Data/hora: 01/06/2024 06:28:35

Provedor de dados: 	Ocean Docs: e-repository of  publications	
País: 	Belgium	
Título: 	The immune response of tilapia Oreochromis mossambicus and its susceptibility to Streptococcus iniae under stress in low and high temperatures	
Autores: 	Ndong, D.; Chen, Yu Yuan; Lin, Yu Hung; Baskaralingam, V.; Chen, Jiann Chu.	
Data: 	2008-08-19	
Ano: 	2006	
Palavras-chave: 	Immunology; Fish culture; Fish diseases; Temperature effects; Aquaculture; Biological stress; Immunology; Fish culture; Aquaculture; Fish diseases; Http://aims.fao.org/aos/agrovoc/c_3808; Http://aims.fao.org/aos/agrovoc/c_2918; Http://aims.fao.org/aos/agrovoc/c_550; Http://aims.fao.org/aos/agrovoc/c_2920.	
Resumo: 	Mozambique tilapia Oreochromis mossambicus acclimated to 27 °C were then held at 19, 23, 27 (control), 31 and 35 °C, and were examined for non-specific cellular and humoral responses after 12–96 h. Total leucocyte count decreased significantly when fish were transferred to 19 and 23 °C after 48 and 96 h, and when transferred to 35 °C over 12–96 h, respectively. Respiratory burst decreased significantly when fish were transferred to 19, 31 and 35 °C over 24–96 h, whereas phagocytic activity and phagocytic index decreased significantly when fish were transferred to low temperatures (19 and 23 °C) and high temperatures (31 and 35 °C) over 12–96 h. Lysozyme activity decreased significantly when fish were transferred to 19 °C after 12–96 h, but increased significantly when transferred to 31 and 35 °C over 48–96 h. Alternative complement pathway (ACH50) also decreased significantly when transferred to 19 and 23 °C after 12 h, but increased significantly when transferred to 31 and 35 °C after 24 h. In another experiment, tilapia reared at 27 °C were injected intraperitoneally with Streptococcus iniae at a dose of 1 × 107 colony-forming units (cfu) fish−1, and then reared onward at water temperatures of 19, 23, 27 (control), 31 and 35 °C. Over 48–168 h, the cumulative mortality of S. iniae-injected fish held in 19 and 35 °C was significantly higher than that of injected-fish held in 23, 27 and 31 °C. It is concluded that transfer of tilapia O. mossambicus from 27 °C to low temperatures (19 and 23 °C) after 12 h, and transfer of fish from 27 °C to high temperatures (31 and 35 °C) reduced their immune capability. Moreover, tilapia under temperature stress at 19 and 35 °C from 27 °C decreased its resistance against S. iniae.	
Tipo: 	Journal Contribution	
Idioma: 	Inglês	
Identificador: 	Fish and shellfish immunology. p. 1-9

1050-4648

http://hdl.handle.net/1834/2614	
Editor: 	Elsevier	
Relação: 	10.1016/j.fsi.2006.08.015