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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. more...

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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).

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".

Read more at Wikipedia.org


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300 Gallon Adjustable Silent Air Pump Large Aquarium Fish Tank 4 outlet300 Gallon Adjustable Silent Air Pump Large Aquarium Fish Tank 4 outlet $23.98 christmas Moss Mini Plants Nice, Health.christmas Moss Mini Plants Nice, Health. $6.99
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Dwarf Hairgrass Bunch Eleocharis Parvula Aquatic Aquarium Plants Buy2Get1Free*Dwarf Hairgrass Bunch Eleocharis Parvula Aquatic Aquarium Plants Buy2Get1Free* $6.99 Praziquantel Powder Prazi-Power Tropical Fish, Koi, Goldfish Parasite TreatmentPraziquantel Powder Prazi-Power Tropical Fish, Koi, Goldfish Parasite Treatment $25.00 to $249.00
Heater 100W 100 Watts Aquarium Fish Tank Submersible 10 20G Freshwater SaltwaterHeater 100W 100 Watts Aquarium Fish Tank Submersible 10 20G Freshwater Saltwater $6.45 *Live Coral : Green Star Polyp Gsp Frag * Free Shipping*Live Coral : Green Star Polyp Gsp Frag * Free Shipping $22.99
8 Orange Shrimp (Neocaridina davidi) Live Freshwater Aquarium Fish8 Orange Shrimp (Neocaridina davidi) Live Freshwater Aquarium Fish $28.95 1 Portion Over 100+ Pods Amphipods Copepods Saltwater Reef Safe Live Fish Food1 Portion Over 100+ Pods Amphipods Copepods Saltwater Reef Safe Live Fish Food $12.00
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Power Filter Fish Tank Aquarium Penn Plax Cascade 300 gph 55 To 100 Gallons NewPower Filter Fish Tank Aquarium Penn Plax Cascade 300 gph 55 To 100 Gallons New $30.99 Aquarium Heater Submersible for Tropical FishAquarium Heater Submersible for Tropical Fish $6.42 to $9.93
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24Gph Air Pump Up to 20 Gallon Aquarium Fish Tank24Gph Air Pump Up to 20 Gallon Aquarium Fish Tank $6.69 Heater 500W Aquarium 500 Watts Submersible Freshwater Marine Adjustable 100GHeater 500W Aquarium 500 Watts Submersible Freshwater Marine Adjustable 100G $9.95
1 Ea Dual Aquarium Fish Tank Thermometer Temp Sticker Stick-on Fahrenheit Usa1 Ea Dual Aquarium Fish Tank Thermometer Temp Sticker Stick-on Fahrenheit Usa $1.99 100Pcs Bio Balls Filter Sponge Media Wet/Dry Aquarium Koi Fish Pond Reef 16-26mm100Pcs Bio Balls Filter Sponge Media Wet/Dry Aquarium Koi Fish Pond Reef 16-26mm $6.79 to $9.79
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6 Vallisneria Jungle Val plants Fresh Live Aquarium Plants Buy2Get1Free6 Vallisneria Jungle Val plants Fresh Live Aquarium Plants Buy2Get1Free $7.98 Live Tubifex Worms and Daphnia MagnaLive Tubifex Worms and Daphnia Magna $24.99
2 Cup Of Hornwort ( Ceratophyllum demersum) For Outdoor Ponds & Aquariums tanks2 Cup Of Hornwort ( Ceratophyllum demersum) For Outdoor Ponds & Aquariums tanks $9.98 Wardley Tropical Fish Flake Food (In Bulk)Wardley Tropical Fish Flake Food (In Bulk) $4.99 to $96.99
Micranthemum Monte Carlo Potted Carpet Compact Freshwater Live Aquarium PlantMicranthemum Monte Carlo Potted Carpet Compact Freshwater Live Aquarium Plant $13.99 Subwassertang Round Pellia Moss. Very Nice Moss, Best Deal!Subwassertang Round Pellia Moss. Very Nice Moss, Best Deal! $12.99
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50 ' Aquarium Silicone Air Line Tubing for Fish Tank Air Pump Premium Quality50 ' Aquarium Silicone Air Line Tubing for Fish Tank Air Pump Premium Quality $6.89 Aged Live Tropical White Springtails Mixed Culture - Feeder Cleaning - Free S/HAged Live Tropical White Springtails Mixed Culture - Feeder Cleaning - Free S/H $9.54 to $16.56
