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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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Bob4Bass Tungsten Swing Jig 3/8 1/2 3/4 1oz w/3/0 Hook 3 in a PackBob4Bass Tungsten Swing Jig 3/8 1/2 3/4 1oz w/3/0 Hook 3 in a Pack $7.99 to $14.29 Rio InTouch Skagit iMow Medium Tip Size 10' - 5' Intermediate /5' T-11Rio InTouch Skagit iMow Medium Tip Size 10' - 5' Intermediate /5' T-11 $24.99
Worden's Timber Tiger Deflector Crankbait Fishing Lure Dc-8 2 3/4" Usa UsedWorden's Timber Tiger Deflector Crankbait Fishing Lure Dc-8 2 3/4" Usa Used $8.99 Stamps China Taiwan Sc. 1479-82, Mnh, Paintings, Fishing in the snowStamps China Taiwan Sc. 1479-82, Mnh, Paintings, Fishing in the snow $99.00
Animal Planet Penguin Clown Fish Tree Frog 3 in 1 Jigsaw Puzzle New Sealed BoxAnimal Planet Penguin Clown Fish Tree Frog 3 in 1 Jigsaw Puzzle New Sealed Box $24.95 2 (two) Fish Tacos red/bl 11.5' Swooper #1 Feather Flags Banners2 (two) Fish Tacos red/bl 11.5' Swooper #1 Feather Flags Banners $46.99
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Norman WoundedFlash Crankbait Fishing Lure Black/Chrome TopwaterNorman WoundedFlash Crankbait Fishing Lure Black/Chrome Topwater $5.99 c.1910 Antique Store "Compliments Fish Plate": Oyer Grocery Co, Mount Bethel, Pac.1910 Antique Store "Compliments Fish Plate": Oyer Grocery Co, Mount Bethel, Pa $22.40 Was:  Previous Price $28.00
And We Also Caught a Fish (Us Import) 
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Cd NewAnd We Also Caught a Fish (Us Import) 00006000 Cd New $15.04 Country Joe & The Fish - Electric Music For The Mind And Body [Digipak] New CdCountry Joe & The Fish - Electric Music For The Mind And Body [Digipak] New Cd $15.98 List price:  Previous Price $27.99
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Led Flounder Gigging Light- 50-336W. Underwater Only. Boat.Led Flounder Gigging Light- 50-336W. Underwater Only. Boat. $100.00 to $185.00 Rio Intouch Outbound Short Size Wf8F Moss/IvoryRio Intouch Outbound Short Size Wf8F Moss/Ivory $99.99
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Buchan Scotland Baking/Serving Dish Brittany M6-154 Handpainted Fish & VeggiesBuchan Scotland Baking/Serving Dish Brittany M6-154 Handpainted Fish & Veggies $16.00 Daiwa #600H Nice With Power CrankDaiwa #600H Nice With Power Crank $50.00
Unmarked Crankbait Fishing Lure Chrome Red Gills 1 1/2"Unmarked Crankbait Fishing Lure Chrome Red Gills 1 1/2" $5.99 Keep Calm and Fish Fishing Fisherman Rod Tackle Andgler Reel T shirtKeep Calm and Fish Fishing Fisherman Rod Tackle Andgler Reel T shirt $14.99
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925 Sterling Silver Antiqued Tropical Fish Polished Open-back Charm Pendant925 Sterling Silver Antiqued Tropical Fish Polished Open-back Charm Pendant $10.48 10Pcs Luminous Rubber Eel Fishing Lures Worm Bass Crank Bait Outdoor Charm10Pcs Luminous Rubber Eel Fishing Lures Worm Bass Crank Bait Outdoor Charm $6.65
Rio InTouch Skagit Imow Heavy Tip Size 10' IntermediateRio InTouch Skagit Imow Heavy Tip Size 10' Intermediate $24.99 1 New Old Stock Penn 714 714Z Fishing Reel Drag Spring 54-7141 New Old Stock Penn 714 714Z Fishing Reel Drag Spring 54-714 $2.96 Was:  Previous Price $3.95
Lot: 3 Fishing Spinner Bait Lures: 2 Finny Super Pros, 1 Storm Pygmy Spin 1/8 OzLot: 3 Fishing Spinner Bait Lures: 2 Finny Super Pros, 1 Storm Pygmy Spin 1/8 Oz $9.99 Rio InTouch Rio Gold Size Wf8F Moss/Gray/GoldRio InTouch Rio Gold Size Wf8F Moss/Gray/Gold $99.99
