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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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Tropical Nautical Fish Metal Wind Chime Free ShippingTropical Nautical Fish Metal Wind Chime Free Shipping $19.99 Kirkland Signature and trade; Fish Oil 1000mg., 400 SoftgelsKirkland Signature and trade; Fish Oil 1000mg., 400 Softgels $20.23
Vintage Bear Holding Fish Salt And Pepper Shaker SetVintage Bear Holding Fish Salt And Pepper Shaker Set $6.00 Luhr Jensen Kwifish K14 lot of 5 pieces fishing tackle lure orange green silverLuhr Jensen Kwifish K14 lot of 5 pieces fishing tackle lure orange green silver $19.99
Abu Garcia Revo Toro 60 Hs Baitcaster Fishing Reel Rubber Sealed Bearing KitAbu Garcia Revo Toro 60 Hs Baitcaster Fishing Reel Rubber Sealed Bearing Kit $26.99 5-Led Light Cap Beanie Hat Batteries for Hunting Camping Running Fishing Us Hot5-Led Light Cap Beanie Hat Batteries for Hunting Camping Running Fishing Us Hot $6.19
Funny Fish Story Bag Red Zipper Gemline Tote Fisherman It was This Big MonogramFunny Fish Story Bag Red Zipper Gemline Tote Fisherman It was This Big Monogram $11.96 Was: Previous Price $15.95 Vintage 1992 Enchanted Workshop Merry Fishing Santa Animated Christmas DecorVintage 1992 Enchanted Workshop Merry Fishing Santa Animated Christmas Decor $12.99
South Bend Condor 510 Gear Ratio 4.8:1 Graphite Spinning Fishing ReelSouth Bend Condor 510 Gear Ratio 4.8:1 Graphite Spinning Fishing Reel $7.99 Vintage 14k Gold Miniature Jumping Salmon Fish CharmVintage 14k Gold Miniature Jumping Salmon Fish Charm $69.99
Kurt Adler Fish Christmas Ornaments Iridescent Solid Glass 2 different fishKurt Adler Fish Christmas Ornaments Iridescent Solid Glass 2 different fish $11.99 Was: Previous Price $14.99 2 pc Blown Murano Glass Fish Dangle Drape Costume Jewelry Silver Tone Necklaces2 pc Blown Murano Glass Fish Dangle Drape Costume Jewelry Silver Tone Necklaces $14.50
rikshaw design fish button up fish shirt 2trikshaw design fish button up fish shirt 2t $20.00 Vintage Fishing Lures - Wooden Rapala Floating - Countdown - Other Black & GoldVintage Fishing Lures - Wooden Rapala Floating - Countdown - Other Black & Gold $12.25
Tropical Fish Colorful Metal Wall Art Nautical Tropical Patio Home DecorTropical Fish Colorful Metal Wall Art Nautical Tropical Patio Home Decor $35.99 Fishing from the Rocks Painting by William McTaggart Art ReproductionFishing from the Rocks Painting by William McTaggart Art Reproduction $26.99 to $48.99
Bath & Body Works - Wire Gold Fish Home Decor Set of 2 NewBath & Body Works - Wire Gold Fish Home Decor Set of 2 New $48.99 10 Gallon Fish Tank Aquarium10 Gallon Fish Tank Aquarium $15.00
Fishing Lures Lot with Tackle Box,Agadget 204Pcs/Lot Fishing Tackle Hard Soft PlFishing Lures Lot with Tackle Box,Agadget 204Pcs/Lot Fishing Tackle Hard Soft Pl $31.29 Eheim Everyday Fish Feeder Programmable Automatic Food DispenserEheim Everyday Fish Feeder Programmable Automatic Food Dispenser $34.99
Early 1900s Trout Fishing on the Norwalk River, Norwalk, Ct PostcardEarly 1900s Trout Fishing on the Norwalk River, Norwalk, Ct Postcard $9.50 2.1M 6.89Ft Telescopic Fishing Rod Carbon Fiber Travel Spinning Lure Pole C0T32.1M 6.89Ft Telescopic Fishing Rod Carbon Fiber Travel Spinning Lure Pole C0T3 $10.43 to $52.51 Was: Previous Price $10.98
Waxcessories Nautical Tea Light Fishing Boat Barn NewWaxcessories Nautical Tea Light Fishing Boat Barn New $5.50 5 Led light Beanies Fishing Hunting Camping Running Caps Knitting Woolen Hat5 Led light Beanies Fishing Hunting Camping Running Caps Knitting Woolen Hat $5.99