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25 Stems Green Cabomba live aquarium plants aquascaping planted tank easy25 Stems Green Cabomba live aquarium plants aquascaping planted tank easy $14.99 PoylpLab Reef Roids Nano Coral Food & Nutritional Supplement 30g Aquarium FishPoylpLab Reef Roids Nano Coral Food & Nutritional Supplement 30g Aquarium Fish $12.25
White Worms: Warm temperature speciesWhite Worms: Warm temperature species $13.00 Azolla (duckweed fern, fairy moss) For Koi pond and Aquariums 100 PlantsAzolla (duckweed fern, fairy moss) For Koi pond and Aquariums 100 Plants $5.00
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Seachem MetroPlexSeachem MetroPlex $8.95 to $71.45 Aquaneat® 2Pcs Aquarium Heater Electronic Temperature-ControlAquaneat® 2Pcs Aquarium Heater Electronic Temperature-Control $11.99 to $18.72
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25-500W Aquarium Heater Submersible Anti-Explosion25-500W Aquarium Heater Submersible Anti-Explosion $3.94 to $9.90 Mini External Canister Filter Table Top Nano Fresh/Salt Aquarium Sunsun 602BMini External Canister Filter Table Top Nano Fresh/Salt Aquarium Sunsun 602B $29.99
50 Ceramic Frag Plugs For Your Coral Propogation Needs50 Ceramic Frag Plugs For Your Coral Propogation Needs $7.99 New Design! 13W Uv Sterilizer Adjustable Pump Filter 150 gal Aquarium Fish TankNew Design! 13W Uv Sterilizer Adjustable Pump Filter 150 gal Aquarium Fish Tank $32.99
*Premium* Java moss fresh water aquarium live aquatic plant*Premium* Java moss fresh water aquarium live aquatic plant $4.49 to $24.99 Duckweed 500+, Buy 2 Get 1 Free- No Snail-Floating Aquarium Plants-Free Ship M-FDuckweed 500+, Buy 2 Get 1 Free- No Snail-Floating Aquarium Plants-Free Ship M-F $4.49
5 Gallon Fish Tank *Divider Only* Betta5 Gallon Fish Tank *Divider Only* Betta $13.00 6 Water Lettuce Dwarf Pistia Floating Aquarium freshwater Plants Ponds & Tanks6 Water Lettuce Dwarf Pistia Floating Aquarium freshwater Plants Ponds & Tanks $5.25
20 Grams Brine Shrimp Eggs 90% Hatch Rate (Premium Artemia Cysts) Free Shipping20 Grams Brine Shrimp Eggs 90% Hatch Rate (Premium Artemia Cysts) Free Shipping $5.65 Natural Tree Trunk Driftwood Aquarium Fish Tank Reptile Plant Wood Decor S/M UsNatural Tree Trunk Driftwood Aquarium Fish Tank Reptile Plant Wood Decor S/M Us $7.47
10 Grams Pure Levamisole Hcl Powder Fish & Aquarium De-Wormer Parasite Medicine10 Grams Pure Levamisole Hcl Powder Fish & Aquarium De-Wormer Parasite Medicine $13.99 Tropical Fish Food Flakes Aquatic Bulk Aquarium Natural Fresh Bulk Prices UsaTropical Fish Food Flakes Aquatic Bulk Aquarium Natural Fresh Bulk Prices Usa $6.49 to $469.99
6 lbs Bio Ceramic Rings in 6 Filter Media Bags for Aquarium Fish Canister Filter6 lbs Bio Ceramic Rings in 6 Filter Media Bags for Aquarium Fish Canister Filter $15.99 Seachem KanaplexSeachem Kanaplex $8.95 to $83.95
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Prices current as of last update, 10/13/19 5:57am.

See also...
Aquarium Coral, Fish
Aquarium Decorations, Fish
Aquarium Lighting, Fish
Aquarium Meters, Regulators, Fish
Aquarium Stands, Fish
Aquariums & Bowls, Fish
Cleaning & Water Treatments, Fish
Crabs, Snails & Algae Eaters, Fish
Filtration & Heating, Fish
Fish Food, Fish
Live Aquarium Plants, Fish
Live Aquarium Rock, Fish
Other Fish Supplies, Fish
Refractometers, Fish
Tropical Fish, Fish

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