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The effect of gamma-aminobutyric acid on the growth and survival indices of rainbow trout fry stressed by high stocking density
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Narges Alishah   , Farid Firouzbakhsh * , Zibandeh Mehrabi |
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Abstract: (546 Views) |
| This research aimed to investigate the effect of gamma-aminobutyric acid supplementation on the growth and survival indicators of rainbow trout fry kept at high density, for this purpose, 585 fry with an average weight of 5 ± 0.03 grams in 5 experimental treatments with High density (129 pieces in 69 liters) and a negative control group with normal density (69 pieces in 69 liters) were included. The test treatments included a positive control group, treatments 100, 200, and 300, which were fed with gamma-aminobutyric acid supplement sprayed to the commercial diet at the rate of 0, 100, 200, and 300 mg/kg, respectively during 7 weeks, . At the end of the breeding period, the growth indices including weight gain, food conversion coefficient, specific growth coefficient, specific growth rate, condition factor, protein yield ratio, and survival percentage were examined. In all the growth indices, there was a significant increase in the feeding groups. Gamma-aminobutyric acid supplement compared to the negative control group was observed, the highest of which was related to the treatment of 300 mg of GABA supplement (P < 0.05). The lowest food conversion factor among the experimental treatments was related to the 300 mg group, which had a statistically significant difference with the positive control group (P<0.05, no deaths were observed in any of the groups. The results showed that adding a gamma-aminobutyric acid supplement to the diet of rainbow trout raised in high density moderates the negative effects of stress resulting from high density on growth indicators and improves these indicators. |
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| Keywords: Gamma-aminobutyric acid, Rainbow trout, High density, Growth, Survival |
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Full-Text [PDF 599 kb]
(108 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2024/07/27 | Accepted: 2024/09/16 | Published: 2024/10/21
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