History of seafood Various foods depicted in an Egyptian burial chamber, including fish, c. The harvesting, processing, and consuming of seafoods are ancient practices with archaeological evidence dating back well into the Paleolithic. During this period, most people lived a hunter-gatherer lifestyle and were, of necessity, constantly on the move. However, where there are early examples of permanent settlements though not necessarily permanently occupied such as those at Lepenski Vir , they are almost always associated with fishing as a major source of food. The ancient river Nile was full of fish; fresh and dried fish were a staple food for much of the population. Some representations hint at fishing being pursued as a pastime.
The first ancestors of fish may have kept the larval form into adulthood as some sea squirts do today , although this path cannot be proven. Vertebrates , among them the first fishes , originated about million years ago during the Cambrian explosion , which saw the rise in organism diversity. Pikaia had a primitive notochord , a structure that could have developed into a vertebral column later. Unlike the other fauna that dominated the Cambrian, these groups had the basic vertebrate body plan:
How radiometric dating works in general: Radioactive elements decay gradually into other elements. The original element is called the parent, and the result of the decay process is .
See Article History Alternative Title: In a more general sense, a carnivore is any animal or plant; see carnivorous plant that eats other animals, as opposed to a herbivore , which eats plants. Although the species classified in this order are basically meat eaters, a substantial number of them, especially among bears and members of the raccoon family, also feed extensively on vegetation and are thus actually omnivorous. Canidae dogs and related species , Felidae cats , Ursidae bear s , Procyonidae raccoon s and related species , Mustelidae weasel s, badger s, otter s, and related species , Mephitidae skunk s and stink badgers , Herpestidae mongoose s , Viverridae civet s, genet s, and related species , and Hyaenidae hyena s.
There are three aquatic families: Otariidae sea lion s and fur seal s , Phocidae true, or earless, seal s , and Odobenidae the walrus. These aquatic families are referred to as pinniped s. Lions Panthera leo engaging in various activities such as hunting, eating, grooming, and sleeping. Importance of Carnivora Two carnivores are probably the animals most familiar to people: On the other hand, various bears, felines, canines, and hyenas are among the few animals that occasionally attack humans.
These large, dangerous carnivores are often the objects of hunters, who kill them for display as trophies.
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Fish may have evolved from an animal similar to a coral-like sea squirt (a tunicate), whose larvae resemble early fish in important first ancestors of fish may have kept the larval form into adulthood (as some sea squirts do today), although this path cannot be proven.. Vertebrates, among them the first fishes, originated about million years ago during the Cambrian explosion.
See Article History Alternative Titles: It is bordered by Ukraine to the north, Russia to the northeast, Georgia to the east, Turkey to the south, and Bulgaria and Romania to the west. The Crimean Peninsula thrusts into the Black Sea from the north, and just to its east the narrow Kerch Strait links the sea to the smaller Sea of Azov. The Black Sea coastline is otherwise fairly regular. The maximum east-west extent of the sea is about miles 1, km , and the shortest distance between the tip of Crimea and Cape Kerempe to the south is about miles km.
The surface area, excluding the Sea of Marmara but including the Sea of Azov, is about , square miles , square km ; the Black Sea proper occupies about , square miles , square km. A maximum depth of more than 7, feet 2, metres is reached in the south-central sector of the sea. To scientists, the Black Sea is a remarkable feature because its lower levels are, to all intents and purposes, almost biologically dead—not because of pollution but because of continued weak ventilation of the deep layers.
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Carnivore: Carnivore, any member of the mammalian order Carnivora (literally, “flesh devourers” in Latin), comprising more than species. In a more general sense, a carnivore is any animal (or plant; see carnivorous plant) that eats other animals, as opposed to a herbivore, which eats plants. Although the.
See Article History Alternative Title: In a more general sense, a carnivore is any animal or plant; see carnivorous plant that eats other animals, as opposed to a herbivore , which eats plants. Although the species classified in this order are basically meat eaters, a substantial number of them, especially among bears and members of the raccoon family, also feed extensively on vegetation and are thus actually omnivorous. The order Carnivora includes 12 families, 9 of which live on land: Canidae dogs and related species , Felidae cats , Ursidae bear s , Procyonidae raccoon s and related species , Mustelidae weasel s, badger s, otter s, and related species , Mephitidae skunk s and stink badgers , Herpestidae mongoose s , Viverridae civet s, genet s, and related species , and Hyaenidae hyena s.
There are three aquatic families: Otariidae sea lion s and fur seal s , Phocidae true, or earless, seal s , and Odobenidae the walrus. These aquatic families are referred to as pinniped s. Lions Panthera leo engaging in various activities such as hunting, eating, grooming, and sleeping.
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Black Sea: Black Sea, large inland sea situated at the southeastern extremity of Europe. The roughly oval-shaped sea is connected to the distant waters of the Atlantic Ocean by the Bosporus, the Sea of Marmara, the Dardanelles, the Aegean Sea, and the Mediterranean Sea. Learn more about the Black Sea in this article.
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Ugly catch: Mystery ‘armour fish’ caught in South China Sea stuns experts
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A surge of parasitic sea lice is disrupting salmon farms around the world. The tiny lice attach themselves to salmon and feed on them, killing or rendering them unsuitable for dinner tables. Meanwhile, wholesale prices of salmon are way up, as high as 50 percent last year. That means higher consumer prices for everything from salmon fillets and steaks to more expensive lox on bagels.
The lice are actually tiny crustaceans that have infested salmon farms in the US, Canada, Scotland, Norway and Chile, major suppliers of the high-protein, heart-healthy fish. Fish set to shrink due to global warming, study finds So far it has been an uphill struggle that is a threat to a way of life in countries where salmon farming is a part of the culture.
Experts say defeating the lice will take a suite of new and established technology, including older management tools such as pesticides and newer strategies such as breeding for genetic resistance. The innovative solutions in use or development include bathing the salmon in warm water to remove lice and zapping the lice with underwater lasers.
Farmers worldwide consider sea lice the biggest threat to their industry and say the persistent problem is making the fish more expensive to consumers. The only hope is to develop new methods to control the spread of lice, which are present in the wild, but thrive in the tightly packed ocean pens for fish farming, said Shawn Robinson, a scientist with the Canadian Department of Fisheries and Oceans. The lice can grow to about the size of a pea and lay thousands of eggs in their brief lifetime.
But Atlantic salmon have held their own with sea lice in the wild for centuries, and fish farmers managed them in aquaculture environments for many years. Feeding fish a pesticide with the active ingredient of emamectin benzoate became the tool of choice to control lice, Carr said. But around , the lice appeared to become resistant to the pesticide, and they have spread globally since.