Boy Scouts - 1969 Chief Blackhawk District Fishing Derby patchBoy Scouts - 1969 Chief Blackhawk District Fishing Derby patch $7.99 Art photo "3 Koi Fish" #001. 20" x 24" professional enlargementArt photo "3 Koi Fish" #001. 20" x 24" professional enlargement $19.99
Set of Three Mid Century Fish Glass Old-Fashioned Rocks Gold 4" tallSet of Three Mid Century Fish Glass Old-Fashioned Rocks Gold 4" tall $29.95 Universal 5in1 Clip-On Phone Telephoto Fish Eye Wide Angle Macro Lens Kit Dc777Universal 5in1 Clip-On Phone Telephoto Fish Eye Wide Angle Macro Lens Kit Dc777 $14.60
Trio of Nino Parrucca fish dishes / wall hangingsTrio of Nino Parrucca fish dishes / wall hangings $35.00 Mepps Flying C Spinner 7/8 Oz Fishing Lure Hot Pink Silver Treble Siwash HooksMepps Flying C Spinner 7/8 Oz Fishing Lure Hot Pink Silver Treble Siwash Hooks $10.50
Live Fresh Water Crayfish, 2"-3" Long Craw fish Usa Invertebrates CrawfishLive Fresh Water Crayfish, 2"-3" Long Craw fish Usa Invertebrates Crawfish $18.00 2007 Hot Wheels 178/180 2007 Mystery Cars Fish'd & Chip'd2007 Hot Wheels 178/180 2007 Mystery Cars Fish'd & Chip'd $9.99
Kuchenprofi Stainless Steel Fish ScalerKuchenprofi Stainless Steel Fish Scaler $11.95 Wooden Marlin Hanging Fish-18 inches-Made in HawaiiWooden Marlin Hanging Fish-18 inches-Made in Hawaii $39.95
12 Each ~ Magic Products Mini Mallow-Cheese Marshmallow Fishing Prepared Baits12 Each ~ Magic Products Mini Mallow-Cheese Marshmallow Fishing Prepared Baits $47.02 Was: Previous Price $49.50 Liz Claiborne fish shell butterfly gold tone charm bracelet 7"Liz Claiborne fish shell butterfly gold tone charm bracelet 7" $19.99
2-Christian Fish Car Emblems W/ self-adhesive backing2-Christian Fish Car Emblems W/ self-adhesive backing $5.75 1931 Dominon Atlantic Railway Railroad Ad Nova Scotia Fishing1931 Dominon Atlantic Railway Railroad Ad Nova Scotia Fishing $1.50
Rare Vintage Emco Fishing Tackle Box Lure Storage UsaRare Vintage Emco Fishing Tackle Box Lure Storage Usa $5.99 Fin-tech 7/32 brown lazer nuckle ball fishing jigs mustad hook qty 2Fin-tech 7/32 brown lazer nuckle ball fishing jigs mustad hook qty 2 $3.00
Fish Tape Fiberglass Wire Cable Running Rod Duct Rodder Fishtape Puller /4.5mmFish Tape Fiberglass Wire Cable Running Rod Duct Rodder Fishtape Puller /4.5mm $87.99 Purture 3Pcs Glowing Effect Artificial Coral P
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lant for Fish TankPurture 3Pcs Glowing Effect Artificial Coral P 00006000 lant for Fish Tank $9.38
Littlest Pet Shop #2352 Sparkle Puffer Fish 100% Authentic LpsLittlest Pet Shop #2352 Sparkle Puffer Fish 100% Authentic Lps $1.25 Iland Tr500F-Bl/Wh Tracker Flasher 3/4oz Blue White Fishing LureIland Tr500F-Bl/Wh Tracker Flasher 3/4oz Blue White Fishing Lure $17.12
Extinct Fossil Fish from Morocco • Phacodus punctuates Jaw Section #1Extinct Fossil Fish from Morocco • Phacodus punctuates Jaw Section #1 $32.00 Swedish Fish Large Assorted bulk candy 5 poundsSwedish Fish Large Assorted bulk candy 5 pounds $21.00
Psycho Fish Piranha with Bone Funny Cartoon Car Bumper Vinyl Sticker Decal 4"X5"Psycho Fish Piranha with Bone Funny Cartoon Car Bumper Vinyl Sticker Decal 4"X5" $2.99 (A3) Marlin Gone Fishing 3.5" x 2.5" iron on patch (4513) Cap Jacket(A3) Marlin Gone Fishing 3.5" x 2.5" iron on patch (4513) Cap Jacket $7.48
KastKing SuperPower Braid Fishing Line (1093Yds-15Lb)KastKing SuperPower Braid Fishing Line (1093Yds-15Lb) $7.50 5 Led Light Up Knit Cap Winter Warm Fishing Hat Angling Hunting Camping Running5 Led Light Up Knit Cap Winter Warm Fishing Hat Angling Hunting Camping Running $6.36
