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Showing 2 results for Beluga Sturgeon

Mahmoud Mohseni, Maryam Aftabgard, Mohammad Hassanzadeh Saber, Kadusa Moazenzadeh,
Volume 11, Issue 1 (3-2022)
Abstract

This study aims to compare effects of sources levels of zinc on growth and carcass quality, some haematological and serological indices of juvenile beluga sturgeon, Huso huso (Linnaeus, 1758). A number of 315 juvenile beluga sturgeon (8.4±0.29) were fed in 21 500 lit fiberglass tanks (15 fish per tank) under 7 experimental diets including 1 control diet plus 6 diets containing zinc (mg per kg of diet) in two forms of mineral (zinc sulfate) (ZnSul15, ZnSul30, and ZnSul60 treatments) and organic (chelated with methionine) (ZnMet15, ZnMet30, and ZnMet60 treatments) with three replications per treatment for 12 weeks. The best values of final weight and feed conversion ratio were observed in the ZnMet15 and ZnMet60 treatments. Red blood cells, hemoglobin, and hematocrit showed an incremental trend influenced by increased zinc supplement. Increased carcass protein in the ZnMet30 treatment was significant compared to the control, ZnSul15, and, ZnSul30 treatments (P≤0.05). Reduced carcass lipid in the ZnSul30 and ZnSul60 treatments was significant compared to the other treatments (P≤0.05). Serum triglyceride and cholesterol decreased in the ZnMet treatments compared to the control treatment. Reduced serum glucose in the ZnMet15 and ZnMet60 treatments and also increased serum lysozyme in the ZnMet30 and ZnMet60 treatments were significant compared to the control treatment (P≤0.05). Results demonstrated that most of the indices had better performance in the ZnMet treatments comparted to the other treatments and are proposed as an optimal diet for juvenile beluga sturgeon.
 

Volume 15, Issue 84 (2-2019)
Abstract

Gelatine is one colloidal protein that it used the most widely in the food, pharmaceutical, medical and military industry. Annually , considerable amounts of gelatine for different uses were transfered into the country. In other hand, the Caspian Sea is the rich sources of fishes such as Beluga sturgeon, carp, Caspian White fish and etc, that significant amounts of residue which is lost as waste that can be a good source to extract gelatine. In this study the effect of different extraction methods gelatine (I, II, III and IV) of beluga skin was examined. Results showed that the highest melting point, yeild and absolute viscosity gelatin extracted were observed in II, III and III methods, respectively. The gelatine viscosity decrease with increasing concentration of sodium hydroxide (method II and IV), and with smaller amounts of (Methods I and III), increases. Also, using the Arrhenius equation to determine the relation between viscosity gelatine and temperature were used, then activation energy calcuated in the range 16.31 to 32.66 kJ / mol respectively. Finally, using exponential and power models viscosity gelatine was fitted with Brix. Modeling results indicated that the exponential model was more accurate in predicting the gelatine absolute viscosity

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