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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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Monet 20.5" Faux Pearl Necklace Champagne Color Knotted Gold Fish ClaspMonet 20.5" Faux Pearl Necklace Champagne Color Knotted Gold Fish Clasp $10.25 Cactus Dust 6 Ounce Everglades Seasoning Mesquite Bbq Smoking Spice 6oz FishCactus Dust 6 Ounce Everglades Seasoning Mesquite Bbq Smoking Spice 6oz Fish $11.12 Was: Previous Price $15.44
Floating Glass Fishes Three PackFloating Glass Fishes Three Pack $16.70 Carved Flying Fish Natural Red Malachite Gemstone Pendant Bead 46X30X9MmCarved Flying Fish Natural Red Malachite Gemstone Pendant Bead 46X30X9Mm $3.91
Penn Model # Cv25000 Rear Fishing Reel Housing Only ~ Parts Only ~Penn Model # Cv25000 Rear Fishing Reel Housing Only ~ Parts Only ~ $4.49 Was: Previous Price $4.99 Franklin Mint 1986 Le Cordon Bleu "Fish" Jello Mold - Made In KoreaFranklin Mint 1986 Le Cordon Bleu "Fish" Jello Mold - Made In Korea $9.95
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Boothbay Harbor, Me The Fish HatcheryBoothbay Harbor, Me The Fish Hatchery $12.49 Vintage James Heddon Sons Winona No. 105Ff Casting Deep Trolling Fishing ReelVintage James Heddon Sons Winona No. 105Ff Casting Deep Trolling Fishing Reel $19.99
10 Irideus 9 ft 2X Fluorotech Knotless Tapered Fly Fishing Line Leaders Trout10 Irideus 9 ft 2X Fluorotech Knotless Tapered Fly Fishing Line Leaders Trout $15.99 3 Pk Awesome Bass Jigs! Custom Made Bass Fishing Jigs! 1/4, 3/8, 1/2oz.3 Pk Awesome Bass Jigs! Custom Made Bass Fishing Jigs! 1/4, 3/8, 1/2oz. $13.50
Santa Rosa, Nm - Blue Hole Lake At Fish Hatchery PostcardSanta Rosa, Nm - Blue Hole Lake At Fish Hatchery Postcard $3.50 Huntington 0-Hpfs Drone Spoon Hot Pink Flash Scale Fishing LureHuntington 0-Hpfs Drone Spoon Hot Pink Flash Scale Fishing Lure $9.05
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Johnson Sabra Model130-A Closed Faced Fishing Reel Works FineJohnson Sabra Model130-A Closed Faced Fishing Reel Works Fine $21.00 KastKing SuperPower Braid Fishing Line, Multi-color, 15Lb/0.14mm/(1000M/1094KastKing SuperPower Braid Fishing Line, Multi-color, 15Lb/0.14mm/(1000M/1094 $47.95
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Zoom 125-284 Fluke Stick 6.25 Green Pumpkin Magic 10 Pack Fishing LureZoom 125-284 Fluke Stick 6.25 Green Pumpkin Magic 10 Pack Fishing Lure $6.87 M.C.Escher / Acme Studios 80's-90's / birds and fish / black and white enamelM.C.Escher / Acme Studios 80's-90's / birds and fish / black and white enamel $44.95
17X12X6Mm Natural Fish Scale Jasper Gems Nugget Beads Strand(1 Strand) 7 7/8"17X12X6Mm Natural Fish Scale Jasper Gems Nugget Beads Strand(1 Strand) 7 7/8" $2.92 The Big Book of Fish & Shellfish: More Than 250 Terrific Recipes (Big Book (ChroThe Big Book of Fish & Shellfish: More Than 250 Terrific Recipes (Big Book (Chro $3.99
Freshwater Fishing Secrets (Complete Angler's Library)Freshwater Fishing Secrets (Complete Angler's Library) $3.99 Cabelas Lsleeve Outdoor Casual Bass Edge Fishing Large Unique EucCabelas Lsleeve Outdoor Casual Bass Edge Fishing Large Unique Euc $12.00
New Electronic Fishing Bite Sound Alarm Led Light Alert Bell Band On Fishing RodNew Electronic Fishing Bite Sound Alarm Led Light Alert Bell Band On Fishing Rod $4.99 Bamboo Flexible Working Glove Women Man for Gardening Fishing Medium Size 1 PackBamboo Flexible Working Glove Women Man for Gardening Fishing Medium Size 1 Pack $11.69
Gymboree Baby Boy Shirt T-shirt Tee Daddy's Fishing Buddy Fish Sz 6 - 12 monthsGymboree Baby Boy Shirt T-shirt Tee Daddy's Fishing Buddy Fish Sz 6 - 12 months $5.00 Fossil Fish Knightia eocaena Group Green river Fm. Kes125Fossil Fish Knightia eocaena Group Green river Fm. Kes125 $16.00
