Pet care from published sources Breed and species profiles, care guides and free tools Pictures are AI illustrations
Weekly email
Home/Pets/Fish

Fish

93 detailed guides covering history, temperament, care, health, and training for every fish.

Auf Deutsch lesen - 93 Porträts

Fish
93 shown
Goldfish

Goldfish

The goldfish (Carassius auratus) is one of the oldest domesticated fish in the…
Betta (Siamese Fighting Fish)

Betta (Siamese Fighting Fish)

The Betta (Betta splendens) is one of the most popular and most mis-housed…
Guppy

Guppy

The Guppy (Poecilia reticulata) is one of the most popular and easiest tropical…
Neon Tetra

Neon Tetra

The Neon Tetra (Paracheirodon innesi) is the iconic small community fish - a…
Cardinal Tetra

Cardinal Tetra

The Cardinal Tetra (Paracheirodon axelrodi) is the more brilliantly coloured…
Angelfish

Angelfish

The Angelfish (Pterophyllum scalare) is one of the most recognisable aquarium…
Discus

Discus

The Discus (Symphysodon species), nicknamed the "king of the aquarium", is a…
Corydoras Catfish

Corydoras Catfish

Corydoras catfish (Corydoras genus) are small, sociable, armoured…
Bristlenose Pleco

Bristlenose Pleco

The Bristlenose Pleco (Ancistrus species) is a small armoured catfish from…
Cichlid (Overview)

Cichlid (Overview)

Cichlids are an enormous family of freshwater fish (at least 1,760 described…
Molly / Platy / Swordtail (Livebearers)

Molly / Platy / Swordtail (Livebearers)

Molly, Platy, and Swordtail are three closely related livebearing fish from…
Killifish

Killifish

Killifish are a diverse group of small colourful fish from around the world…
Dwarf Gourami

Dwarf Gourami

The Dwarf Gourami (Trichogaster lalius) is a small, brightly coloured labyrinth…
Oscar

Oscar

The Oscar (Astronotus ocellatus) is a large, intelligent South American cichlid…
Zebra Danio

Zebra Danio

The Zebra Danio (Danio rerio) is a small, hardy, endlessly active schooling…
Harlequin Rasbora

Harlequin Rasbora

The Harlequin Rasbora (Trigonostigma heteromorpha) is a small, peaceful…
Kuhli Loach

Kuhli Loach

The Kuhli Loach (Pangio kuhlii) is a small, peaceful, eel-shaped bottom-dweller…
Tiger Barb

Tiger Barb

The Tiger Barb (Puntigrus tetrazona) is a small, active, boisterous schooling…
Platy

Platy

The Platy (Xiphophorus maculatus) is a small, hardy, brightly coloured…
Molly

Molly

The Molly (Poecilia sphenops / Poecilia latipinna) is a hardy, peaceful…
German Blue Ram

German Blue Ram

The German Blue Ram (Mikrogeophagus ramirezi) is a small, strikingly colorful…
Honey Gourami

Honey Gourami

The Honey Gourami (Trichogaster chuna) is a small, peaceful, beginner-friendly…
Ember Tetra

Ember Tetra

The ember tetra (Hyphessobrycon amandae) is a tiny, glowing-orange nano fish…
Swordtail

Swordtail

The swordtail (Xiphophorus hellerii) is a hardy, active livebearer named for…
Pearl Gourami

Pearl Gourami

The pearl gourami (Trichopodus leerii) is a graceful labyrinth fish covered in…
Cherry Barb

Cherry Barb

The cherry barb (Puntius titteya) is a small, peaceful schooling fish prized…
Otocinclus

Otocinclus

The otocinclus (Otocinclus sp.), often called the "oto" or dwarf sucker…
Rummynose Tetra

Rummynose Tetra

The rummynose tetra (Hemigrammus rhodostomus) is a striking schooling fish…
Rosy Barb

Rosy Barb

The rosy barb (Pethia conchonius) is a hardy, active schooling fish from South…
Endler

Endler

The Endler (Poecilia wingei), often called Endler's livebearer, is a tiny…
Boesemani Rainbowfish

Boesemani Rainbowfish

The Boesemani rainbowfish (Melanotaenia boesemani) is one of the most…
Celestial Pearl Danio

Celestial Pearl Danio

The celestial pearl danio (Danio margaritatus), often sold as the "galaxy…
Apistogramma

Apistogramma

Apistogramma is a large genus of South American dwarf cichlids, with over 90…
Kribensis

