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Fish

A fish is a poikilothermic (cold-blooded) water-dwelling vertebrate with gills. There are over 27,000 species of fish, making them the most diverse group of vertebrates. Taxonomically, fish are a paraphyletic group whose exact relationships are much debated; a common division is into the jawless fish (class Agnatha, 75 species including lampreys and hagfish), the cartilaginous fish (class Chondrichthyes, 800 species including sharks and rays), with the remainder classed as bony fish (class Osteichthyes). more...

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Fish come in different sizes, from the 14m (45 ft) whale shark to a 7 mm (just over 1/4 of an inch) long stout infantfish. Many types of aquatic animals named "fish", such as jellyfish and cuttlefish, are not true fish. Other sea dwelling creatures, like dolphins, are actually mammals.

Certain species of fish maintain elevated body temperatures to varying degrees. Endothermic teleosts (bony fishes) are all in the suborder Scombroidei and include the billfishes, tunas, and one species of "primitive" mackerel (Gasterochisma melampus). All sharks in the family Lamnidae – shortfin mako, long fin mako, white, porbeagle, and salmon shark – are known to have the capacity for endothermy, and evidence suggests the trait exists in family Alopiidae (thresher sharks). The degree of endothermy varies from the billfish, which warm only their eyes and brain, to bluefin tuna and porbeagle sharks who maintain body temperatures elevated in excess of 20 °C above ambient water temperatures. See also gigantothermy. Endothermy, though metabolically costly, is thought to provide advantages such as increased contractile force of muscles, higher rates of central nervous system processing, and higher rates of digestion.

Fish ecology

Fish can be found in almost all large bodies of water in salt or brackish or fresh water, at depths from just below the surface to several thousand meters. However, hyper-saline lakes like the Great Salt Lake do not support fishes. Some species of fish have been specially bred to be kept and displayed in an aquarium, and can survive in the home environment.

Catching fish for the purpose of food or sport is known as fishing. The annual yield from all fisheries worldwide is about 100 million tonnes. Overfishing is a threat to many species of fish. On May 15, 2003, the journal Nature reported that all large oceanic fish species worldwide had been so systematically over caught that fewer than 10% of 1950 levels remained. Particularly imperiled were sharks, Atlantic cod, Bluefin tuna, and Pacific sardines. The authors recommended immediate drastic cutbacks in fish catches and reservation of ocean habitats worldwide.

Note on usage: "fish" vs. "fishes"

"Fishes" is the proper English plural form of "fish" that biologists use when speaking about two or more fish species, as in "There are over 25,000 fishes in the world" (meaning that there are over 25,000 fish species in the world). When speaking of two or more individual fish organisms, then the word "fish" is used, as in "There are several million fish of the species Gadus morhua" (meaning that G. morhua comprises several million individuals). To see both in action, consider the statement "There are twelve fish in this aquarium, representing five fishes" (meaning that the aquarium contains twelve individuals, some of the same species and some of different species, for a total of five species). The usage of the two words is similar to that of the words "people" and "peoples".

Fish as food

Fishes are an important source of food in many cultures. Other water-dwelling animals such as mollusks, crustaceans, and shellfish are often called "fish" when used as food. For more details, see Fish (food).