50 Vmc 7262 7262Rbn Ringed Tuna Tamer Live Bait Black Fish Fishing Hooks 5/050 Vmc 7262 7262Rbn Ringed Tuna Tamer Live Bait Black Fish Fishing Hooks 5/0 $27.99 New Pink Fishing Pole Rod & Reel Combo Slingshot Spincast Woman's Metal GearsNew Pink Fishing Pole Rod & Reel Combo Slingshot Spincast Woman's Metal Gears $16.54
Jerry Garcia Vintage Slim Cotton Fish TieJerry Garcia Vintage Slim Cotton Fish Tie $15.00 Turtle Earrings Set of 3 Tiny Small Stud .4" Sea Horse Fish Shell Gold OceanTurtle Earrings Set of 3 Tiny Small Stud .4" Sea Horse Fish Shell Gold Ocean $12.99
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Columbia Pfg Shirt Mens Sz L Pink Omni-Shade Vented Fishing Button Front EucColumbia Pfg Shirt Mens Sz L Pink Omni-Shade Vented Fishing Button Front Euc $7.99 Marycrafts Translucent Right Side Decoration Fish Bone Buffalo Horn 5 Prongs ToyMarycrafts Translucent Right Side Decoration Fish Bone Buffalo Horn 5 Prongs Toy $30.51
Tactical Anglers Power Clips Paperclip Fishing Lure Fast Snap 10 per pack 75 lbTactical Anglers Power Clips Paperclip Fishing Lure Fast Snap 10 per pack 75 lb $7.49 Vintage lot 11 Harding's Fur-Fish-Game Magazines 1970 and 1971Vintage lot 11 Harding's Fur-Fish-Game Magazines 1970 and 1971 $6.50
Fly Fishing 5X7 Horizontal Picture Frame, New, Free ShippingFly Fishing 5X7 Horizontal Picture Frame, New, Free Shipping $25.66 Mixed Fishing LotMixed Fishing Lot $6.99
Exofficio Nylon/Poly Roll-up Sleeves Vented Back/Sides Fishing 2Xl Shirt EucExofficio Nylon/Poly Roll-up Sleeves Vented Back/Sides Fishing 2Xl Shirt Euc $25.00 Lightweight Portable Folding Picnic Chair Stool Outdoor Camping Fishing HikingLightweight Portable Folding Picnic Chair Stool Outdoor Camping Fishing Hiking $24.61
Shark Fishing Leader / Rig 275 lb Ss cable w/10/0 Hook Saltwater Tackle GearShark Fishing Leader / Rig 275 lb Ss cable w/10/0 Hook Saltwater Tackle Gear $9.99 2x Premium 3D Fish & Fishing Reel Licee Frame Cover-High Quality Metal-19154-192x Premium 3D Fish & Fishing Reel Licee Frame Cover-High Quality Metal-19154-19 $55.90
(12) Awesome Deer Hair Fishing Jigs 1/16,1/8,1/4 Trout,bass,panfish(12) Awesome Deer Hair Fishing Jigs 1/16,1/8,1/4 Trout,bass,panfish $19.99 got catfish? funny window sticker decal fishing noodlinggot catfish? funny window sticker decal fishing noodling $2.69
Cruiser Accessories 19783 Black Chrome/Chrome Fishing License Plate Frame | C-19Cruiser Accessories 19783 Black Chrome/Chrome Fishing License Plate Frame | C-19 $21.90 Nrs Kicker Remix Wetshoe Mens Size 8 Paddling Rafting Fishing Tubing Worn Once!Nrs Kicker Remix Wetshoe Mens Size 8 Paddling Rafting Fishing Tubing Worn Once! $14.99
Fisherman's Fishing Sun Cap - Navy S/MFisherman's Fishing Sun Cap - Navy S/M $11.25 Shurhold 60" Fixed Length Handle - Fishing Series - 760FsShurhold 60" Fixed Length Handle - Fishing Series - 760Fs $53.99 List price: Previous Price $59.99
Colorful Fishing Deco Mesh Lake Beach Or Marina Wreath Fathers Day GiftColorful Fishing Deco Mesh Lake Beach Or Marina Wreath Fathers Day Gift $89.99 Sushi Makeup Bag Pouch Japan Food Sashimi Fish SeafoodSushi Makeup Bag Pouch Japan Food Sashimi Fish Seafood $10.00
Hook-Eze 3 x Twin Packs New Larger Model Reef & Blue Water Safe Fishing HookHook-Eze 3 x Twin Packs New Larger Model Reef & Blue Water Safe Fishing Hook $55.28 100 Matzuo 113010 Black Up Eye Octopus Fish Fishing Hooks size 6/0100 Matzuo 113010 Black Up Eye Octopus Fish Fishing Hooks size 6/0 $17.99
