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A fish is a water-dwelling vertebrate with gills. Most are cold-blooded. There are over 29,000 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).
Fish come in different sizes, from the 16 m (51 ft) whale shark to a 8 mm (just over ¼ 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, while closely resembling fish in outer appearance, are actually mammals.
Although most fish are exclusively aquatic and cold-blooded, there are exceptions to both cases. Fish from a number of different groups have evolved the capacity to live out of the water for extended periods of time. Of these amphibious fish some such as the mudskipper can live and move about on land for up to several days. Also, 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.
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AA Aquarium Equipment - Producing tanks, filters, pumps and accessories for Hong Kong and China.
AAT Fabrication, Inc - Custom-built acrylic aquariums and aquarium cabinets, also hoods and stands as well as acrylic products for the office and home. Located in Van Nuys, California.
All-Glass Aquarium - Manufacturers of aquariums, hoods and stands with instructions, catalog, and technical information.
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AquaC Inc - Manufacturer of marine filtration products and protein skimmers. Louisville, Kentucky.
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Aquamacs - Rental, installation and maintenance of aquariums for commercial premises across the United Kingdom, with photographs and testimonials.
Meta Description: [ We are a multiple award winning aquarium rentals and maintenance company, offering bespoke installations and servicing for any business application. ]
Aquapor - Producing aquariums, heaters, lighting, filters and accessories. Codex, Portugal.
Aquarium Lighting and Supply - Wholesaler of lighting for marine systems and aquariums.
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for lighting and all aquarium needs. ]
Aquarium Pharmaceuticals - Supplier of a water filtration pouch for fresh and saltwater aquariums.
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Aquarium Technology Inc. - Aquarium filtration products. Located in Decatur, Georgia.
Meta Description: [ PetsForum Group, Net's best source for pet & animal information. ]
Aquatic Biodiversity Group - Developing fishery management, hatchery technology and a co-operative information network about the temperate marine environment. Includes lists of available specimens. Tasmania, Australia.
Aquatica International - Wholesaler of filters and livestock, including tropical, coldwater, and ornamental fish. Surrey, England.
Meta Description: [ BubbleBead Filters, UK filter wholesaler, filter, filtration systems, fish tank filter, tropical, coldwater, koi, carp, fish, biosieve, hydro pumps, estrosieve, twinvalve, aquaculture, ornamental fish, coldwater fish ]
BRI Aquatic Cabinets - Manufacturer of glass and acrylic custom aquarium cabinets and canopies. Includes illustrated catalog and list of vendors.
Meta Description: [ Manufacturer and wholesaler of furniture grade and custom aquarium cabinets and canopies. Bow front aquarium cabinets too. ]
Caribsea, Inc. - Aragonite and sand for marine aquariums.
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Chuan Lai Enterprise Co., Ltd. - Manufacturers of aquarium supplies including tanks, filters, and carriers.
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Clearseal Aquarium Manufacturers - A United Kingdom based company that specializes in aquariums and aquarium stands. A large range of accessories are also available, such as aquarium hoods.
CPR Aquatic, Inc - Manufacturing biological filtration products as well as skimmers. Located in Arcata, California.
Meta Description: [ CPR Aquatic, manufacturers of fine marine aquarium equipment such as the Cyclone Bak-Pak. ]
CustomSeaLife, Inc. - Manufacturers of aquarium lighting fixtures.
Deyi Arts and Crafts Products Factory - Designing and producing imitation coral, aquarium decorations and artificial bonsai. Guangzhou, China.
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Dupla Aquaristik GmbH - Manufacturers of filters, heating, and aeration systems for aquariums, with information about raising salt-water fish. Bielefield, Germany.
Fritzpet - Supplying chemicals and equipment for aquariums, with maintenance tips and species database. Mesquite, Texas, USA.
