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Articles by P.U. Uzukwu
Total Records ( 3 ) for P.U. Uzukwu
  D.O. Bekibele , E.J. Ansa , O.E. Agokei , J.Y. Opara , V.C. Alozie-Chidi , A.A. Aranyo , P.U. Uzukwu , A.J. Gbulubo , A. Okereke , N. Azubuike , N. Ezenwa and I. Ibemere
  Protein is the most important nutrient in fish diet. The protein in the ingredients must not only be chemically available but it must also be biologically available for the fish to utilize it. An experiment was carried out to find out the comparative effect of imported fish meal, blood meal and local fish waste based diets on the growth and survival of juvenile tilapia (O. niloticus) in concrete tank. Four diets consisting of Nigerian Institute for Oceanography and Marine Research (NIOMR) pelleted feed (40% CP) (treatment 1 and control), fresh boiled cattle blood (30% CP) (treatment 2), fresh cattle blood (30% CP) (treatment 3) and local fish waste meal (30% CP) (treatment 4) were fed to juvenile tilapia. The average initial weight of the fish was 55.24 g. The experiment was a completely randomized design in four replicates. There was no significant difference (p<0.05) in the body weight gain, average daily weight gain and average body length between the treatments. However, the relative weight gain of treatments 1 (93.69%) and 2 (80.21%) were significantly higher (p<0.05) than treatments 3 (62.37%) and 4 (64.85%). The survival was 100% in all treatments. Treatment 2 was more cost effective at 539.06 kg-1 fish, followed by 1 with 667.52. Treatments 3 and 4 had the highest at 698.20 and 718.60 kg-1 fish. The trial showed that tilapia feed processed with fresh cattle blood performed as well as imported fish meal, boiled blood and local fish waste and in addition was more cost effective.
  P.U. Uzukwu , A.A. Aranyo and C.O. Uzukwu
  In recent times, there has been an upsurge in the culture of tilapia in Nigeria resulting in increased demand for the fingerlings which is hardly satisfied. This is due to increasing demand for table size tilapia as food fish and under-sized tilapia in the fish meal and fish canning industries in Nigeria. Collection of Tilapia guineensis fingerlings from the wild, to augment hatchery production has been the practice and this is subject to environmental fluctuations. Multivariate regression and correlation analyses of accumulated data were used to investigate the effects of changes in water quality parameters on abundance of fingerlings of Tilapia guineensis in a brackish water habitat in Lagos. Dissolved Oxygen (DO), salinity and Secchi transparency were found to be the most dominant factors affecting the abundance of Tilapia guineensis fingerlings in the Lagos lagoon. Peak period of abundance was closely associated with period of low salinity (0.50 to 5.60 ‰), which coincided with the period of low transparency and low DO in the rainy season. The correlation analyses of Tilapia guineensis fingerlings with the water quality parameters yielded the following correlation coefficients (r)-0.598; (salinity); -0.644 (transparency); -0.710 (DO); -0.566; (temperature) and 0.129 (pH). The abundance of Tilapia guineensis fingerlings in the Lagoon was ultimately defined by a suitable regression equation. This result is expected to optimize the collection of fingerlings of Tilapia guineensis from the wild and boost food fish security in Nigeria and elsewhere.
  P.U. Uzukwu , T.G. Leton and N.A. Jamabo
  One of the priority research projects of the Nigerian Institute for Oceanography and Marine Research (NIOMR) is broodstock development and mass propagation of silver catfish, Chrysichthys nigrodigitatus, of which the broodstock is naturally abundant in New Calabar river. Selected physical characteristics and water physico-chemical parameters of the upper reach of the New Calabar river at Aluu were investigated. The highest depth value of 9.20 m was recorded in the middle of the river. The width of the river measured during spring high tide and low tide were 174 and 110 m, respectively. The cross-sectional area and average flow velocity of the river were 797.13 m2 and 0.374 m sec-1, respectively. The discharge of the river was computed as 298.13 m3 sec-1. The river water was acidic most of the period (hydrogen ion concentration, pH: 5.12-7.43), with low total alkalinity values (4.00-12.00 mg CaCO3 L-1) and low total hardness values (11.5-51.2 mg CaCO3 L-1) which indicate that the river water is black and soft. There was significant (p≤0.05) seasonal variation in temperature (23.1-31.7°C), Secchi transparency (9.30-19.00 cm), total hardness (11.5-51.2 mg CaCO3 L-1), dissolved oxygen (5.20-7.50 mg L-1) and dissolved oxygen deficit (0.02-2.95 mg L-1). These results are useful for several stake holders who use the river as a sink for trade wastes, source of water for fish farming, source of broodstocks of Chrysichthys nigrodigitatus, raw water for water treatment plants and means of transportation of industrial materials.
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