Accurate Boss Single Speed Fishing Reel Rubber Sealed Bearing KitAccurate Boss Single Speed Fishing Reel Rubber Sealed Bearing Kit $22.49 Fish Table Furniture Art Tropical Nautical Patio Tiki Bar Home DecorFish Table Furniture Art Tropical Nautical Patio Tiki Bar Home Decor $45.99
Fish Costume For 12" Doll By The Itty Bitty Toy Co.Fish Costume For 12" Doll By The Itty Bitty Toy Co. $12.99 Crab Colorful Stained Glass Metal Wall Art Tropical Patio Home Decor FishCrab Colorful Stained Glass Metal Wall Art Tropical Patio Home Decor Fish $29.99
Vintage Hartz Mountain Products Canary Care Treatise on Tropical Fish 1930s-50sVintage Hartz Mountain Products Canary Care Treatise on Tropical Fish 1930s-50s $1.99 Lot 2 Vtg Down Rigger Solid 10 Pound Lead Fish Shaped Sinker Small Boat AnchorLot 2 Vtg Down Rigger Solid 10 Pound Lead Fish Shaped Sinker Small Boat Anchor $24.99
Dated 1967 Ppc* Coffeeville Ms Fish Story Wish You Were HereDated 1967 Ppc* Coffeeville Ms Fish Story Wish You Were Here $6.28 Was: Previous Price $7.85 1957 Press Photo A Woman and Man Take Coffee Break While Fishing - nef696371957 Press Photo A Woman and Man Take Coffee Break While Fishing - nef69637 $17.88
New 5-Led Light Headlamp Cap Knit Beanie Hat for Hunting Camping Running FishingNew 5-Led Light Headlamp Cap Knit Beanie Hat for Hunting Camping Running Fishing $6.28 $15.00
Rainbow Fish: Counting : El Pez Arco Iris: NumerosRainbow Fish: Counting : El Pez Arco Iris: Numeros $13.75 Rainbow Trout Fish Pattern Fisherman Angler Fishing Camping Blue Coffee Cup MugRainbow Trout Fish Pattern Fisherman Angler Fishing Camping Blue Coffee Cup Mug $9.95
Brazilian Skewer for Bbq 28" - Professional Grade - Fish & Vegetable BasketBrazilian Skewer for Bbq 28" - Professional Grade - Fish & Vegetable Basket $85.00 Sold As-Is: Humminbird 110 Fishin Buddy Portable Fishing SystemSold As-Is: Humminbird 110 Fishin Buddy Portable Fishing System $36.08
Accurate Atd12 Fishing Reel Rubber Sealed Bearing KitAccurate Atd12 Fishing Reel Rubber Sealed Bearing Kit $31.49 2 Pairs of New Fashion Designs and Fish Hook Style Earrings2 Pairs of New Fashion Designs and Fish Hook Style Earrings $5.99
Vintage
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 Box of 100 Pflueger Cincinnati Bass Fish HooksVintage 00006000 Box of 100 Pflueger Cincinnati Bass Fish Hooks $12.95 Abu Garcia Revo Stx Baitcaster Complete Fishing Reel Rubber Sealed Bearing KitAbu Garcia Revo Stx Baitcaster Complete Fishing Reel Rubber Sealed Bearing Kit $26.99
2X Deep Sea Dropping Baiting Lure Saltwater Fishing Flash Led Halibut Flounder2X Deep Sea Dropping Baiting Lure Saltwater Fishing Flash Led Halibut Flounder $14.98 13 Fishing Concept A 8.1-1 Right Hand Baitcast Reel13 Fishing Concept A 8.1-1 Right Hand Baitcast Reel $41.00
Vintage 1/20 12Kt Gold Filled Men's Tie Clasp Bar Orange Fin Marlin FishingVintage 1/20 12Kt Gold Filled Men's Tie Clasp Bar Orange Fin Marlin Fishing $19.95 Boat Seat Adjustable Swivel Mount Universal Clamp Chair Bracket Marine FishingBoat Seat Adjustable Swivel Mount Universal Clamp Chair Bracket Marine Fishing $36.84
1955 Shakespeare Fishing Calendar - Greenfield, Ohio1955 Shakespeare Fishing Calendar - Greenfield, Ohio $10.00 Fishing At Flat Rock, Lower Pallisades, Mount Vernon, Iowa - 1919Fishing At Flat Rock, Lower Pallisades, Mount Vernon, Iowa - 1919 $7.99
Men's Remington Long Sleeve Vented Fishing Hiking Shirt Green Large 42-44Men's Remington Long Sleeve Vented Fishing Hiking Shirt Green Large 42-44 $16.76 Was: Previous Price $18.62 Accurate Boss Single Speed Spool Fishing Reel Rubber Sealed Bearing KitAccurate Boss Single Speed Spool Fishing Reel Rubber Sealed Bearing Kit $8.99
