Data/hora: 07/06/2024 08:10:10

Provedor de dados: | 20
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