Increasing fishery product shelf‐life is the main concern regarding aquatic productions. The aim of this study was to examine the effect of saffron nano‐emulsion on shelf‐life of shrimp using two methods of spontaneous emulsification (SP) and ultrasonic homogenization (US). Shrimps were divided into three groups. In each group, saffron was either 3.0% or 5.0%, produced either through US or SP methods and kept at 4°C or 8°C. Antimicrobial activity, oxidative activity, and pH of samples were evaluated. US/3% nano‐emulsions showed the highest antimicrobial activity. The lowest pH values were observed in US/5%/4°C and SP/5%/4°C. All treatments on days 7 and 14 had pH value of 8 ± 0.008. PV increased in all the subgroups. The amount of peroxide in samples treated by 5% emulsion decreased. TBA value showed the same trend as PV. The results demonstrated that 5% saffron nano‐emulsion produced by US method manifested better protective effects. Practical applications As seafood products could be considered as a valid meat alternative, maintaining the quality of aquatic products through extending the product shelf‐life would be critical and necessary for meeting the consumer health concerns. In this study, the protective effects of saffron nano‐emulsion provided by two methods of spontaneous emulsification (SP) and ultrasonic homogenization (US) on shrimps and their shelf‐life enhancement were studied.

Marine oil spills can cause serious damage to the marine ecological environment. In the numerical modeling of oil plume rising and its advection, a better understanding of the oil plume transport may be effective on the sea pollution reduction and removing pollutants. In this paper, the effects of waves are investigated on the oil plume convection-diffusion pattern using smoothed particle hydrodynamics (SPH). Firstly, the rising patterns of an oil plume of different densities are simulated and the results are compared with the analytical solution. Then, the concentration distribution is shown for the oil plume rising problem. Afterwards, the suitability of the SPH method is examined by a cnoidal wave on shore effect. Finally, the plume of different conditions is located in waves and the advection of pollutant is studied with a fixed boom and different angles. It will be concluded that using a boom with a zero diversion angle would lead to minimum passing pollutant.

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