Airhead Fishing Deluxe Mesh Top Fishing Vest, Navy, 4X-Large/6X-LargeAirhead Fishing Deluxe Mesh Top Fishing Vest, Navy, 4X-Large/6X-Large $51.72 Lot of 22 New 3/8 Ounce Fishing Lures Wood Popper Topwater Plug Dark Green BassLot of 22 New 3/8 Ounce Fishing Lures Wood Popper Topwater Plug Dark Green Bass $19.95
Vintage Avon Bottle Collectible Rainbow Trout Green Glass Fish Cologne Men'sVintage Avon Bottle Collectible Rainbow Trout Green Glass Fish Cologne Men's $7.50 Solomon Islands - 2015 Fish - 9 Stamp Set - Scott #1926-34 - Slm15601aSolomon Islands - 2015 Fish - 9 Stamp Set - Scott #1926-34 - Slm15601a $50.00
Mitchell 300Pro Spinning Fishing Reel 5.8:1 10Bb 180yd/12Lb MonoMitchell 300Pro Spinning Fishing Reel 5.8:1 10Bb 180yd/12Lb Mono $69.95 Abu Garcia Revo S Spool Fishing Reel Rubber Sealed Bearing KitAbu Garcia Revo S Spool Fishing Reel Rubber Sealed Bearing Kit $8.99
Mens Camo, Lightweight, Short Sleeve, Fishing Shirt, Realtree, Mossy Oak, S-4XlMens Camo, Lightweight, Short Sleeve, Fishing Shirt, Realtree, Mossy Oak, S-4Xl $49.20 to $56.00 Fishing California Freshwater: A Travel Guide to Proven Spots & Proven MethodsFishing California Freshwater: A Travel Guide to Proven Spots & Proven Methods $5.06
Ifni - 1953 - Fish - Sponges - Jellyfish - 4X Mint - Mnh Set!Ifni - 1953 - Fish - Sponges - Jellyfish - 4X Mint - Mnh Set! $3.99 Large Trout Rubber Stamp by Great Impressions - Game Fish, FishingLarge Trout Rubber Stamp by Great Impressions - Game Fish, Fishing $10.39 Was: Previous Price $12.99
Thickest Wrap 24mil Skin L+I for Igloo Sportsman 40qt Cooler Gone FishingThickest Wrap 24mil Skin L+I for Igloo Sportsman 40qt Cooler Gone Fishing $42.95 4Pc Dk3000 5.2:1 11Bb Fishing Spinning Reel -Smart Anglers Tool Hot Sale4Pc Dk3000 5.2:1 11Bb Fishing Spinning Reel -Smart Anglers Tool Hot Sale $38.43 Was: Previous Price $40.45
Nwt Field & Stream 2Xl Xxl shirt men's hiking camping fishing outdoors NewNwt Field & Stream 2Xl Xxl shirt men's hiking camping fishing outdoors New $19.99 100 ft fish tape electrican reel pull wires cable steel hand puller tools100 ft fish tape electrican reel pull wires cable steel hand puller tools $31.90
Fc-Charms Trinkets Mens Boot Wear Chain Ankle Accessory Country Western CowboysFc-Charms Trinkets Mens Boot Wear Chain Ankle Accessory Country Western Cowboys $8.99 to $11.99 field & stream men's L short sleeve shirt fish theme sushi ocean 100% cottonfield & stream men's L short sleeve shirt fish theme sushi ocean 100% cotton $9.99
Lot of Vintage Fishing ReelsLot of Vintage Fishing Reels $65.00 Okuma Fishing Tundra 15-Foot 3-Piece Surf/Pier Spinning Rod, Large, Tu-150, ReelOkuma Fishing Tundra 15-Foot 3-Piece Surf/Pier Spinning Rod, Large, Tu-150, Reel $49.99
Vintage Handmade Wooden Fishing Lure Fish Northern Wisconsin Rl253Vintage Handmade Wooden Fishing Lure Fish Northern Wisconsin Rl253 $95.00 Northern Wisconsin Handmade Wooden Tin Fishing Lure Red White Rl254Northern Wisconsin Handmade Wooden Tin Fishing Lure Red White Rl254 $95.00
Vintage Brown Dryden Fish Pottery Plate / Tray / Dish Hard to Find Vintage Brown Dryden Fish Pottery Plate / Tray / Dish Hard to Find  $10.00 1932 Press Photo Barbara Pomeroy Shows New Fishing Pole Holders - nef695261932 Press Photo Barbara Pomeroy Shows New Fishing Pole Holders - nef69526 $17.88
Cablz Blue Monoz - Perfect For Fishing, Boating, Golfing, Running, BikingCablz Blue Monoz - Perfect For Fishing, Boating, Golfing, Running, Biking $15.50 Avet Big Game 50 Spool Fishing Reel Rubber Sealed Bearing KitAvet Big Game 50 Spool Fishing Reel Rubber Sealed Bearing Kit $8.99
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Prices current as of last update, 11/21/17 7:40pm.

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