University of Khartoum

Comparative Study of Blood Constituents of Four Nile fish From Different Evolutionary Levels

Comparative Study of Blood Constituents of Four Nile fish From Different Evolutionary Levels

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Title: Comparative Study of Blood Constituents of Four Nile fish From Different Evolutionary Levels
Author: Mohamed, Elagba Haj Ali
Abstract: The blood constituents of four Nilefish from different evolutionary levels: Protopterus annectens (Cuvier), Oreochromis niloticus (Linnaeus), Clarias lazera (Cuvier & Valencienres) and the lungfish Polypterus senegalus (Owen) were determined and compared. Haemoglobin, total serum protein, urea, uric acid, sodium and potassium ions were significantly different (p<0.05). Alb/Glb ratio was (0.78 – 0.86), opposite to the normal ratio in higher animals, except P. annectens which showed same Alb/Glb ratio of higher animals. Highest level of urea was found in P. annectens (19 ± 3 mg/dl) and the level in aestivated was (4 - 5) folds the free-living fish. Urea was (3 ± 1 and 4 ± 2 mg/dl) in O. niloticus and C. lazera, respectively. No urea was found in P. senegalus. Uric acid was (4 ± 2.3 and 5 ± 1.6 mg/dl) in O. niloticus and C. lazera, respectively, (0.4 ± 0.1 mg/dl) in P. senegalus. No uric acid was detected in free-living P. annectens. Na+ (107 ± 4.0 - 130 ± 8.0 mmol/l), K+ (2.8 ± 0.4 - 6.4 ± 2.3 mmol/l), higher in O. niloticus and C. lazera, and least in. P. senegalus. In the aestivated P. annectens, Na+ was (140 ± 15 mmol/l), K+ (12.5 ± 2.3) compared to Na+ (110 ± 0.4 mmol/l) and K+ ( 4.8 ± 1.0 American Journal of Research Communication www.usa-journals.com Mohammed, 2014: Vol 2(3) 44 ajrc.journal@gmail.com mmol/l) in the free-living form. High concentration of safe nontoxic urea in blood of aestivated lungfish is an adaptation to aestivation. High levels of Na+ and K+ resulted from respiratory evaporation during aestivation. Blood constituents and nitrogenous end products could be used to distinguish genera and species of fish. The pattern of excretion of nitrogenous wastes ageed with the evolutionary position of the four fishes along the evolutionary scale.
URI: http://khartoumspace.uofk.edu/123456789/24531


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