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The effect of dietary fatty acid composition on growth, survival, and hepatopancreas enzymes under temperature stress and hypoxia in Litopenaeus vannamei
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Samira Mobaraki   , Narges Javadzadeh * , Hadide Mabudi , Mahmoud Hafezieh , Mojghan Khodadadi |
| Department of Fisheries, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran |
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Abstract: (79 Views) |
| This study aimed to investigate the effect of dietary fatty acid composition on growth, survival, and hepatopancreas enzymes under temperature stress and hypoxia in western white leg shrimp (Litopenaeus vannamei). For this purpose, shrimps were tested with 3 diets and under 3 stress treatments (1: no challenge to environmental stresses; 2: with hypoxic stress (2 ± 1 ppm); 3: with increasing temperature stress (36 ± 2 ° C). After the end of the experimental period, the highest survival rates in treatments 1 and 3 were 91.11 and 86.67%, respectively. The obtained results showed that the consumption of diet 1 compared to diet 2 shows a 90% survival rate. There was a significant difference in specific growth rate between treatments so that the highest rate was obtained in treatment 1 and the lowest in treatment 2 (P <0.05). The results showed that the use of concentrate feed containing 7.02% fat including 5% saturated fatty acids and 13% unsaturated fatty acids increased the growth and survival of shrimp. The results of physical and chemical parameters of water on different days showed that there was no significant difference between different treatments (P<0.05). The results of aspartate aminotransferase (AST) in different treatments showed that there is a significant difference between the amount of this enzyme (AST) in different diets before and after environmental stress (P>0.05). In shrimp fed with diet 2, the amount of enzyme during temperature stress (285.83 ± 17.7) showed the highest increase in the amount of enzyme titer, which was more than 3 times the amount of enzyme in pre-stress conditions. Based on the results, the amount of alanine aminotransferase (ALT) in shrimp fed with diets 2 and 3 increased sharply. Also, the measurement results of this enzyme in different treatments were significantly different (P>0.05). In the study of hemolymph enzyme (ALT / AST test), the effect of environmental stresses was found and the titer of ALT enzyme in red-head shrimp was increased almost 3 times compared to healthy shrimp. |
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| Keywords: Fatty Acid, Growth, Survival, Redhead Complication, Environmental Stress, Whiteleg Shrimp |
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Full-Text [PDF 536 kb]
(36 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2021/06/18 | Accepted: 2021/08/19 | Published: 2024/09/22
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