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The effect of thyroxine hormone on the survival and some safety indicators in the early stages of growth of rainbow trout (Oncorhynchus mykiss)
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Fatemeh Kiapour *   , Abdolmajid Hajimoradlou , Rasoul Ghorbani , Ali Hajibeglou |
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Abstract: (56 Views) |
| This study was conducted with the aim of investigating the effect of different levels of thyroxine hormone in rearing water and diet on survival and some mucus immunity indicators in the early stages of growth of rainbow trout. The experiment was carried out in three stages: hatched eggs until complete hatching, hatched larvae until active feeding, and active feeding until weighing about 1 gram of fry fish. In each stage, the experiment was performed in three concentrations of thyroxine solution (0.03, 0.06 and 0.09 mg/L) along with the control group (without thyroxine hormone) with 3 repetitions. Thyroxine was added to water in the first and second stages and to food in the third stage. At the end of the third stage, survival and some mucus safety indicators were investigated. The results showed that the highest survival rate was obtained in the treatment 9 with 98.67 ± 1.33. The immune indices of total protein, immunoglobulin and lysozyme showed a significant difference compared to other treatments (p<0.05). The highest amount of protein (2.08 ± 0.18 mg/ml), immunoglobulin level (0.65 ± 0.09 g/dL) and lysozyme level (1.90 ± 0.02 μg/ml) were recorded in the treatment.9. According to the present study, thyroxine hormone has led to positive effects on survival percentage and some safety indicators in rainbow trout fry. |
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| Keywords: thyroxine hormone, rainbow trout, survival, immune indicators |
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Full-Text [PDF 804 kb]
(5 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2023/08/25 | Accepted: 2023/09/26 | Published: 2025/06/27
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