In this research, the effect of lemon extract (Citrus limonum) on the shelf life of fillet fish (Huso huso) during cold storage period was investigated. The effect of different levels of extract during a storage period of twelve days on the indicators of oxidative spoil More
In this research, the effect of lemon extract (Citrus limonum) on the shelf life of fillet fish (Huso huso) during cold storage period was investigated. The effect of different levels of extract during a storage period of twelve days on the indicators of oxidative spoilage and the number of bacteria (TVC & PTC) of fish fillets was carried out in the form of a completely randomized design with 4 treatments and three replications for each treatment.
According to the findings of the research, the trend of changes in oxidative spoilage indices in each treatment during the storage period indicates that the effect of different concentrations of lime extract and the effect of storage time on fish fillets were statistically significant. In the investigated time periods, the experimental treatments significantly (P<0.05) changed the thiobarbituric acid index and the rate of microbial load increase in the control treatment was far more than the experimental treatments, and the extract of 0.5% didnt have a significant effect on number of TVC during storage period, while the use of 1% extract significantly (P<0.05) ) has reduced the number of PTC bacteria. According to the results, the use of extract and the storage time of fillets are significantly effective on most indicators of bacterial and oxidative spoilage. The results showed the use of lime extract concentrations of 1 and 1.5% has the best effectiveness in preserving fish fillets, and it has antioxidant and antibacterial effects, and it can be used as a biodegradable extract to preserve.
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Breeding expansion of giant sturgeon (Huso huso) in different regions of Iran and production of formulated food in sturgeon farms by domestic factories and changes in the price of imported foods, caused the importance of appropriate diet selection. This research was con More
Breeding expansion of giant sturgeon (Huso huso) in different regions of Iran and production of formulated food in sturgeon farms by domestic factories and changes in the price of imported foods, caused the importance of appropriate diet selection. This research was conducted to evaluate the diets' biological performances and economic efficiency of some diets produced in Iran for rearing two-years-old Beluga for 45 days. Several 32 pieces of giant sturgeon with an average weight of 2156.94 ± 336.61 grams were labelled and cultured in 4 groups. 4 treatments including three types of Iranian food (treatments 1, 2, and 3) and an imported diet (treatment 4) were determined, which by default had different formulations in terms of protein and fat sources and amounts. Feeding set up according to the manufacturer's instructions based on stocking density (every 15 days Biometry) and water temperature. The results showed that the highest values of body weight gain, obesity coefficient, and the lowest food conversion rate were observed in treatment 2. In the comparison of red blood indices, except for the haematocrit percentage of treatment 4, which was higher, there was a difference in the treatments was not observed. But the difference in the number of white blood cells counts and the differential count in the treatments were significant. The fish fed with treatments 3 and 1 had lower amounts of liver enzymes compared to other treatments. Considering the costs related to each of the rations, overall, treatment 2 was preferred to other treatments.
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Abstract[1]
Nowadays dietary supplements such as immunostimulants and prebiotics are being applied as a potential replacement of antibiotics in preferment of health and creation resistance against diseases in aquaculture. This survey was conducted to evaluate the effic More
Abstract[1]
Nowadays dietary supplements such as immunostimulants and prebiotics are being applied as a potential replacement of antibiotics in preferment of health and creation resistance against diseases in aquaculture. This survey was conducted to evaluate the efficiency of commercial prebiotic Immunogen with main ingredients 30% (1, 3-1,6) ßglucan and 18% mannanoligosaccharide in ration of great sturgeon (Huso huso) juveniles in 8weeks in Shahid Marjani Sturgeon Propagation and Rearing Center in summer 2009. Hematological and immunological indices of great sturgeon juveniles in five treatments (0, 0.5%, 1%, 2% and 4%) of Immunogen in diet statistically compared. Three weight groups of great sturgeon juveniles with average weight 8.71±0.02 g, 25.15±0.01 g and 53.69±0.02 g were stocked in tanks and fed six times a day. The results showed the number of neutrophil in fishes fed with the diet supplemented with 0.5%, 1% and 4% Immunogen was significantly higher (P<0.05) than the control. Level of immunoglobulin M (IgM) in fishes fed with the diet supplemented with 0.5% Immunogen was higher than the other diet treatments. No significant difference was observed in other hematological indices between three weight of treatments and five treatments of Immunogen (P>0.05). It seemed that Immunogen in concentration 0.5% can serve as functional feedstuffs in the diet of great sturgeon juveniles by stimulating immunity responses.
*- Corresponding Authors; Email: mohajer_m@hotmail.com
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