International Journal of Aquaculture 2013, Vol.3, No.2, 4
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http://ija.sophiapublisher.com
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Table 2 Abundance of phytoplankton in River Ogun (December 2011 – June 2012)
Phytoplankton groups
Genus/Species
Genus/Species Abundance
Phytoplankton group abundance
Percentage (%)
Chrysophyta
Pinnularia
Nitzchia
Navicula
Ophiocytium
Eunotia
Cyclotella
Oscillatoria
Synedra
Tabellaria
Chlorogibba
Monallantus
Gloeochloris
Gomphonema
Fragillaria
Diatoma
4
43
22
9
4
10
14
8
10
3
2
4
2
12
1
148
31.4
Chlorophyta
Gonatoxygon
Ankistrodesmus
Closterium
Ulothrix
Spirotaenia
Penium
Pleurotaenium
Protococcus
Spirogyra
Zygnema
Mougeotia
Netrium
Tetraspora
Closteriopsis
4
29
19
1
9
9
2
9
4
11
1
1
6
6
111
23.6
Cyanophyta
Phormidium
Spirulina
Anabaena
Aphanocapsa
Merismopedia
Coelosphaerium
Polycystis
10
7
17
45
17
55
42
193
41.0
Euglenophyta
Phacus
Euglena
Menoidium
5
6
1
12
2.5
Pyrrophyta
Peridinium
Chilomonas
5
2
7
1.5
Total
471
471
100.0
3.2
Station 1 (Ibẹrẹkodo)
It is located just downwards the Ogun State Water
Works Corporation at Arakanga. 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 activities here are majorly
fishing, bathing, dam maintenance and fishing gear
mending. No farmland was observed at this station.
3.3
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
activities of the ferry men could lead to siltation of the
water body causing high turbidity conditions.