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The effects of frozen storage (-20°C) of silver carp (Hypophthalmichthys molitrix) for periods of 0 (control), 2, 4 and 6 months on the qualitative properties of surimi powder was investigated. Qualitative characteristics were assessed through  analysis of proximate composition, sensory evaluation, color changes, density, oil adsorption capacity, water holding capacity, protein solubility, emulsifying capacity, emulsion stability, foam capacity and stability, gel forming ability, and thiobarbituric acid value. Most of the qualitative indices decreased significantly (p<0.05) in the treatments, including the water holding capacity and the percentage of protein solubility that, respectively, decreased from 13.4ml/g and 7.42% in the control to 10.46 ml/g and 4.82% after 6 months of frozen storage.  Besides, the treatments didn’t show foam. The density and thiobarbituric acid increased significantly with time (p<0.05). Based on the analyses as well as sensory assessment, quality of silver carp surimi powder was maintained in -20°C frozen storage up to four months.

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The purpose of this study is to analyze the effects of different fat levels and substitution of sodium chloride salt with potassium chloride on physic- chemical and sensorial properties and shelf life of fish sausage produced from minced fish in the refrigerator. To do this, the sausages have been produced with different fat levels (10, 15, 20 %) and substitution of part of sodium chloride with potassium chloride( 0.95 KCl+ 0.54 NaCl and 0.47 KCl+ 1.02 NaCl)and have been reserved in refrigerator for 30 days and physical, chemical and sensorial evaluations have been done. The results of analyzing the approximate composition and PH show salient differences between different formulations of sausage and the control sample (p<0.05). By adding KCl to formulation, the final products had higher harness in comparison to the control sample. Sensorial analyze didn't show any significant difference between the samples. Treatment with higher fat content got higher score in the textural properties but this difference was not significant (p> 0.05). There was not a salient difference in color, taste and total acceptance between samples and control sample. Generally sensorial properties reduced in time but this reduction was not significant. Increase of thiobarbituric acid has been observed in all treatment over time but this amount never violated the normal range in any treatments.

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The aim of this study was to fish burger enrichment with different omega-3 oil formation accompanied with Rosemary and Cinnamon extracts and evaluation of its stability in -18 ˚C. Omega-3 oil in forms of a) Emulsion and herbal extract (separately), b) encapsulated fish oil with herbal extract and c) emulsion and herbal extract (together) were added to Silver carp fish burger. Experimental treatments compared with different control treatments consist of encapsulated fish oil, fish oil and vegetable oil. Physico-chemical and sensorial assessments performed at 0, 1, 2, 3, 4 month during fish burger storage at -18 ˚C. Emulsion and rosemary extracts treatment showed the highest (69.85%) and encapsulated fish oil with rosemary extract depicted the lowest moisture content (68.38%) at fourth month, over burgers storage time. Fish burger enrichment with omega-3 oil had no distinctive effect on fat content at first day (P<0.05). Fortified burger in emulsion and rosemary and cinnamon treatments had lower free fatty acid contents than burgers with pure fish oil. Enrichment of fish burger with omega-3 oil showed no undesirable effects on nitrogenous compounds decomposition and accumulation of TVB-N in products (P>0.05). Panelist scores declared comparable texture and odor quality of fortified burger with control treatment, while flavor index was more impressed as enrichment process. From the results of this study in order to enrichment of fish burger rosemary and cinnamon emulsion is suggested.

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  The effects of boiling time (1-7 min) and concentration of salt solution (0-4%) on the quality of farmed pacific white shrimp (Litopenaeus vannamei) dried for 20 h at 60 ºC was determined. In all salt concentrations, the increase in boiling time from 1 to 7 min decreased shrimp weight (P < 0.05). The highest weight loss was found after 7 min. With increasing salt concentrations, hardness increased; the highest hardness was found when shrimp were boiled in 3% salt concentrations for 3 and 7 min (P < 0.05). At 5 and 7 min of boiling, salt concentrations of 0 and 2% led to the highest taste score while the higher salinity decreased taste (P < 0.05). Shrimp dried for 8 h had the highest content of omega-3 fatty acids. The higher oxidation of polyunsaturated fatty acids occurred when drying time increased. The TI index was between 0.044 and 0.052 and the highest index was for those dried for 2, 12, and 14 h. Shrimp died for 2 h showed the lower gap between muscle fibers and a similar microstructure was observed at 4 h of drying. After 6 h of drying, the gap was increased to some extent while with further increase of drying time (8 to 14 h) considerable texture changes were observed with large gap among muscle fibers.

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To control the excess oil uptake and avoid the health problems associated with consumption of foods with unsafe amount of oil, some additives have been used. The aim of this study was to evaluate the effect of carboxymethyl cellulose (CMC) on oil uptake and quality of bighead carp (Hypophthalmichthys nobilis) nuggets. Twenty-seven treatments with a 3×3 factorial design was used to optimize CMC at 0.25, 0.5 and 0.75% in meat, 0.25, 0.5 and 0.75% in batter and 25, 50 and 75% in pre-dust wheat flour and coating medium. All nuggets were subjected to deep-frying at 180 ºC for 3 min. some parameters in deep-fried nuggets were measured. The oil uptake after pre frying ranged from 2.86 (treatment 5) to 0.99 (treatment 18) indicating moisture loss in some samples. Shrinkage was affected by formulation and formulation × coating medium. Also, results indicated no difference in surface oil among samples (p > 0.05). However, the amount of absorbed oil was significantly different among nuggets. Nuggets produced using 0.75% CMC showed the highest moisture content (p < 0.05). Coating layer stickiness ranged from 87.73 to 65.06% and with the exception of wheat flour, the effect of all variables and their interactions significantly influenced stickiness (p < 0.05). Therefore, the use of CMC at 0.75% in product formulation, 0.75% in coating medium and 0.25% in wheat flour could be a promising process for lowering oil uptake and improving quality of experimental nuggets.