Meta Description: [ Fritz Pet manufactures and distributes high quality aquarium, pond and aquaculture products. Fritz is recognized worldwide for its high quality water conditioners, nitrifying bacteria, aquarium products, and unique imported specialties. ]
Guangdong Risheng Group Co. Ltd. - Manufacturer of aquarium accessories including air pumps, heaters, internal power filters, and ornaments. China.
Guangzhou Weiao Industry Co Ltd - Manufacturer and exporter of aquarium accessories including background screen, fish food, cleaner, underwater ornaments and scrapers. Guangdong, China.
Meta Description: [ manufacturer and exporter of aquarium accessories includes background screen, fish food, fish food packing bag, fish net, water tank, facility water changer, cleaner, underwater ornaments, scrapers, pet case. ]
Hawkeye International - Designer, manufacturer and distributor of seamless acrylic plastic aquariums, filters and accessories. Based in Shawnee, Kansas.
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Hydro Logix, Inc - An aquarium maintenance company offering custom design and installation. Western Connecticut and New York City, USA
Meta Description: [ Westport Aquarium is an aquarium maintenance company specializing in custom designed aquariums. Westport Aquarium installs fresh water aquariums, natural planted aquariums, salt water fish tanks, living reef tanks, and shark tanks. Westport Aquarium services commercial and residential accounts in... ]
Jebo Co. Ltd. - An international company that develops and manufactures aquariums, accessories and submersible pumps.
National Fish Pharmaceuticals - Manufacturer with bulk sales of pharmaceuticals and chemicals for the tropical fish industry. Product list, and articles about diseases and prevention.
Meta Description: [ Fish disease diagnosis charts and quality fish medications direct from the manufacturer. Free advise from qualified experts since 1971. ]
NT Laboratories - Conducts research and produces products for the care of aquariums, ponds and pool fish, including Koi, since 1972 in East Peckham, Kent, England.
Oceanariums - Builds custom acrylic aquariums with integrated stands, hoods, and filtration. Based in Daytona Beach, Florida, USA.
Meta Description: [ Oceanariums Aquariums Manufacturer of Daytona Beach Florida creates Bubble Walls and Large Aquariums for trade show displays, offices and pet shops and Lobster Tanks for restaurants and supermarkets. ]
Oceanic Systems - Manufacturers of aquariums in different shapes including custom designs. also produces caps and stands.
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Pro Clear Aquatic Systems, Inc. - Manufactures filters, protein skimmers, pumps and lights, as well as making and installing aquariums and filtration systems for retail stores, private collectors, and wholesalers. Jacksonville, Florida, USA.
Red Sea - Manufacturers of a variety of aquarium equipment in Houston, Texas.
Rochester Reefs - Making custom acrylic reef aquarium supplies. Located in Rochester, New York, USA.
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Saline Solutions Inc. - Manufacturers of acrylic aquariums and saltwater/freshwater filtration products including protein skimmers, trickles, prefilters and carbon dioxide reactors.
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Salt Lake Shoreline Aquaculture, LLC. - Suppliers of brine shrimp eggs and larval feeds for the shrimp, fish and aquarium industries. Includes nutrition analysis and hatching information.
Sealand Holdings Co Ltd - Product range includes fish tanks and related equipment. Located in Hong Kong.
Sho Koi Ultra - Producers of food for koi and pond fish. Includes feeding guide and care advice.
The Classic Cabinet Company - Manufacturers of aquarium cabinets and hoods, with stockists throughout the United Kingdom.
Meta Description: [ The Classic Cabinet Company specialise in the manufacture of quality aquarium cabinets. These very attractive pieces of furniture enable the discerning fishkeeper to enjoy their hobby at home. ]
Tropical Marine Centre - Supplies tropical marine fish and invertebrates in Europe and manufactures a wide range of aquatic products.
Meta Description: [ TMC - Europe's leading marine fish supplier - manufacturer & distributer of market leading aquatic equipment and commercial filtration products ]
Yong Cheng Aquatic Equipments Factory - Manufacturing aquariums, pumps, lights, filters and accessories. Zhongshan, Guangdong, China.
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