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Articles by O.K. Kareem
Total Records ( 4 ) for O.K. Kareem
  A.E. Falaye , E.K. Ajani , O.K. Kareem and A.N. Olanrewaju
  Fisheries of Erelu reservoir, South Western Nigeria was assessed using fleet of gillnets of varied mesh sizes with the intent of generating necessary data that could support sustainable use and management of the resources to enhance the socio-economic status of the riparian communities. The reservoir was stratified into upper, middle and lower zones covering an average of 1000 m each and gillnets was deployed to the shores and open water region in each zones monthly for 21 months covering 2 wet and 2 dry seasons. Fish caught were identified to lowest taxonomic level and morphometric parameters taken following standard procedures. A total of 6,927 samples belonging to 16 species and 8 families were encountered throughout the study period. Seasonally, more fish samples were recorded during the dry season (57.95%) than wet seasons. When catches were compared spatially, lower zone recorded 38.89% followed by the upper zone with 34.29% and the middle zone 26.82%. However, highest catches were recorded at the shore (57.82%). Three families: Cichlidae, Cyprinidae and Clariidae constituted 72% of the total catches and were dominated by O. niloticus, R. senegalensis, C. nigrodigitatus, S. melanotheron, S. mystus and T. marie. The forage-carnivore ratios of 1.9:1 and 1.6:1 by number and weight, respectively, recorded suggests an incongruous ecological balance. The potential fish yield was estimated as 136.55 kg ha–1 and catch per unit effort of 8.8 kg per fisherman per day was recorded. Regular monitoring of the fish composition and stocking of more forager species is recommended to balance the community structure.
  E.K. Ajani , A.N. Olanrewaju and O.K. Kareem
  The effect of sex combinations on growth and survival of African catfish was evaluated using haematological indices. This study was conducted at the Wet Laboratory of Aquaculture and Fisheries Management Department, University of Ibadan. The experimental set-up involved four treatments labelled as NP (Natural population), MM (Only Male population), FF (Only Female population) and MF (Male and Female population). Juvenile C. gariepinus (66.56±2.25 g) were randomly stocked in twelve plastic aquaria (2.9 m3) at a density of 10 fish/tank and fed twice daily in split-rations with commercial diet of 42% crude protein at 3% b.wt. for 84 days. The differences in blood and plasma concentrations in fish before and after experiment were noted. The Pack Cell Volume (PCV) of the treatment groups (32.00±0.10 g L-1) increased significantly relative to initial value (24.00±0.01), while their platelets counts showed significant variations compared to that of initial value. Significantly, Red Blood Cell (RBC) in treatments decrease (2.62±0.01-3.81±0.00 mg dL-1) compared to initial value (11.77±0.00 mg dL-1). However, there was no significant difference (p>0.05) in the mean Hemoglobin (Hb) values between the initial (8.00±0.10 g L-1) and treatment groups. Also, the treatment groups showed a significant variation in serum biochemical values of total protein (6.00±0.01), albumin (2.23±0.33), cholesterol (105.00±1.00), aspartate aminotransferase (208.00±0.23) and glucose (27.00±0.28) compared to the initial values, total protein (5.27±0.01), albumin (0.75±0.01), cholesterol (117.84±0.02), aspartate aminotransferase (56.90±0.01) and glucose (64.77±0.01). There was also a significant increase in the creatinine concentrations. Hence, it can be concluded that the slight haematological changes observed between the initial value and treatment groups values cannot significantly affect the health of C. gariepinus reared under different sex combinations.
  O.K. Kareem and A.N. Olanrewaju
  Management of C. gariepinus fry in recirculating tank is one modern technique applied for fish culture in Nigeria. Since, this system is gaining popularity nationwide there is a dare need to investigate appropriate stocking density as already established for both concrete tanks and earthen pond system. Clarias gariepinus fry (0.14±0.01 g) were reared in indoor recirculating tanks (60.5 m3) at three different stocking rates 5000, 8000 and 12000 fry/tank as treatment LD, MD and HD respectively for a period of eight weeks. The experiment was duplicated and fish were fed 45% crude protein diet at 5% in four installments daily. The mean body weight gain and SGR decreased with increasing stocking density. The best growth performance (weight gain, length gain and SGR) was achieved in treatment LD. The lowest FCR (1.04±0.01) value was obtained in HD but show no significant difference (p>0.05) to other treatments. Percentage survival of the fish was significantly (p<0.05) affected by the stocking density with the highest value recorded in LD (86.8%). Water-quality parameters were within the recommended ranges throughout the experimental period. From this study, the stocking density of 5000 fry m‾3 is recommended for efficient feed utilization, optimum growth performance and survival in a re-circulatory culture system.
  O.K. Kareem , O. Orisasona and A.N. Olanrewaju
  There is a growing concern on the safety of frozen fish imported from various parts of the world where the levels of contamination of water bodies may not be well ascertained and regulatory measures not strictly adhered to. Concentrations of four heavy metals (Lead (Pb), Cadmium (Cd), Copper (Cu) and Mercury (Hg)) in the muscle, gill and liver were investigated for three most consumed frozen fish species (Umbrina canosai, Clupea harengu and Scomber scombrus) within Ibadan, metropolis. Samples were digested as described by FAO/SIDA. The concentrations of metals were quantified using a Varian AA240 Fast Sequential Flame Atomic Absorption Spectrophotometer (AAS). Heavy metals like Cd, Cu and Hg were significantly higher (p<0.05) in the liver of the three species than in the muscle and gills. There was no significant difference in the Pb concentration for the three organs in S. scombrus, whereas, Pb was significantly higher in the liver of U. canosai (9.73 mg kg–1) and C. harengus (4.40 mg kg–1) than in the muscle (6.92 and 2.11 mg kg–1, respectively) and gill (8.73 and 2.52 mg kg–1, respectively). Copper concentration was marginally higher in S. scombrus (5.06 mg kg–1) with the least value recorded in U. canosai (3.28 mg kg–1). However, no significant variation (p>0.05) was observed in the muscle Cd, Cu and Hg levels for the three species. Comparatively, S. scombrus has the highest concentration of heavy metals. This study revealed that the heavy metals investigated in the major organs and flesh was all above the limits recommended by World Health Organization.
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