Atlantic herring

Discover great deals on the many top brand items available only on eBay!

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...

HomeHome
BirdsBirds
CatsCats
DogsDogs
FerretsFerrets
FishFish
Aquarium CoralAquarium Coral
Aquarium DecorationsAquarium Decorations
Aquarium LightingAquarium Lighting
Aquarium Meters, RegulatorsAquarium Meters, Regulators
Aquarium StandsAquarium Stands
Aquariums & BowlsAquariums & Bowls
Cleaning & Water TreatmentsCleaning & Water Treatments
Crabs, Snails & Algae EatersCrabs, Snails & Algae Eaters
Filtration & HeatingFiltration & Heating
Fish FoodFish Food
Live Aquarium PlantsLive Aquarium Plants
Live Aquarium RockLive Aquarium Rock
Other Fish SuppliesOther Fish Supplies
RefractometersRefractometers
Tropical FishTropical Fish
Guinea PigsGuinea Pigs
HorsesHorses
Other AnimalsOther Animals
RabbitsRabbits
ReptilesReptiles
RodentsRodents
Sugar GlidersSugar Gliders
Tadpoles & FrogsTadpoles & Frogs
TurtlesTurtles

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


[List your site here Free!]

1 inch Marimo Moss Ball (Cladophora Live Aquarium Plant) Fish Tank plant1 inch Marimo Moss Ball (Cladophora Live Aquarium Plant) Fish Tank plant $7.00 Dwarf Hairgrass Mini Eleocharis Parvula Live Aquarium Plants Buy 2 Get 1 Free ✅Dwarf Hairgrass Mini Eleocharis Parvula Live Aquarium Plants Buy 2 Get 1 Free ✅ $8.99
Aquaneat Aquarium Led Light Marine Fowlr Blue & White 12 20 24 30 36 48 InchAquaneat Aquarium Led Light Marine Fowlr Blue & White 12 20 24 30 36 48 Inch $10.99 to New Marimo Moss Balls 0.5 inch (1.3cm) (Cladophora) Live Plant Aquarium In UsaNew Marimo Moss Balls 0.5 inch (1.3cm) (Cladophora) Live Plant Aquarium In Usa $6.85
Three ( 3 ) Tiny PeeWees Live Pet Land Snails Hand Raised pets, educationalThree ( 3 ) Tiny PeeWees Live Pet Land Snails Hand Raised pets, educational $9.95 10 Stems/bunch Anacharis Elodea Densa Egeria - aquarium and/or pond plant10 Stems/bunch Anacharis Elodea Densa Egeria - aquarium and/or pond plant $4.75
1000+ Duckweed (Lemna minor) Indoor Grown Buy 2 Get 1 Free + Extra Mystery Plant1000+ Duckweed (Lemna minor) Indoor Grown Buy 2 Get 1 Free + Extra Mystery Plant $6.95 *Buy 2 Get 1 Free* Micranthemum Monte Carlo Easy Carpet Live Aquarium Plant ✅*Buy 2 Get 1 Free* Micranthemum Monte Carlo Easy Carpet Live Aquarium Plant ✅ $9.49
5 Nerite Snails (Premium Species Pack) - Live Freshwater Snail Plants5 Nerite Snails (Premium Species Pack) - Live Freshwater Snail Plants $19.99 Aquarium Water Pump Submersible Fountain Pond Pump HydroponicsAquarium Water Pump Submersible Fountain Pond Pump Hydroponics $7.15 to
Beamswork Vivio Full Spectrum Led Aquarium Fish Tank Light Dimmer Fixed TimerBeamswork Vivio Full Spectrum Led Aquarium Fish Tank Light Dimmer Fixed Timer $18.95 to Live Yellow Bellied Slider TurtleLive Yellow Bellied Slider Turtle $30.00
One (1) Live Jumbo Land Snail Hand Raised Pet. educational,One (1) Live Jumbo Land Snail Hand Raised Pet. educational, $12.95 Aquarium Tank Vacuum Siphon Gravel Cleaner Pump Water Change Safe for FishAquarium Tank Vacuum Siphon Gravel Cleaner Pump Water Change Safe for Fish $5.88
