Browsing by Author "Auta, J.,"

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    PHYSICO-CHEMICAL CHARACTERISTICS OF DOMA RESERVOIR, NASARAWA STATE, NIGERIA
    (Department of Zoology, Faculty Of Natural And Applied Sciences, Nasarawa State University, Keffi, 2016-03-05) Banyigyi, A.H.; Auta, J.,; Oniye, S.J.,; Balogun, J.K.
    Some physico-chemical parameters of water in Doma reservoir, Nasarawa State, Nigeria was determined from July, 2012 to June, 2014 from three sampling stations. The physico-chemical parameters of water were determined using La Motte Tracer (pocketester) code: 1766 and La Motte Fresh Water Aquaculture Test Kit (model: AQ-2) code: 3633-03. (State the methods used before the results) The physico-chemical parameters of the water and their respective mean range were; water temperature 27.98-28.24°C, transparency 63.3563.62 cm, pH 7.03-7.05, TDS 26.25-27.08 ppm. electrical conductivity 43.75-45.09 pS~‘, water hardness 18.33-19.16 ppm, while dissolve oxygen (DO) was 6.52-6.79ppm. There were no significant difference (P<0.05) in the values for physico-chemical parameters for the sampling stations, but there were seasonal variation (P<0.05) in the physicochemical parameters of the reservoir. The mean dry season values for water temperature, transparency, salinity, total dissolved substances, conductivity, hardness and dissolved oxygen were significantly higher (P<0.05) than these of the rainy season while the mean rainy season values for depth, ammonia nitrogen, alkalinity? carbon dioxide and chloride were higher than those of dry season. The physicochemical parameters of Doma reservoir is within acceptable range that supports aquatic life, particularly fish.
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    Study on Fish Diversity of Doma Reservoir, Nasarawa State, Nigeria
    (Department of Zoology, Faculty Of Natural And Applied Sciences, Nasarawa State University, Keffi, 2016-12-07) Banyigyi, A.H.; Auta, J.,; Oniye, S.J.,; Balogun, J.K.,; Umaru, J.
    Study on fish diversity of Doma Reservoir, Nasarawa State, Nigeria was carried out at three ’ sampling stations (Kwararafa, Main Dam and Yelwa). A fleet of gill nets of mesh sizes 38.1mm (1.5”), 57.15mm (2.25”), 76.2mm (3.0”), 101.6mm (4.0”), 127.0mm (5.0”), 152.4mm (6.0”) and 177.8mm (7.0”) were used to sample the shore, surface and bottom : water habitats. The sampling period was 24 months covering two (2) wet and two (2) dry ■ seasons (July 2012 to June 2014). The fish samples caught were identified to the species level and morphometric parameters were recorded following standard methods. fish samples belonging to 6 families with 11 species were identified throughout the study period. The family Cichlidae has the highest number of individuals (93.9%) followed Mormyridae (4.0%). The dry season recorded the highest nuniber of fish (1543) representing ' 56.79% than the wet season (1174) representing 43.21%. Spatially, Yelwa station recordedthe highest number individual (1021) representing 37.58%, followed by Kwararafa (950) -■ representing 34.97) and the least recorded in the Main Dam 746 representing 27.46%. Diversity indices show that Simpson’s index of diversity (1-D) range from 0.403 to 0.479,' Shannon’s index (H) range from 0.858 to 1.0007, while the Shannon equitability or evenness (Eh) range from 0.391 to 0.437 .