Fish is a food consumed by many species, including humans. The word ‘’fish’’ refers to both the animals and to the food prepared from it. Fish has been an important source of protein for humans throughout recorded history. Fish are a paraphyletic group of organisms that consist of all gill-bearing aquatic vertebrate animals that lack limbs with digits. Most fish are cold-blooded, allowing their body temperatures to vary as ambient temperatures change, though some of the large active swimmers like white shark and tuna can hold a higher temperature. Fish mostly can be found in nearly all auqatic environments, from high mountain streams to the abyssal and even hadal depths of the deepest oceans. There are 32,000 species fish in the world exhibit greater species diversity then any other class of vertebrates. Fish, especially as food, are an important resource worldwide. Commercial and subsistence fishers hunt fish in wild fisheries (see fishing) or farm them in ponds or in cages in the ocean (see aquaculture). They are also caught by recreational fishers, kept as pets, raised by fish keepers, and exhibited in public aquaria. Fish have had a role in culture through the ages, serving as deities, religious symbols, and as the subjects of art, books and movies.
HISTORY OF FISH
THE MOST EXPENSIVE FISH PER POUND
Bluefin Tuna
A bluefin tuna set a new record price at Tokyo’s Tsuiji Fish Market this week. The owner of a sushi restaurant chain bid 56.49 million yen, or about $736,000 for the giant fish. At 593 pounds, that works out to about $1,238/lb. Last year’s price record for a bluefin in Japan was 32.49 million yen. The buyer said he wanted to liven things up a little after the earthquake and nuclear disaster.
Bluefin tuna is one of the largest, fastest, and most gorgeously colored of all the world’s fishes. Their torpedo-shaped, streamlined bodies are built for speed and endurance. Their coloring—metallic blue on top and shimmering silver-white