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The water activity, a w, in a fish is defined as the ratio of the water vapour pressure in the flesh of the fish to the vapour pressure of pure water at the same temperature and pressure. It ranges between 0 and 1, and is a parameter that measures how available the water is in the flesh of the fish.
Because curing increases the solute concentration in the food and hence decreases its water potential, the food becomes inhospitable for the microbe growth that causes food spoilage. Curing can be traced back to antiquity, and was the primary method of preserving meat and fish until the late 19th century.
Removal of water and addition of salt to fish creates a solute-rich environment where osmotic pressure draws water out of microorganisms, retarding their growth. [5] [6] Doing this requires a concentration of salt of nearly 20%. [6] Iodized table salt may be used, but the iodine generally causes a dark end product and a bitter taste.
Fish barn with fish drying in the sun – Van Gogh 1882. Fresh fish rapidly deteriorates unless some way can be found to preserve it. Drying is a method of food preservation that works by removing water from the food, which inhibits the growth of microorganisms. Open air drying using sun and wind has been practiced since ancient times to ...
Sea salt being added to raw ham to make prosciutto. Salting is the preservation of food with dry edible salt. [1] It is related to pickling in general and more specifically to brining also known as fermenting (preparing food with brine, that is, salty water) and is one form of curing.
Canned or tinned fish are food fish which have been processed, sealed in an airtight container such as a sealed tin can, and subjected to heat. Canning is a method of preserving food , and provides a typical shelf life ranging from one to five years.
This is Qatar's first offshore fish farm.It uses floating cages technology to produce 2,000 tonnes of fish annually.But its owners are hoping to double that number by expanding the project - in ...
a fermented paste made of either fish or shrimp, commonly used as a seasoning or sauce in Burmese cuisine: Ngari Manipur, India Ngari is a traditional fermented food of Manipur. It is prepared by fermenting smaller freshwater fishes with mustard oil and salt. The dried fish are then tightly packed them in a big clay urn which is made airtight.