International Journal of Aquaculture, 2013, Vol.3, No.15, 79
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potential evapotranspiration have been put between
1 600
and 1 900 mm (Bhattacharya and Bolaji, 2010).
The water is used for agriculture, transportation,
human consumption, various industrial activities and
domestic purposes. Along its course, it constantly
receives effluents from breweries, slaughterhouses,
dyeing industries, tanneries and domestic wastewater
before finally discharging to Lagos lagoon (Ayoade et
al
.
, 2004;
Oketola et al., 2006). A 100 square km area
around River Ogun has an approximate population of
3 637 013 (0.03637
persons per square meter) and an
average elevation of 336 meters above the sea (Travel
Journals, 2012).
3.3
Collection of Water Samples
Four sampling stations were established along the
length of the river. Their description based on personal
visual observations is given below:
3.3.1
Station 1 (Ibẹrẹkodo)
It is located just downwards the Ogun State Water
Works Corporation at Arakanga in Iberekodo. The
water is cured by the corporation and dispensed
through underground pipes to respective homes. The
river here is characterized by a dam/spillway and high
concrete dykes. The water is generally very clear and
has good aesthetic quality. The water is turbid in the
rainy months and clear in the dry months. The
activities here are majorly fishing, bathing, dam
maintenance and fishing gear mending. No farmland
was observed at this station.
3.3.2
Station 2 (Agọ ika)
It is located close to the FADAMA III supported ferry
for transportation to Lafenwa. The vegetation around
the banks is very dense. The activities here includes:
locust bean processing, bathing, washing of clothes,
refuse dumping and transportation by ferry. The water
is turbid in the rainy months and clear in the dry
months. The activities of the ferry men could lead to
siltation of the water body causing high turbidity
conditions. No farmland was observed at this station.
3.3.3
Station 3 (Ẹnu gada)
It is located some few steps after the bridge connecting to
Lafenwa. It is characterized by less dense vegetation
and slow flowing water. The water is turbid in the
rainy months and clear in the dry months. Activities
carried out here includes: washing of clothes, farming;
indiscriminate dumping of refuse and human excreta.
3.3.4
Station 4 (Off Pepsi bus stop)
It is characterized by rocky outcrops with fast flowing
water. The vegetation consists of terrestrial vegetation
which is less dense. The water is clear and has good
aesthetic quality. Activities carried out here includes:
bathing, washing of clothes and drying of fishing gear
on the rocks. No farmland was observed at this station.
3.4
Experimentation
Water samples for physico-chemical analyses were
collected monthly for seven consecutive months
(
December 2011 – June 2012) at the four sampling
stations. pH, air temperature (
℃
),
water temperature
(
℃
),
conductivity (µs/cm) and total dissolved solids
(
mg/L) were conducted
in-situ
with the use of
HANNA Combo pH and EC multi meter Hi 98129
and Mercury-in-glass thermometer while Dissolved
Oxygen (mg/L), Nitrate (mg/L), Phosphate (mg/L),
Alkalinity (mg/L) and Hardness (mg/l) were
determined
ex-situ
using standard methods for
examination of water.
3.5
Statistical analysis
The data was subjected to One way Anova Analysis
using SPSS for the various parameters. Further test
such as Duncan’s multiple range tests was carried out
to ascertain whether there is significant difference
among the parameters.
Acknowledgement
I appreciate Dr. (Mrs.) F.O.A. George (Head of Department, Department of
Aquaculture and Fisheries Management, Federal University of Agriculture,
Abeokuta, Ogun state, Nigeria) for her motherly support and advice while
carrying out this project. I thank my project supervisor Dr. D.O. Odulate for
the technical support as regards dissolved oxygen analysis he gave this
project. I appreciate and thank Dr. W.O. Alegbeleye of the same department
for the textbooks he provided me with. I appreciate Mrs. Binyotubor of the
National Institute for Freshwater Fisheries Research (NIFFR), New Bussa,
Niger state for the support she gave. I last but not the least appreciate my
immediate family especially my mother Mrs. J.O. Dimowo for the moral
and financial support she gave me while carrying out this project. May God
uplift and be with you all. Amen
Reference
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bacteriological analysis of surface water in Ewekoro Local
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Alberta Water Quality Awareness (AWQA), 2012, Dissolved Oxygen and
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Geographer, 12(1-2): 95-104
Ayoade A. A., Sowunmi A. A., Nwachukwu H. I., 2004, Gill asymmetry in
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Bhattacharya A. K., Bolaji G. A., 2010, Fluid flow interactions in Ogun