Investigation of the effect of Amygdalus scoparia Spach and Zataria multiflora extract on the maintenance of Litopenaeus vannamei in a cold storage condition

In this study, in order to investigate the effect of oral and combined gum coating and thyme extract on keeping vanilla shrimp in cold storage conditions (1.4° C), different treatments including: 1-control (immersion in distilled water and without coating), 2- coated treatment Consumed with 1% thyme essential oil, 3-1% coated gum-coated treatment and 4-combined treatment with 1% thyme-coated essential oil - 1% dehydrated gum, were tested every 4 days for a period of 12 days. Microbial tests; Counting the number of enterobacteriaceae and chemicals; TBA and TVN values ​​were measured and melanosis was evaluated as well. With increasing in the retention time, the enterobacteria, TVN, TBA values ​​and melanosis intensity significantly increased in the control treatment (P <0.05). The effect of 1% thyme coating and combined treatment on the number of enterobacteria was significant and could control the enterobacteria during the storage period (P <0.05) and Zedo gum-coated treatments did not have any significant effect on controlling the samples against texture corruption as well.