Black mouth croaker (Atrobucca nibe) is considered as a new and valuable fish stock in the deep water of the Oman Sea. In this study, nonmarket sized of the fish was subjected to produce surimi and kamabako gel manually and changes in the physical and microstructure pro More
Black mouth croaker (Atrobucca nibe) is considered as a new and valuable fish stock in the deep water of the Oman Sea. In this study, nonmarket sized of the fish was subjected to produce surimi and kamabako gel manually and changes in the physical and microstructure properties of them during 6 months at freezing conditions were investigated. With increasing storage time, whiteness index from 66.24±0.20% to 60.11±0.23% and gel strength from 583.53±56.583 to 303.60±31.518 cm.g reduced after six months at frozen storage. The maximum expressible moisture content of kamabako gel sample (7.42 ± 0.268%) was obtained in six months storage (p<0.05). With increasing storage time, quality score of surimi gel decreased to 3.75±0.500 grade. Due to increase the shelf life, rough and irregular of protein structures were appeared in the protein network of the surimi. The average number of surimi polygonals were significantly decreased from 15038±280 to 10399±564 number per mm2 and their area were significantly increased from 27±0.9 to 84±4.5 µm2, with increasing storage time (p<0.05). The results indicated that in spite of relative decreasing in the functional properties of surimi proteins due to denaturation, produced surimi acceptable after six months at frozen storage.
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The present study investigated the effect of nanoliposome-coated astaxanthin (NA) in the diet on growth indices of rainbow trout. A total of 375 fish with an average initial weight of 31.00±2.00 g were divided into five treatments including 0 (control), 25, 50, 7 More
The present study investigated the effect of nanoliposome-coated astaxanthin (NA) in the diet on growth indices of rainbow trout. A total of 375 fish with an average initial weight of 31.00±2.00 g were divided into five treatments including 0 (control), 25, 50, 75 and 100 mg kg-1 NA. Each treatment had three replications and each replication contained 25 pieces of fish that were randomly stored in 15 tanks with capacity of 200 liter and fed with food related to the same treatment for 60 days. The results showed that the highest percentage of weight gain (225.22±13.80) was related to the treatment of 75 mg kg-1 NA and the lowest (194.57±12.88) was related to the treatment of 100 mg kg-1 NA. Also, the highest daily growth rate (%) with 2.51±0.10 g d-1 was from the treatment of 75 mg kg-1 NA, which was significantly higher than the amount in the control (p <0.05). The highest rate of food efficiency was from the treatment of 75 mg kg-1 NA. The finding of the present study indicated that 83.61 mg NA has the best effect on the growth of rainbow trout and is recommended for culturing of this fish.
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