> 0.05) for the three sets of fishponds with the exception of sodium, Alkalinity, HCO3-, Conductivity and TDS which were each characterized with significant mean differences (p= 0.05). In general, the fertilized ponds were characterized by higher mean values in 24 of the 29 investigated water quality parameters than the non-fertilized ponds. Also the mean values of 22 out of the 29 investigated parameters were generally higher in the flow-through ponds than in the non-flow- through ponds. Increase in the parameters due to water flowage was statistically significant (p> 0.05) for sodium, alkalinity, bicarbonate, conductivity and TDS while the effect of fertilization was higher for the dissolved oxygen parameters, nutrients (NO3, PO4,), major ions and apparent colour. Thus, the fertilized ponds were more saline (based on conductivity and TDS), better buffered and richer in nutrient than the unfertilized ponds. These effects were enhanced by flowage hence the fertilized flow-through ponds were characterised by the most suitable water quality for fish culture in the study-area while the fertilized non flow-through ponds was least suitable. The study revealed that to achieve the desired effect, pond fertilization must be accompanied by adequate water flowage especially in shallow fishponds
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    Zooplankton abundance and diversity of fishponds exposed to different management practices
    (International Journal of Biological and Chemical Sciences, 2013-04) ADEDEJI, A.A; ADENIYI, I.F; MASUNDIRE, H
    The taxonomic composition and community structure of zooplankton faunae of selected earthen fishponds in Ife North Local Government Area of Osun State, Nigeria were investigated for a period of two years sampling every other month. The study was based on three sets of fishponds with regards to fertilization practice and water flow regime. These include non flow-through ponds that received organic and inorganic fertilizers (FNF); flow-through ponds that received organic and inorganic fertilizers (FF) and unfertilized flow- through ponds. The zooplankton fauna of the fishponds comprised of 81 species belonging to three phyla namely Rotifera (62 species belonging to 16 families and two orders), Arthropoda (6 cladocerans, 2 copepods, 6 ostracods, 4 insecta and one arachnid species) and Protozoa which was represented by only one species. Zooplankton species richness indices were generally higher in the flow-through ponds than in the non flow through ponds with some species occurring only in the fertilized flow-through ponds. The flow-through pond had the highest number of species 54, while the least number of species 37 was recorded from the non flow- through pond. The fertilized non-flow-through ponds also had the .highest mean abundance of 36762 ± 56162 ind/m 3 , followed by fertilized flow-through ponds (34346 ± 40784 ind/m 3 ) and non-fertilized flow-through ponds (16006 ± 41263 ind/m 3 ) descending order. The means in zooplankton abundance among the ponds were, however, not statistically significant. The fertilized ponds supported zooplankton abundance while continuous water flow as observed in the flow-through had direct influence on diversity and species richness. Hence to achieve the desired effect of pond fertilization on its primary productivity, this must be accompanied by adequate water flowage especially in shallow fish ponds