title: Effect of different stress factors on some physiological parameters of Nile tilapia (Oreochromis niloticus).
abstract: This study was conducted to determine the effect of different stress factors on some physiological measurements of Nile tilapia (Oreochromis niloticus). A total number of 160 Nile tilapia, the body weight ranging between 100 and 120 g, were exposed to three stress factors of hypoxia, overcrowding and starvation for different periods 24, 72 and 144 h. The results of cortisol level were 134.15, 144.27, 154.12 ng/ml and 140.18 ng/ml for control, hypoxia, overcrowding and starvation, respectively, while after 144 h did not show significant difference among treatments compared with control group. In contrast, the values of T3 and T4 observed reduction with significant difference that T3 ranged between the highest value 122.12 ng/ml for control group to lowest value of starvation group 94.35, 93.81 and 88.46 ng/ml after 24, 72 and 144 h. Also, similar trend of results observed in T4 and blood glucose among treatments. And the enzymatic activity of lactate dehydrogenise (LDH) increased in hypoxic group, while a significant reduction appeared in overcrowding and starved fish compared to control group. The pyruvate kinase (PK) activity decreased in hypoxic group but increased in other group.
authors: Department of physiology, Animal Science Dammam Girls, Collage of Science, King Faisal Universiy, P.O. Box 10071, Al-Dammam 31433, Saudi Arabia.
authors: Aziza T F
authors: AT
authors: El-Khaldi
keywords: Hypoxia; LDH; Overcrowding; PK; Starvation; T3; T4
references: Physiol Biochem Zool. 2005 Sep-Oct;78(5):715-23
references: 16075393
references: J Mol Endocrinol. 2006 Dec;37(3):443-52
references: 17170085
references: Anal Biochem. 1971 Sep;43(1):183-7
references: 5130397
references: Environ Toxicol Chem. 2006 Oct;25(10):2593-600
references: 17022398
references: J Endocrinol. 2008 Aug;198(2):403-17
references: 18505847
references: Comp Biochem Physiol A Mol Integr Physiol. 2008 Dec;151(4):560-5
references: 18682299
references: J Neuroendocrinol. 2004 Mar;16(3):279-88
references: 15049859
references: Bull Environ Contam Toxicol. 2007 Nov;79(5):488-93
references: 17943219
references: Physiol Rev. 1997 Jul;77(3):591-625
references: 9234959
references: J Exp Biol. 1986 Jul;123:123-44
references: 3746191
references: Vet Immunol Immunopathol. 2002 Jan 1;84(1-2):17-27
references: 11825595
references: Integr Comp Biol. 2002 Jul;42(3):517-25
references: 21708747
references: J Exp Zool. 1985 Apr;234(1):1-5
references: 3989491
references: Gen Comp Endocrinol. 1977 May;32(1):29-40
references: 67983
references: BMC Mol Biol. 2006 Sep 11;7:27
references: 16961934
references: Comp Biochem Physiol A Mol Integr Physiol. 2006 Jul;144(3):284-305
references: 16406825