4. Conclusion
Physical properties and microbiological quality of the imported frozen shrimp differed according to the type of product, processing method (block or IQF frozen), application of the good manufacture and hygienic practices during processing. The imported block broken peeled frozen shrimp product had the lower microbiological quality comparing with other frozen products. The muscles of shrimp after peeling, head and vein removing, especially of small size ones, are more prone to invasion by microorganisms particularly when the satisfactory hygienic quality is absent. The recent results of Dechamma et al. (2015) showed that addition of B-glucan to shrimp feed enhances its immunity against microbial infection particularly Vibrio harveyi.