Johnson Century Spincast Fishing Reel 200 B 3 Ball BearingJohnson Century Spincast Fishing Reel 200 B 3 Ball Bearing $13.60 Lot: 2 Norman Crankbait Fishing Lures Black/Chartreuse 2""Lot: 2 Norman Crankbait Fishing Lures Black/Chartreuse 2"" $5.99
This Girl Loves Fishing With. With Her Husband Sticker - PortraitThis Girl Loves Fishing With. With Her Husband Sticker - Portrait $6.30 Vaseline Uranium Glass Angel Fancy Tail Gold Fish Figurine Art Glow (145549Vaseline Uranium Glass Angel Fancy Tail Gold Fish Figurine Art Glow (145549 $5.95
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Crappie Fly, 10 Pack, Spider Rigging Fly, Critter, Teaser, Gnat, Hand TiedCrappie Fly, 10 Pack, Spider Rigging Fly, Critter, Teaser, Gnat, Hand Tied $7.95 Vintage Lawrence No.3 Click Fishing Reel Made in U.S.A.Vintage Lawrence No.3 Click Fishing Reel Made in U.S.A. $2.55
Shakespeare Omni 040 2000 Series Spinning Reel Hi-Speed Gear Ratio 4.6:1Shakespeare Omni 040 2000 Series Spinning Reel Hi-Speed Gear Ratio 4.6:1 $20.00 Lot: 4 Crankbait Fishing Lures 2 Cordell Spots Plus a Norman Plus 1 OtherLot: 4 Crankbait Fishing Lures 2 Cordell Spots Plus a Norman Plus 1 Other $6.99
Mann's Mii-13 Crankbait Fishing Lure Fire TigerMann's Mii-13 Crankbait Fishing Lure Fire Tiger $5.99 Kohls Cares Plush Octopus Blue From The Pout Pout Fish 2013 Stuffed AnimalKohls Cares Plush Octopus Blue From The Pout Pout Fish 2013 Stuffed Animal $7.00
Fishing Magnet 330Lbs Powerful Neodymium Round Thick Eyebolt Treasure 2.36" DiaFishing Magnet 330Lbs Powerful Neodymium Round Thick Eyebolt Treasure 2.36" Dia $7.99 Vintage Original Heddon Torpedo Bullfrog Bass Fishing Lure, EucVintage Original Heddon Torpedo Bullfrog Bass Fishing Lure, Euc $19.99
Keys To The Freshwater And Anadromous Fishes Of CaliforniaKeys To The Freshwater And Anadromous Fishes Of California $1.99 Vintage Fishing ReelVintage Fishing Reel $2.55
Columbia Men’s Sz 34 Pfg Offshore™ Ii Board Short Fishing Swim Trunks Water BlueColumbia Men’s Sz 34 Pfg Offshore™ Ii Board Short Fishing Swim Trunks Water Blue $19.95 Worden's Timber Tiger Deflector Fishing Lure Fire Tiger Dc-8 2 3/4" UsaWorden's Timber Tiger Deflector Fishing Lure Fire Tiger Dc-8 2 3/4" Usa $8.99
10 New Eagle Claw Lazer Wacky Rig-O-Rings 25Pk Lwor110 New Eagle Claw Lazer Wacky Rig-O-Rings 25Pk Lwor1 $23.99 New Original Rooster Tail Spinner Box Kit 1/4Oz Free Vibric Rtbx.212.S777New Original Rooster Tail Spinner Box Kit 1/4Oz Free Vibric Rtbx.212.S777 $18.99
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1 New Old Stock Abu Matic 120 136 140 160 Fishing Reel Drive Gear 5580 Nos1 New Old Stock Abu Matic 120 136 140 160 Fishing Reel Drive Gear 5580 Nos $8.21 Was:  Previous Price $10.95 French Hook Earrings Silver-Plated 41026 (144) Earwires Fish Hook Ear WiresFrench Hook Earrings Silver-Plated 41026 (144) Earwires Fish Hook Ear Wires $5.55
2 Pair Combo Polarized Khan Sunglasses Sport Fishing Golfing Driving Glasses New2 Pair Combo Polarized Khan Sunglasses Sport Fishing Golfing Driving Glasses New $13.95 Lot: 2 Norman Crankbait Fishing Lures Chartreuse Orange 2 5/8"Lot: 2 Norman Crankbait Fishing Lures Chartreuse Orange 2 5/8" $7.99
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Women Outdoor Sun Hat Fishing Hiking Hat Face Neck Flap Protect Summer Upf 50+Women Outdoor Sun Hat Fishing Hiking Hat Face Neck Flap Protect Summer Upf 50+ $15.10 Lot: 2 Norman Crankbait Fishing Lures Sunshine Gelcote Green/Chartreuse 2 5/8"Lot: 2 Norman Crankbait Fishing Lures Sunshine Gelcote Green/Chartreuse 2 5/8" $8.99
