Browsing by Author "Idowu, R.T."

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    DISTRIBUTION AND ABUNDANCE OF SOME ZOOPLANKTON SPECIES IN NASARAWA STATE UNIVERSITY STREAMS, KEFFI, NIGERIA
    (Department of Zoology, Nasarawa State, University Keffi, 2021-07-06) Asarya, A.; Makpo, James Kpuk; Banyigyi, A.H.; Idowu, R.T.
    The study on Zoological Garden and Cross-three streams in Nasarawa State University Keffi, Nigeria focused on the distribution and abundance of some zooplankton species. Zooplanktons were sampled with improvised fabricated 30cm diameter cylindrical scooper net with attached mesh size of 96pm from the surface of the stream due to the shallowness of the sampling sites and less water volume. There were three major phyla with 12 species of zooplankton found in the two university streams which include Arthropoda, Cilliophora and Rotifera. The phylum Arthropoda has the highest relative abundance with ten (10) species which include; Gammarus fasciatus, Gnathophausia zoea, Cala nus cyclops, Cyclops serrulatus, Harpacticella jejuensis, Corycaeus affinis, Eresia nauplis, Calais parreysii, the order Cladocera of phylum Arthropoda has two species Moinabra chiata and Daphnia pulex while the phylum Cilliophora and Rotifera have one (1) species Euchlanis contorta and Vorticella convallaria respectively. The Station variation of zooplankton distribution was observed to be higher in station I of Zoological Garden stream with 290 (36.9%) followed by station III of Cross-three stream with 289 (29.1%) while stations II and IV recorded 242 and 228 representing 18.5% and 15.5% respectively. The seasonal distribution was high in the raining season with total of 563 representing 52.7% while dry season distribution recorded 468 representing 47.3%. The distribution and abundance of zooplankton of the two university streams (Zoological Garden and Cross-three) shows some relationship between the zooplanktons and the seasons. Higher number recorded during the raining season may be attributed to the volume of the water in the two streams. The finding of this study is therefore helpful to the communities around the streams as the water is relatively safe for domestic use and aquatic life, environmental auditing which involves self-regulation should be encouraged as an overall environmental management policy.
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    The Diversity of Fish Species, Composition and Abundance from Bodna River In Kwall Area Council, Abuja.
    (Department of Zoology, Faculty Of Natural And Applied Sciences, Nasarawa State University, Keffi, 2019-03-02) Sani, B.M.,; Idowu, R.T.; Banyigyi, A.H.
    The Diversity of fish species, composition and abundance from Bodna River in Kwali Area Council, Abuja was studied between May 2018 to April 2019.The aim of the study was to determine the management and sustainable use of the fisheries resources of the Area council. About 1331 fish were collected from the artisanal fishermen during the study period and morphometric indices were determined using standard methods. The fish were identified and counted. Sex ratio 1:2:1 (Males to Females) was obtained indicating a male dominated population. Length -weight measurement indicated that the fish exhibited positive allometric growth pattern. The highest percentage abundant species in the site were Oreochromis niloticus with 34.8% Clarias garienpinus with 28.0% and Pellonula leonerisis with 17.6% and the least occurring species were Ncmnocharax shariensis with 11.0% Mormyrus valenciensis with 7.7%. The seasonal variation of fish distribution was observed to be higher in the wet season with 66.2% than the dry season. Nutrient displayed greater impact on fish abundance in the wet season. The Simpson and Shannon Weiner’s diversity index values were (0.976) and (-1.456) in both richness and evenness respectively. The findings of the study could be helpful to the artisanal fishermen and the community for fisheries sustainability.