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In order to study the effect of hypoxia stress on serum of biochemical and non-specific immune indexes of the juvenile cobia(Rachycentron canadum), the fish with body weight of (50.44±2.78) g were treated at dissolved oxygen content of (3.15±0.21) mg/L for 4 weeks. The samples were taken on 1 d, 7 d, 14 d and 28 d respectively for determination of relevant indexes and results showed that: (1) the growth of juvenile cobia was inhibited by hypoxia, the weight gain rate and specific growth rate were significantly lower than the control level (p<0.05); (2) the indexes of liver function showed that activities of aspartate aminotransferase and alanine aminotransferase significantly increased (p<0.01) on 7 d, 14 d, 28 d and 14 d, 28 d respectively, while the content of total protein and albumin significantly increased (p<0.05) on 14 d and 28 d than that of the control group; (3) the content of blood glucose significantly increased (p<0.05) on 1 d, 14 d and 28 d, while the triglyceride significantly increased (p<0.01) on 14 d and 28 d. The total cholesterol content significantly decreased (p<0.05) on 1 d, then continue to increase; (4) the serum ion content changed with different trend, in which sodium ion and chloride ion significantly increased (p<0.01) on 14 d and 28 d. Potassium content increased continuously and was significantly higher (p<0.05) on 7 d, 14 d and 28 d than control level, while calcium content continued to decrease and there was a significant difference (p<0.05) on 14 d and 28 d; (5) activitie of superoxide dismutase and content of malondialdehyde continued to increase and were significantly higher (p<0.01) than those in the control group on 7 d, 14 d, 28 d and 14 d, 28 d respectively. Activities of catalase showed significantly “decreased-increased-decreased” patterns. Activitie of lysozyme significantly increased (p<0.05) on 1 d and then continued to decrease. These results showed that hypoxia stress caused oxidative damage to the juvenile cobia, inhibited its growth and led to significant change in serum biochemical and non-specific immune indexes, which indicating that the nutrient utilization and immune system of cobia were affected.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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