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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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6+1 Bb Spinning Fishing reel High Speed Smooth 4000 Series Gear Ratio 5.5:1 Mma6+1 Bb Spinning Fishing reel High Speed Smooth 4000 Series Gear Ratio 5.5:1 Mma $16.99 Kids Rover Muck Boots! Rvt-Mobu-Great For Hunting & Fishing! Camo!Kids Rover Muck Boots! Rvt-Mobu-Great For Hunting & Fishing! Camo! $85.00
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Lot 3 D12-10 H&H 1/2 oz Double Eye Jig Heads 10 Pack Red Fishing LureLot 3 D12-10 H&H 1/2 oz Double Eye Jig Heads 10 Pack Red Fishing Lure $21.16 Michael Palin's Personal Best Monty Python's Flying Circus Fish Slapping DanceMichael Palin's Personal Best Monty Python's Flying Circus Fish Slapping Dance $9.99
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80Pcs Fishing Rod Guide Guides Tip Set Repair Kit with Fish Box Us Stock80Pcs Fishing Rod Guide Guides Tip Set Repair Kit with Fish Box Us Stock $8.59 World Wide Sportsmen aqua blue short sleeve fishing button front shirt Sz XxlWorld Wide Sportsmen aqua blue short sleeve fishing button front shirt Sz Xxl $6.00
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Vintage Fishing For Bass Muskalonge Pike & Pan Fish Copyright 1937 First EditionVintage Fishing For Bass Muskalonge Pike & Pan Fish Copyright 1937 First Edition $19.99 Gardner Bender Ftx-15Gl Glo Fish 15 ft. Glow-in-the-Dark Fish Sticks 5 ft. In.Gardner Bender Ftx-15Gl Glo Fish 15 ft. Glow-in-the-Dark Fish Sticks 5 ft. In. $43.97
Columbia Mens Bahama Vent Camo Pfg Slip-On Leather Fishing Moccasins Boat Shoe 9Columbia Mens Bahama Vent Camo Pfg Slip-On Leather Fishing Moccasins Boat Shoe 9 $24.98 Vivian Fishing Bait Trap Cage Feeder Basket Lures Bait Fishing Accessories 5 PcsVivian Fishing Bait Trap Cage Feeder Basket Lures Bait Fishing Accessories 5 Pcs $13.57
Pro Casting Seat-Mossy Oak Max-5 Camo Fishing Boat SeatPro Casting Seat-Mossy Oak Max-5 Camo Fishing Boat Seat $31.79 # 2 Best Tube Jig Head Kit For Bass Fishing Tube Jig Heads 60 Degree Kit 1/8 oz# 2 Best Tube Jig Head Kit For Bass Fishing Tube Jig Heads 60 Degree Kit 1/8 oz $17.28
180 Shaklee OmegaGuard Softgel Natural Fish Oil Epa Dha Omega 3 Guard Supplement180 Shaklee OmegaGuard Softgel Natural Fish Oil Epa Dha Omega 3 Guard Supplement $35.00 701197 Frabill Panfish/Crappie Straight Line Reel Ice Fish Combos701197 Frabill Panfish/Crappie Straight Line Reel Ice Fish Combos $47.99 List price: Previous Price $72.89
Downstream : Reflections on Brook Trout, Fly Fishing, and the Waters of.Downstream : Reflections on Brook Trout, Fly Fishing, and the Waters of. $13.98 Rush Creek Creations Spinning 30 Fishing Rod Rack with Duo Rod Clips - LightRush Creek Creations Spinning 30 Fishing Rod Rack with Duo Rod Clips - Light $82.46
Antique bucktail fishing lureAntique bucktail fishing lure $3.00 Heddon Baby Zara Vintage Fishing Lure 3 Inch TackleHeddon Baby Zara Vintage Fishing Lure 3 Inch Tackle $6.99
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Lee Fisher Li-Ml060C5-Hv Joy Fish Monofilament Fishing Line 60Lb Hi-VisLee Fisher Li-Ml060C5-Hv Joy Fish Monofilament Fishing Line 60Lb Hi-Vis $74.41 List price: Previous Price $94.99 Louisiana shaped Red Swedish FishLouisiana shaped Red Swedish Fish $7.23
Set of 2 Wedgwood Cameo Cufflinks- Authentic Jasperware "Junk Ship & Koi Fish"Set of 2 Wedgwood Cameo Cufflinks- Authentic Jasperware "Junk Ship & Koi Fish" $34.99 Sams Fishing Carp Fishing Baiting Rig Tool Set Bait Needle Drill Puller Strin.Sams Fishing Carp Fishing Baiting Rig Tool Set Bait Needle Drill Puller Strin. $12.33
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10X Glow in the Dark Lumo Body Squid Jigs Eging Fishing Lure Japan Cloth10X Glow in the Dark Lumo Body Squid Jigs Eging Fishing Lure Japan Cloth $9.97 Berkley 1116600 Big Game Fishing Lip Grip with Measuring Tape Stainless SteelBerkley 1116600 Big Game Fishing Lip Grip with Measuring Tape Stainless Steel $31.03 List price: Previous Price $43.99
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3X Rechargeable 30000Lm Xml-T6 led fishing lamp Headlamp+Charger+18650 Battery /3X Rechargeable 30000Lm Xml-T6 led fishing lamp Headlamp+Charger+18650 Battery / $13.00 Aqueon QuietFlow Led Pro Aquarium Power Filters, Size 50 - 250GphAqueon QuietFlow Led Pro Aquarium Power Filters, Size 50 - 250Gph $31.34