Three (3) Live Large Land Snails Hand Raised Pet. educationalThree (3) Live Large Land Snails Hand Raised Pet. educational $19.95 10 Pack - Vallisneria Americana Eelgrass *Fast-Growing* Live Aquarium Plants ✅10 Pack - Vallisneria Americana Eelgrass *Fast-Growing* Live Aquarium Plants ✅ $9.49
Buy 2 Get 1 Free Echinodorus Rosette Sword Amazon Plant Live Aquarium Plants ✅Buy 2 Get 1 Free Echinodorus Rosette Sword Amazon Plant Live Aquarium Plants ✅ $8.99 8+Pink/Red/Blu leopard/Mix color Ramshorn Snails With 2 Type Free Floating Plant8+Pink/Red/Blu leopard/Mix color Ramshorn Snails With 2 Type Free Floating Plant $18.45 to
Aquaneat Aquarium Heater 25-500W Anti-Explosion for Tropical Fish Tank 5-100 galAquaneat Aquarium Heater 25-500W Anti-Explosion for Tropical Fish Tank 5-100 gal $8.99 to Water Pump Hydroponics Pond Fountain Aquariums Submersible Powerhead Fish TankWater Pump Hydroponics Pond Fountain Aquariums Submersible Powerhead Fish Tank $7.99 to
12+ (3 Pink, 3 Blue, 3 Red, 3 Brown) Beautiful Ramshorn Snails Live Freshwater12+ (3 Pink, 3 Blue, 3 Red, 3 Brown) Beautiful Ramshorn Snails Live Freshwater $10.00 Brine shrimp eggs 90% (3.52 Oz. 100 grams)Brine shrimp eggs 90% (3.52 Oz. 100 grams) $13.38
7+ Algae Eater, Ramshorn Snails, Aquarium or Pond, Live Snail Clean Up Crew!7+ Algae Eater, Ramshorn Snails, Aquarium or Pond, Live Snail Clean Up Crew! $14.98 Bio Sponge Filter Breeding Fry Betta Shrimp Nano Fish Tank Aquarium Up to 60 GalBio Sponge Filter Breeding Fry Betta Shrimp Nano Fish Tank Aquarium Up to 60 Gal $5.18 to
10 (+1 Doa) Fire Red Cherry Shrimp Imported From Thailand10 (+1 Doa) Fire Red Cherry Shrimp Imported From Thailand $26.99 Premium Tropical Fish Flake Food! - Perfect For All Freshwater Fish!Premium Tropical Fish Flake Food! - Perfect For All Freshwater Fish! $8.95 to
Two (2) Live Pet Land Snail Hand Raised Pet, educational, petsTwo (2) Live Pet Land Snail Hand Raised Pet, educational, pets $11.95 *! !Sale ! *Buy 2 Get 1 Free* Live Aquarium Plant Aquatic Plants Java Moss*! !Sale ! *Buy 2 Get 1 Free* Live Aquarium Plant Aquatic Plants Java Moss $5.99
Christmas Moss Vesicularia Live Aquarium Plant Java Moss Buy 2 Get 1 Free ✅Christmas Moss Vesicularia Live Aquarium Plant Java Moss Buy 2 Get 1 Free ✅ $7.99 $7.99
10 + extra Cherry Neocaridina Shrimp10 + extra Cherry Neocaridina Shrimp $27.23 10-Ft Roll Blue Bonded Aquarium Filter Media Pad 12" X 10' Filter Fiber Floss.10-Ft Roll Blue Bonded Aquarium Filter Media Pad 12" X 10' Filter Fiber Floss. $11.95
Anubias Nana Petite Anubias Plant Easy Live Aquarium Plants Buy 2 Get 1 FreeAnubias Nana Petite Anubias Plant Easy Live Aquarium Plants Buy 2 Get 1 Free $9.48 Aquaneat Aquarium Led Light Multi-Color Full Spectrum 12 20 24 30 36 48 InchAquaneat Aquarium Led Light Multi-Color Full Spectrum 12 20 24 30 36 48 Inch $10.99 to
Brine Shrimp Eggs, Premium Grade 90% Hatch, Great Salt Lake (Artemia Cysts) EggsBrine Shrimp Eggs, Premium Grade 90% Hatch, Great Salt Lake (Artemia Cysts) Eggs $5.99 to
Click to see more Fish items at www.ebay.com
Prices current as of last update, 08/10/22 9:27am.

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

Home Contact Resources Exchange Links ebay