Fenton 5193 Cn Amethyst Carnival 5" Fish Paperweight 1972 VintageFenton 5193 Cn Amethyst Carnival 5" Fish Paperweight 1972 Vintage $68.93 elf Danzig Free City Poland 5 Pfennig 1932 Turbot Fishelf Danzig Free City Poland 5 Pfennig 1932 Turbot Fish $22.50
Van Gogh Fishing Boats on the Beach 1888 - Art Print Framed under GlassVan Gogh Fishing Boats on the Beach 1888 - Art Print Framed under Glass $75.00 Ice Fishing: A Complete Guide, Basic to AdvancedIce Fishing: A Complete Guide, Basic to Advanced $4.18
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Lego - Minifig, Utensil Fishing Rod 12L - BlackLego - Minifig, Utensil Fishing Rod 12L - Black $5.95 Vintage Pair U20 Helin Tackle Flatfish Fishing Lures w Box and Papers c. 1940Vintage Pair U20 Helin Tackle Flatfish Fishing Lures w Box and Papers c. 1940 $21.99
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Baby Gund - My First Tackle Box - 5 Piece Fishing PlaysetBaby Gund - My First Tackle Box - 5 Piece Fishing Playset $24.00 Art Glass Pelican With Fish Figurine Paperweight 7" Tall (Le)Art Glass Pelican With Fish Figurine Paperweight 7" Tall (Le) $35.99
Rapala Pro Bass Fishing 2010 - Psp Playstation Portable Complete Cib w/ Box, MRapala Pro Bass Fishing 2010 - Psp Playstation Portable Complete Cib w/ Box, M $15.72 Heddon Spit'n Image Fishing Lure Threadfin Shad 3 1/4-Inch, 7/16 ounceHeddon Spit'n Image Fishing Lure Threadfin Shad 3 1/4-Inch, 7/16 ounce $10.27
Come and Fish (Sporting Scene series) (Michael Shephard - 1952) (Id:17939)Come and Fish (Sporting Scene series) (Michael Shephard - 1952) (Id:17939) $12.00 Hand Painted Dish Shaped Like A Fish Made In Italy Multi ColorHand Painted Dish Shaped Like A Fish Made In Italy Multi Color $14.99
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Irideus Zen Spey Rod Scandi 556 Distance Shooting Head Fly Fishing Line Loop EndIrideus Zen Spey Rod Scandi 556 Distance Shooting Head Fly Fishing Line Loop End $19.84 S
00004000
himano fishing reel repair partsS 00004000 himano fishing reel repair parts $12.99
Vintage 1953 National Better Fishing Inc 12 week journal for youths NewVintage 1953 National Better Fishing Inc 12 week journal for youths New $17.99 $64.99 Was: Previous Price $99.99
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Vintage Wisconsin Fishing Regulations 1977 BookletVintage Wisconsin Fishing Regulations 1977 Booklet $8.98 Under Armour Mens Bass Fishing Shirt Ss Size Medium GreenUnder Armour Mens Bass Fishing Shirt Ss Size Medium Green $8.99
4Pc. Aquarium Basket Feeder Fish Food Live Worm Bloodworm Cone Feed -Usa Seller-4Pc. Aquarium Basket Feeder Fish Food Live Worm Bloodworm Cone Feed -Usa Seller- $6.49 Fishing Cap Neck Face Flap Fashion Summer Outdoor Sun Protection hat Men huntingFishing Cap Neck Face Flap Fashion Summer Outdoor Sun Protection hat Men hunting $19.01 Trending at $19.98
Vintage Modernist Artisan Lee Peck Mixed Metals Reticulated Figural Fish PendantVintage Modernist Artisan Lee Peck Mixed Metals Reticulated Figural Fish Pendant $9.99 Unfair Lures Stickminno 100 Floating unfair perch Fishing LuresUnfair Lures Stickminno 100 Floating unfair perch Fishing Lures $8.39 Was: Previous Price $11.99
Fishing Junk Trading Card Modern Chinese Vessel.Fishing Junk Trading Card Modern Chinese Vessel. $2.99 Puffer Fish Sticker Decal For MacBook Pro, Pc, Laptop, Window, Car, Or WallPuffer Fish Sticker Decal For MacBook Pro, Pc, Laptop, Window, Car, Or Wall $16.98
KastKing SuperPower Braid Fishing Line, Moss Green, 40Lb/0.30mm/(1000M/1094 Yds)KastKing SuperPower Braid Fishing Line, Moss Green, 40Lb/0.30mm/(1000M/1094 Yds) $46.95 Reaction Ts-036 Trixie Shark Gold Digger Fishing LureReaction Ts-036 Trixie Shark Gold Digger Fishing Lure $8.37
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