Unbranded Crankbait Fishing Lure Tan/Orange 1 5/8"Unbranded Crankbait Fishing Lure Tan/Orange 1 5/8" $5.99 Worden's Timber Tiger Deflector Fishing Lure Bluegreen Back Dc-8 2 3/4" UsaWorden's Timber Tiger Deflector Fishing Lure Bluegreen Back Dc-8 2 3/4" Usa $8.99
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Hammer Chattterbait Evergreen Brett Hite Bladed Swim Sequin Lead Hook PracticalHammer Chattterbait Evergreen Brett Hite Bladed Swim Sequin Lead Hook Practical $6.97 Squeezable Applicator Jar - Fly and Jig Tying Tool Lacquer, Fly FinishSqueezable Applicator Jar - Fly and Jig Tying Tool Lacquer, Fly Finish $3.99
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Rio Intouch Outbound Short Size Wf10F/I Gray/Ivory/GreenRio Intouch Outbound Short Size Wf10F/I Gray/Ivory/Green $99.99 Homasy 400Gph Submersible Pump 25W Fountain Water Pump with For Aquarium, Fish THomasy 400Gph Submersible Pump 25W Fountain Water Pump with For Aquarium, Fish T $9.99
Rio InTouch Skagit iMow Medium Tip Size 10' IntermediateRio InTouch Skagit iMow Medium Tip Size 10' Intermediate $24.99 1948 France Morocco Solidarity Mint Never Hinged Stamps Fishing Wheat Marrakesh1948 France Morocco Solidarity Mint Never Hinged Stamps Fishing Wheat Marrakesh $9.46
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Rio InTouch Midge Tip Long Size Wf5F/I Camo Tip/MelonRio InTouch Midge Tip Long Size Wf5F/I Camo Tip/Melon $99.99 "Haski Aqua-Stop" Waterproof Fishing Hunting Winter Ice Boots Mens Shoes Pvc"Haski Aqua-Stop" Waterproof Fishing Hunting Winter Ice Boots Mens Shoes Pvc $70.99
Worden's Timber Tiger Crankbait Fishing Lure Bluegreen Back Dc-4 2 5/8" UsaWorden's Timber Tiger Crankbait Fishing Lure Bluegreen Back Dc-4 2 5/8" Usa $8.99 2 (two) Fish & Chips 11.5' Swooper #1 Feather Flags Banners2 (two) Fish & Chips 11.5' Swooper #1 Feather Flags Banners $46.99
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1956 Pennsylvania Pa State Residents Citizens Fishing License Pin Button Fish1956 Pennsylvania Pa State Residents Citizens Fishing License Pin Button Fish $19.88 Rio InTouch Skagit Imow Heavy Tip Size Intermediate 5'Int/5'T14Rio InTouch Skagit Imow Heavy Tip Size Intermediate 5'Int/5'T14 $24.99
Jig Fishing Lure Metal Green 2"Jig Fishing Lure Metal Green 2" $5.99 Fishing Lure Multi Jointed 4 Segment Swim-bait Lifelike Hard Bait Crank-bait LotFishing Lure Multi Jointed 4 Segment Swim-bait Lifelike Hard Bait Crank-bait Lot $11.39 to $37.04 Was:  Previous Price $11.99
Rio InTouch Level T Size T-11 30Ft 7-8" ipsRio InTouch Level T Size T-11 30Ft 7-8" ips $39.99 10 Packs Size #12 Sabiki Bait Rigs 6 Hook With Red Feather Saltwater Lures - 48610 Packs Size #12 Sabiki Bait Rigs 6 Hook With Red Feather Saltwater Lures - 486 $11.99
10Pcs Luminous Rubber Eel Fishing Lures Worm Bass Crank Bait Outdoor Grateful10Pcs Luminous Rubber Eel Fishing Lures Worm Bass Crank Bait Outdoor Grateful $6.65 Lot: 2 Mann's M35 & M79 Crankbait Fishing Lures Sparkly Blue/Silver/OrangeLot: 2 Mann's M35 & M79 Crankbait Fishing Lures Sparkly Blue/Silver/Orange $5.99
New Clam Ice Fishing Jig Box Small 8426New Clam Ice Fishing Jig Box Small 8426 $18.99 California Sharks And Rays, Fish Bulletin No. 75.California Sharks And Rays, Fish Bulletin No. 75. $2.99
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Prices current as of last update, 05/24/19 9:01pm.

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