Canned fish canned tuna is used for sandwiches, 22 percent for salads, and 15 percent for casseroles and dried, packaged meal mixes. Other fish that is canned includes cod, mackerel, herring, and pilchard (a type of sardine). Canned fish Canned fish are 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. Fish have low acidity, levels at which microbes can flourish. From a public safety point of view, foods with low acidity
USS Skipjack (SSN-585) "Skipjack" had a noise problem in her reduction gears. ASW crews were provided the sound profile of the reduction gears; in addition, "Skipjack" was required to generate a unique sound signal at all times. This was done so the ASW crews could be certain they were targeting the right submarine and not accidentally launch a simulated attack on a real Russian submarine. As a result of all these safety measures and restrictions, the ASW forces were able to locate "Skipjack" nearly 50 percent of the time. At the end 1973 "Skipjack" was transferred to the submarine base at Groton in