Wildlife & Fisheries management

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Author: search.filters.author.Olukunle, O. A.Subject: search.filters.subject.Haematology

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    Haematological changes of Clarias gariepinus juveniles fed different dietary lipid
    (Fisheries Society of Nigeria, 2012) Oshoke, J. O.; Olukunle, O. A.; Ajayi, A. I.; Dasuki, Saulawa, L. A. A.
    Twelve weeks feeding trial was conducted to determine the effects of different dietary lipid sources on the hematological changed in Clarias gariepinus juveniles, 6 iso-nitroginous diets were formulated at 45% CP and fed to triplicate groups of 15 juveniles. The feed contained (Palm Seed Oil (PSO), Ugwu Seed (USO), Soya Bean Oil (SBO), Almond Seed Oil (ASO), Mixture Of All the vegetable oil + the fish oil (MOA) and Cod Liver Oil (CLO) which is the control. The oils were added at 5% inclusion level respectively. Fish of mean weight 22.83+ 0.30g were fed these experimental diets in triplicate groups. The hematological analyses of fish showed that the red blood cell, white blood cell, Erythrocyte sedimentation rate (ESR), Mean cell volume (MCV), Mean cell Haemoglobin (MCH) and packed cell volume were not significantly different (p<0.05), but haemoglobin concentration and Mean cell haemologlobin concentration (MCHC) were significantly different (p>0.05). The present study showed that PSO, USO, ASO, SBO and MOA can effectively replace cod liver oil without compromising the health of African catfish, Clarias gariepinus.
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    Hormonal and haematological responses of Clarias gariepinus (Burchell 1822) to nitrite toxicity
    (Medwell Journals, 2007) Ajani, F.; Olukunle, O. A.; Agbede, S. A.
    Study on hormonal and haematological responses of Clarias gariepinus to nitrite toxicity was carried out to know the magnitude of the effects of this stressor on fish physiology. Haematological responses of C. gariepinus to sub-lethal levels of nitrite (0.1 g L-1) at different exposure h (0, 6, 24, 48, 72 and 96 h) were carried out. Blood samples of C. gariepinus were collected at each exposure h and evaluated for primary and secondary stress indicators. Data obtained were subjected to simple descriptive analysis, analysis of variance and Pearson Product Moment correlation analysis. When exposed to nitrite, there was progressive increase in plasma cortisol level of C. gariepinus from 0 h (101.00± 0.10 ng dL-1) to 48 h (161.00± 1.20 ng dL-1), this later decreased at 72 h (107.00±1.60 ng dL-1), it increased in 96 h to 136.00±1.00 ng dL-1. PCV and Hb were elevated after 6 h of exposure and decreased significantly (p<0.05) at 48, 72 and 96 h of exposure in fish exposed to sub-lethal level of nitrite. From the value of 3.69±0.01 106/l recorded at 0 h, RBC level decreased significantly (p<0.05) at 6 h, this was followed by significant increase (p<0.05) at 24 h. The RBC value later decreased gradually to 2.20±0.56 106 L-1 at 96 h. The study shows that hormonal and haematology balances of C. gariepinus was affected on short term exposure to nitrite toxicity.
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    The nutritional value of cow blood meal and its effects on growth performance, haematology and plasma enzymes of hybrid catfish
    (2002) Olukunle, O. A.; Ogunsanmi, A. O.; Taiwo, V. O.; Samuel, A. A.
    The nutritional potential of sun-dried cow blood meal (CBM) was investigated for its effect on growth performance, haematology and plasma enzyme activities in hybrid catfish fingerlings (Clarias gariepinus Male x Heternbrunchus longifilis Female), in an assay that lasted for twelve weeks. Six graded diets containing 0, 5, 10, 15, 20 and 25 percent of CBM were compounded. Ten fingerlings (mean weight 4.23+0.64g) per tank were reared under laboratory conditions in eighteen plastic tanks, each containing 12 liters of water. The fingerlings were fed 3% of their body weight daily, with bimonthly adjustments. At the end of the 84-day experiment, growth performance parameters such as weight gains, specific growth rate (SGR) and feed conversion ratio (FCR) were determined. Blood samples were pooled from each treatment on days 0, 42 and 84 for haematotogical and plasma enzyme analyses. The specific growth rate and the feed conversion ratio were best in the fish fed the control (0% sun-dried CBM) diet and poorest in the fish fed 25% CBM diet inclusion. There were no significant differences (P>0.05) between mean daily weight gains, specific growth rate and feed conversion ratios of fish fed diet 2 (5% CBM) and the control diet. The higher the inclusion level of the sun-dried CBM in the experimental diets, the poorer the nutrient utilization and growth performance. Hematological and pIasma enzyme analyses revealed progressively severe macrocytic normochromic, anaemia, leucocytosis and high enzymatic activities of plasma alanine aminotransferase (ALT) and-aspartate aminotransferase (AST), gamma-glutamyl transferase (GGT) and alkaline phosphatase (ALP) in fish fed increasing levels of sun-dried CBM. These enzymatic changes imply liver, kidney and/or cardiac damage, and opportunistic systemic bacterial infection. It can be inferred that for optimum growth performance, best nutrient utilization and unimpaired haematological and plasma enzyme activities in hybrid Clarias, a 5 % level of sun-dried CBM inclusion in their diet is recommended.