Universal Motorcycle 3D Rubber Gas Tank Pad Fish Bone Protector Decal Sticker UeUniversal Motorcycle 3D Rubber Gas Tank Pad Fish Bone Protector Decal Sticker Ue $8.99 Stearns 2000013806 Comfort Fishing Life Vest Green SmallStearns 2000013806 Comfort Fishing Life Vest Green Small $40.48 List price: Previous Price $51.99
Blaze Poles Blr10 Bream Snatcher 3 Section 10' Blue/Red Fishing PoleBlaze Poles Blr10 Bream Snatcher 3 Section 10' Blue/Red Fishing Pole $20.40 List price: Previous Price $26.99 Apatner 5m 16Ft 5050 Smd Waterproof 300 Uv Ultraviolet Led Light Night FishingApatner 5m 16Ft 5050 Smd Waterproof 300 Uv Ultraviolet Led Light Night Fishing $31.83
Vintage Fisherman 3 Piece Take Apart Fishing Net with Storage PouchVintage Fisherman 3 Piece Take Apart Fishing Net with Storage Pouch $89.99 Was: Previous Price $99.99 Acurel Extreme Activated Filter Carbon Pellets for Aquariums and Ponds 23-OunceAcurel Extreme Activated Filter Carbon Pellets for Aquariums and Ponds 23-Ounce $13.05
The Ultimate Fishing Book Edited by Lee Eisenberg & DeCourcy Taylor (D 105)The Ultimate Fishing Book Edited by Lee Eisenberg & DeCourcy Taylor (D 105) $14.50 Poster Just Enjoy The Fishing Lake Mead Nevada Fish Travel Vintage Repro Free ShPoster Just Enjoy The Fishing Lake Mead Nevada Fish Travel Vintage Repro Free Sh $10.90 to $58.00
Rapala X-Rap Pop 07 Fishing lure 2.75-Inch SilverRapala X-Rap Pop 07 Fishing lure 2.75-Inch Silver $14.80 Alice Fish TambourineAlice Fish Tambourine $11.99 List price: Previous Price $13.43
Fishing Lures, Light Up Bobber, And Drift Wood Decorative Piece! Hand-Made!Fishing Lures, Light Up Bobber, And Drift Wood Decorative Piece! Hand-Made! $35.00 Bottom Fishing For Your Soul - Thomas Alan Wheeler 2011 paperback 9781619042605Bottom Fishing For Your Soul - Thomas Alan Wheeler 2011 paperback 9781619042605 $10.00
Eagle Claw 02070-005 Quick Change Walking Sinker Fishing Size 1 ozEagle Claw 02070-005 Quick Change Walking Sinker Fishing Size 1 oz $5.84 List price: Previous Price $6.99 Free Us Ship. on Any 2 Cds! Used,Mint Cd Fous De La Mer: Stars & FishesFree Us Ship. on Any 2 Cds! Used,Mint Cd Fous De La Mer: Stars & Fishes $2.98
2" Fish Metal Cookie Cutter #Na60702" Fish Metal Cookie Cutter #Na6070 $4.49 (3 Pack) Aqueon Shrimp Pellets Fish Food 6.5 Ounces each(3 Pack) Aqueon Shrimp Pellets Fish Food 6.5 Ounces each $17.66
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Bath Toy Fishing Game with Cute Spotted Fish and Fishing Rod Best Gift forBath Toy Fishing Game with Cute Spotted Fish and Fishing Rod Best Gift for $15.20 Coach Gold Tone 31 Wire "Miranda" Double Daisy Dangle Fish Hook Earrings.Coach Gold Tone 31 Wire "Miranda" Double Daisy Dangle Fish Hook Earrings. $71.99 Was: Previous Price $89.99
C-0225 Indian Couple planting seeds with buried fish Ceramic Bisque U PaintC-0225 Indian Couple planting seeds with buried fish Ceramic Bisque U Paint $10.99 Spro 6 Inch Crank Bait Fishing Lure Sticker / DecalSpro 6 Inch Crank Bait Fishing Lure Sticker / Decal $5.00
New Life Spectrum Small Fish Formula 0.5mm Sinking Salt/Fresh 50gNew Life Spectrum Small Fish Formula 0.5mm Sinking Salt/Fresh 50g $10.98 Wardley Pond Fish Flake Food with Whole Shrimp - 6ozWardley Pond Fish Flake Food with Whole Shrimp - 6oz $9.06
Lot of 3 Used Vintage Fishing ReelsLot of 3 Used Vintage Fishing Reels $20.00 Frank Zappa thing fish demosFrank Zappa thing fish demos $25.99
NetBait Fishing Senior Paca Chunk Bait Black Blue Flake 3-InchNetBait Fishing Senior Paca Chunk Bait Black Blue Flake 3-Inch $9.69 Purina AquaMax Fingerling Starter 300 Fish Food 1/16"(1.6mm) Sinking Pellet 2.Purina AquaMax Fingerling Starter 300 Fish Food 1/16"(1.6mm) Sinking Pellet 2. $12.56
Little Fish 2008 by Barrie M. Osborne; Kirk D'Amico; Liz Watts; Mario Ex-libraryLittle Fish 2008 by Barrie M. Osborne; Kirk D'Amico; Liz Watts; Mario Ex-library $4.05 Sterling Silver Fish Charm Expandable Wire Bangle Bracelet Made in UsaSterling Silver Fish Charm Expandable Wire Bangle Bracelet Made in Usa $18.04 Was: Previous Price $18.99
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Prices current as of last update, 09/19/17 11:00am.

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