Page 7 - IJA-Vol.3-No.2
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International Journal of Aquaculture 2013, Vol.3, No.2, 4
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Indiscriminate discharge of human wastes into the
river was noticed.
3.4
Station 3 (Ẹnu gada)
It is located some few meters after the bridge
connecting to Lafenwa. It is characterized by less
dense vegetation and slow flowing water. Activities
carried out here includes: washing of clothes, farming,
indiscriminate dumping of refuse and human excreta.
3.5
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.
3.6
Sample collection
Samples for phytoplankton analysis were collected by
the hand trawling method. This involves trawling
horizontally at the littoral zone (i.e. at the shore) with
55
µm mesh size plankton net. The net content of the
plankton net was put into a 120 ml plastic bottle. This
was preserved with 4% formalin solution within 5
minutes of sample collection. The sample was then
taken to the Laboratory for identification and
enumeration.. A drop of the sample was placed onto
the glass slide of the binocular microscope and was
covered with a cover slip for identification and
enumeration. Phytoplankton was identified at
magnifications of 10x, 40x and 100x using suitable
keys. Enumeration of phytoplankton was carried out
following the drop count method adapted from
Verlecar and Desai
(2004)
and was reported as units or
organisms per drop.
3.7
Statistical analysis
Descriptive Statistics in the form of tables and bar
charts were used in the presentation of the data. MS
EXCEL statistical package was used for the analysis.
Acknowledgement
All the members of staff especially Dr. (Mrs.) F.O.A. George of the
Department of Aquaculture and Fisheries Management, College of
Environmental Resources Management, Federal University of Agriculture,
Abeokuta, Ogun state, Nigeria are appreciated for their various contributions.
I also thank Mrs. Binyotubor of the National Institute of Freshwater Fisheries
Research for her technical support. May God be with you all.
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