Read more at Wikipedia.org


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Columbia Pfg Fishing Shirt Womens Large Blue Omni Shade Long Sleeve PocketsColumbia Pfg Fishing Shirt Womens Large Blue Omni Shade Long Sleeve Pockets $23.39 00004000 Was:  Previous Price $32.95 John Lennon Plastic Ono Band Shaved Fish Capitol Records Vg+ 1978John Lennon Plastic Ono Band Shaved Fish Capitol Records Vg+ 1978 $10.00
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1 New Old Stock Garcia Kingfisher Gk64 Saltwater Fishing Reel Handle 856451 New Old Stock Garcia Kingfisher Gk64 Saltwater Fishing Reel Handle 85645 $10.36 Was:  Previous Price $12.95 Fish Tank Water Outlet Multi Angle Nozzle Return Pipe Outflow Hose Durable Ys7Fish Tank Water Outlet Multi Angle Nozzle Return Pipe Outflow Hose Durable Ys7 $8.77
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Otagiri Stoneware Vintage Mug Shell Sand Dollar Star Fish Sea Ocean NauticalOtagiri Stoneware Vintage Mug Shell Sand Dollar Star Fish Sea Ocean Nautical $10.99 Vintage Sears 641276 Levelwind Reel Saltwater Conventional Fishing ReelVintage Sears 641276 Levelwind Reel Saltwater Conventional Fishing Reel $12.99
Found Color Photo E+4044 View Of Dog In Water With Fish In MouthFound Color Photo E+4044 View Of Dog In Water With Fish In Mouth $6.98 Vtg Circa 1980s Linco Fisheries Fresh Fish Centreville Ns Advertising Patch C00YVtg Circa 1980s Linco Fisheries Fresh Fish Centreville Ns Advertising Patch C00Y $6.50 Was:  Previous Price $6.99
Booms Fishing V02 Waist Rod Holder BeltBooms Fishing V02 Waist Rod Holder Belt $18.88 ag(F) Pompano Beach, Fl: Hillsboro Inlet is the home of famous Pompano Fishingag(F) Pompano Beach, Fl: Hillsboro Inlet is the home of famous Pompano Fishing $4.50
Andrea by Sadek Fish Salt & Pepper Shakers And Matching Condiment Boat.Andrea by Sadek Fish Salt & Pepper Shakers And Matching Condiment Boat. $11.00 Tetra Marine Large Saltwater Flakes 5.65oz (160g) Fish Food Marine Reef AquariumTetra Marine Large Saltwater Flakes 5.65oz (160g) Fish Food Marine Reef Aquarium $16.99 Was:  Previous Price $19.99
Scotty 1182 Mini Power Grip Plus Line ReleaseScotty 1182 Mini Power Grip Plus Line Release $23.79 2014 Wacky Packages Chrome Wacky Ads #35 Fish-Bone2014 Wacky Packages Chrome Wacky Ads #35 Fish-Bone $2.70
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Beautiful Dartmouth Devon Fish Porcelain PitcherBeautiful Dartmouth Devon Fish Porcelain Pitcher $39.99 3M Scientific Angler Air Cell Floating Fly Fishing Line, Wf6F, 82 Feet, Lt.Green3M Scientific Angler Air Cell Floating Fly Fishing Line, Wf6F, 82 Feet, Lt.Green $29.99
Finny the Fish & the Seven Waters Video Game Poster Ad Print ArtFinny the Fish & the Seven Waters Video Game Poster Ad Print Art $14.00 Disney Store Plush Finding Nemo Clown Fish Orange Large Stuffed Toy with TagDisney Store Plush Finding Nemo Clown Fish Orange Large Stuffed Toy with Tag $22.99
Vintage Large Monet Goldtone Fish Pin/Brooch Free ShippingVintage Large Monet Goldtone Fish Pin/Brooch Free Shipping $14.99 Columbia Omni-Wick Fishing Outdoor Hiking Dress Women's Size Xs Navy Blue EucColumbia Omni-Wick Fishing Outdoor Hiking Dress Women's Size Xs Navy Blue Euc $15.99
A Hard-Water World: Ice Fishing and Why We Do It by Greg BreiningA Hard-Water World: Ice Fishing and Why We Do It by Greg Breining $3.98 Vintage 1949 Shelley Winters Mirror Reflections Fish Net Hose Camera Ad PrintVintage 1949 Shelley Winters Mirror Reflections Fish Net Hose Camera Ad Print $9.50
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1979 Lew's Speed Stick And Speed Spool Fishing Reels Original Print Ad A21979 Lew's Speed Stick And Speed Spool Fishing Reels Original Print Ad A2 $8.99 Cleaning And Cooking Fish by Sylvia Bashline.( 1982 Hardback). Xlnt conditionCleaning And Cooking Fish by Sylvia Bashline.( 1982 Hardback). Xlnt condition $4.88
