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Sardines are commercially fished for a variety of uses: bait, immediate consumption, canning, drying, salting, smoking, and reduction into fish meal or fish oil. The chief use of sardines is for human consumption. Fish meal is used as animal feed, while sardine oil has many uses, including the manufacture of paint, varnish, and linoleum.
Sardine and pilchard are common names for various species of small, oily forage fish in the herring suborder Clupeoidei. [2] The term 'sardine' was first used in English during the early 15th century; a somewhat dubious etymology says it comes from the Italian island of Sardinia, around which sardines were once supposedly abundant.
Sardines have a short life-cycle, living only two or three years. Adult sardines, about two years old, mass on the Agulhas Bank where they spawn during spring and summer, releasing tens of thousands of eggs into the water. The adult sardines then make their way in hundreds of shoals towards the sub-tropical waters of the Indian Ocean. A larger ...
About 3.5% of the weight of seawater comes from dissolved salts. But just how did the salt get in there? Why is the ocean salty? Lets dive in.
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Brine rejection is a process that occurs when salty water freezes. The salts do not fit in the crystal structure of water ice, so the salt is expelled. Since the oceans are salty, this process is important in nature. Salt rejected by the forming sea ice drains into the surrounding seawater, creating saltier, denser brine.
“The most dreaded bit of ocean on the globe – and rightly so,” Alfred Lansing wrote of explorer Ernest Shackleton’s 1916 voyage across it in a small lifeboat. It is, of course, the Drake ...