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Impact of transportation in freshwater and brackish water on Nile tilapia (Oreochromis niloticus) resistance
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Abstract
Background
Oreochromis niloticus
has great economic value and potential for farming and development. Transportation of fish was done for breeding or trading purpose and it is a challenging aspect of aquaculture. This study aimed to investigate the effect of transportation in freshwater and brackish water on the resistance of
O. niloticus
as well as transportation stress mitigation effect of NaCl. Four equal groups were used; each of 50 fish, the 1st group served as the control (P 1), while the 2nd group (PT 2) was transported in water without salt, the 3rd (PT 3) and 4th (PT 4) groups were transported in water containing 5 gL
− 1
and 10 gL
− 1
salt respectively. PT 2, PT 3 and PT 4 were transported for 5 h without any rest or sedative drugs.
Results
The serum cortisol of
O. niloticus
significantly increased at 0 h and then decreased at 12 and 24 h post transportation in the PT 2 group and non-significantly increased at all point times in the PT 3 and PT 4 groups comparing to P 1 group. Mucin2 gene (MUC2) expression was non-significantly up regulated in the PT 2 group and down regulated in the PT 3 and PT 4 groups at 0 h comparing with P 1 group, but at 12 and 24 h it was significantly up regulated in the PT 2, PT 3 and PT 4 groups. The β Defensin-1 (β D1) and 2 (β D2) genes expression was non-significantly down-regulated in the PT 2 group and significantly up regulated in the PT 3 and PT 4 groups at 0 h., while at 12 and 24 h was significantly down regulated in the PT 2 group and non-significantly down regulated in the PT 3 and PT 4 groups, it significantly down regulated in the PT 2 and PT 3 group and non-significantly down regulated in the PT 4 group at 24 h. Non-significant up regulation in interleukin − 1β (IL-1β) gene expression was reported in the PT 2 group and non-significant down regulation in the PT 3 and PT 4 groups at 0 h. However, significant up regulation was recorded in the PT 2, PT 3 and PT 4 groups at 12 and 24 h. The Tumor necrosis factor-alpha (TNF–α) gene expression was non-significantly up regulated in the PT 2 group and non-significantly down regulated in the PT 3 and PT 4 groups at 0 h. However, it was significantly up regulated in the PT 2, PT 3 and PT 4 groups at 12 and 24 h.
Conclusion
The results of this study confirmed the stressful effect of transportation on
O. niloticus
as well as the transportation stress mitigation effect of NaCl.
Springer Science and Business Media LLC
Title: Impact of transportation in freshwater and brackish water on Nile tilapia (Oreochromis niloticus) resistance
Description:
Abstract
Background
Oreochromis niloticus
has great economic value and potential for farming and development.
Transportation of fish was done for breeding or trading purpose and it is a challenging aspect of aquaculture.
This study aimed to investigate the effect of transportation in freshwater and brackish water on the resistance of
O.
niloticus
as well as transportation stress mitigation effect of NaCl.
Four equal groups were used; each of 50 fish, the 1st group served as the control (P 1), while the 2nd group (PT 2) was transported in water without salt, the 3rd (PT 3) and 4th (PT 4) groups were transported in water containing 5 gL
− 1
and 10 gL
− 1
salt respectively.
PT 2, PT 3 and PT 4 were transported for 5 h without any rest or sedative drugs.
Results
The serum cortisol of
O.
niloticus
significantly increased at 0 h and then decreased at 12 and 24 h post transportation in the PT 2 group and non-significantly increased at all point times in the PT 3 and PT 4 groups comparing to P 1 group.
Mucin2 gene (MUC2) expression was non-significantly up regulated in the PT 2 group and down regulated in the PT 3 and PT 4 groups at 0 h comparing with P 1 group, but at 12 and 24 h it was significantly up regulated in the PT 2, PT 3 and PT 4 groups.
The β Defensin-1 (β D1) and 2 (β D2) genes expression was non-significantly down-regulated in the PT 2 group and significantly up regulated in the PT 3 and PT 4 groups at 0 h.
, while at 12 and 24 h was significantly down regulated in the PT 2 group and non-significantly down regulated in the PT 3 and PT 4 groups, it significantly down regulated in the PT 2 and PT 3 group and non-significantly down regulated in the PT 4 group at 24 h.
Non-significant up regulation in interleukin − 1β (IL-1β) gene expression was reported in the PT 2 group and non-significant down regulation in the PT 3 and PT 4 groups at 0 h.
However, significant up regulation was recorded in the PT 2, PT 3 and PT 4 groups at 12 and 24 h.
The Tumor necrosis factor-alpha (TNF–α) gene expression was non-significantly up regulated in the PT 2 group and non-significantly down regulated in the PT 3 and PT 4 groups at 0 h.
However, it was significantly up regulated in the PT 2, PT 3 and PT 4 groups at 12 and 24 h.
Conclusion
The results of this study confirmed the stressful effect of transportation on
O.
niloticus
as well as the transportation stress mitigation effect of NaCl.
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