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Funny Stuff #54 1950- Dc Funny Animals- Dodo and Frog -fishing cover Fn-Funny Stuff #54 1950- Dc Funny Animals- Dodo and Frog -fishing cover Fn- $58.50 BeadTin 25mm Fish Plastic Pony Beads (24pcs) - Style choiceBeadTin 25mm Fish Plastic Pony Beads (24pcs) - Style choice $2.19
Magellan Men’s Sportswear Peach Vented Cargo Outdoor Fishing Shirt Sz L (B2)Magellan Men’s Sportswear Peach Vented Cargo Outdoor Fishing Shirt Sz L (B2) $12.99 Fish Hippie Mens Blue Shorts - Size 40Fish Hippie Mens Blue Shorts - Size 40 $24.99
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Natural Fossil Shank Fish ToothNatural Fossil Shank Fish Tooth $24.00 Athletic Mechanics - Ultimate Fish Oil - High Quality Non-Gmo, 800 Epa, 600 DhaAthletic Mechanics - Ultimate Fish Oil - High Quality Non-Gmo, 800 Epa, 600 Dha $12.99
4 PlayStation Cds Of Fresh Water Bass Fishing & Saltwater Fishing4 PlayStation Cds Of Fresh Water Bass Fishing & Saltwater Fishing $15.00 #2545-2549 Fishing Flies Fdc's Set of 6 Fdc's with Fleetwood Cachets Fd7876#2545-2549 Fishing Flies Fdc's Set of 6 Fdc's with Fleetwood Cachets Fd7876 $4.76 Was:  Previous Price $5.95
Hot Wheels Fast Fish Lime Green Black Pinstripe Chrome Seats clear windowsHot Wheels Fast Fish Lime Green Black Pinstripe Chrome Seats clear windows $5.99 Rock Poster, Avalon Ballroom #Fd31, 1966: Daily Flash, Country Joe & The FishRock Poster, Avalon Ballroom #Fd31, 1966: Daily Flash, Country Joe & The Fish $65.00
10L Waterproof Dry Bag Orange & Phone Case Resistant Kayak Boating Fishing10L Waterproof Dry Bag Orange & Phone Case Resistant Kayak Boating Fishing $28.54 All Night Media rubber stamp Fish wood mounted, Large, 970J12, FishingAll Night Media rubber stamp Fish wood mounted, Large, 970J12, Fishing $9.99
Vintage Tom Mann's Fishing Lures - TwoVintage Tom Mann's Fishing Lures - Two $9.99 Universal Phone Camera Lens Kit 3in1 Fish Eye Wide Angle Macro For Apple SamsungUniversal Phone Camera Lens Kit 3in1 Fish Eye Wide Angle Macro For Apple Samsung $4.25
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Ge Model 7336 Electric Alarm Clock Vintage Fish Shape General ElectricGe Model 7336 Electric Alarm Clock Vintage Fish Shape General Electric $12.00 New Fishing Art Impressions Fish Mr Ed Quote Saying Wood Mounted Rubber StampNew Fishing Art Impressions Fish Mr Ed Quote Saying Wood Mounted Rubber Stamp $9.00
Vintage 2-3/4 Inch Shakespeare Glo-Lite Pup Plastic Fishing Lure Lot C-555Vintage 2-3/4 Inch Shakespeare Glo-Lite Pup Plastic Fishing Lure Lot C-555 $6.00 1*3 Rod Rack 316 Stainless Steel Fishing Rod Holder Boat Marine Equipment Bottom1*3 Rod Rack 316 Stainless Steel Fishing Rod Holder Boat Marine Equipment Bottom $21.99 Was:  Previous Price $39.99
Used 1988 Garcia Mitchell 300A T.4, Spinning Fishing Reel - Made in FranceUsed 1988 Garcia Mitchell 300A T.4, Spinning Fishing Reel - Made in France $14.99 Nikon Sport Lite 10x25 Binoculars, Strap & Case, Excellent, Camping Fishing HuntNikon Sport Lite 10x25 Binoculars, Strap & Case, Excellent, Camping Fishing Hunt $26.00
Cannon 1904040 Mounting Base, Magnum/digitroll, LexanCannon 1904040 Mounting Base, Magnum/digitroll, Lexan $35.21 Sanilo Elongated Toilet Seat Fish FaceSanilo Elongated Toilet Seat Fish Face $20.00
Vintage Sterling Charms 1 Dozen Fish SalmonVintage Sterling Charms 1 Dozen Fish Salmon $19.99 Pa Pennsylvania Fish Game Commission New Non-Game Series 2003 Paddlefish PatchPa Pennsylvania Fish Game Commission New Non-Game Series 2003 Paddlefish Patch $5.03
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Prices current as of last update, 11/12/19 4:01pm.

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