Kribensis

The kribensis (Pelvicachromis pulcher) is a hardy West African dwarf cichlid…
Convict Cichlid

Convict Cichlid

The convict cichlid (Amatitlania nigrofasciata, formerly Archocentrus…
Firemouth Cichlid

Firemouth Cichlid

The firemouth cichlid (Thorichthys meeki) is a handsome, medium-sized Central…
Electric Blue Acara

Electric Blue Acara

The electric blue acara is a stunning man-made colour form of the blue acara…
Clown Loach

Clown Loach

The clown loach (Chromobotia macracanthus) is a bold, orange-and-black striped…
Siamese Algae Eater

Siamese Algae Eater

The Siamese algae eater (Crossocheilus oblongus, sometimes sold as…
White Cloud Mountain Minnow

White Cloud Mountain Minnow

The white cloud mountain minnow (Tanichthys albonubes) is a tiny, hardy…
Glowlight Tetra

Glowlight Tetra

The glowlight tetra (Hemigrammus erythrozonus) is a small, peaceful nano tetra…
Pea Puffer

Pea Puffer

The pea puffer (Carinotetraodon travancoricus), also called the dwarf or Indian…
Comet Goldfish

Comet Goldfish

The Comet is a slim, athletic, single-tailed American goldfish breed with a…
Shubunkin Goldfish

Shubunkin Goldfish

The Shubunkin is a hardy single-tailed calico goldfish with a mosaic of blue…
Fantail Goldfish

Fantail Goldfish

The Fantail is an egg-shaped fancy goldfish with a doubled, fan-spread tail…
Ryukin Goldfish

Ryukin Goldfish

In the Ryukin, a tall dorsal hump rising steeply behind the head gives the fish…
Oranda Goldfish

Oranda Goldfish

The Oranda is a fancy goldfish with a fleshy crown (the 'wen') that grows over…
Ranchu Goldfish

Ranchu Goldfish

The Ranchu, known in Japan as the 'king of goldfish', has a back without a…
Black Moor Goldfish

Black Moor Goldfish

The Black Moor is a matte-black telescope-eyed goldfish whose protruding eyes…
Telescope Goldfish

Telescope Goldfish

The Telescope goldfish carries its eyes on turrets - protruding orbs that give…
Pearlscale Goldfish

Pearlscale Goldfish

The Pearlscale is a nearly spherical goldfish armoured in raised, calcium-domed…
Bubble Eye Goldfish

Bubble Eye Goldfish

The Bubble Eye is a dorsal-less, slow goldfish carrying two fluid-filled sacs…
Celestial Eye Goldfish

Celestial Eye Goldfish

The Celestial gazes permanently at the sky - telescope eyes rotated fully…
Lionhead Goldfish

Lionhead Goldfish

The Lionhead is the original dorsal-less goldfish breed from China, whose head…
Wakin Goldfish

Wakin Goldfish

The Wakin is a Japanese pond goldfish with a slim single body and a double…
Kohaku Koi

Kohaku Koi

Kohaku is a koi variety with pure white skin carrying red (hi) patterns, often…
Taisho Sanke Koi

Taisho Sanke Koi

Taisho Sanke - 'Sanke' to friends - is Kohaku wearing ink: the same white base…
Showa Koi

Showa Koi

Showa, one of the koi varieties known as the Big Three, is fundamentally a…
Ogon Koi

Ogon Koi

The Ogon is koi minimalism - one solid metallic colour, usually platinum white…
Asagi Koi

Asagi Koi

Asagi is the koi variety closest to the original ornamental carp, wearing a…
Shusui Koi

Shusui Koi

Shusui is a scaleless (doitsu) form of the Asagi, keeping only a single row of…
Tancho Koi

Tancho Koi

The Tancho is a pure white koi whose only red is a single round crest centred…
Butterfly Koi

Butterfly Koi

Butterfly koi trail fins like silk scarves - long-finned koi bred from…
Veiltail Betta

Veiltail Betta

The Veiltail is the classic pet-store betta - a long, drooping caudal fin that…
Crowntail Betta

Crowntail Betta

The Crowntail Betta is the spikiest betta variety - its fin webbing is reduced…
Halfmoon Betta

Halfmoon Betta

The Halfmoon Betta is a Betta splendens variety bred for a caudal fin that…
Plakat Betta

Plakat Betta

The Plakat is the short-finned betta - the variety closest to Thailand's…
Doubletail Betta

Doubletail Betta

The Doubletail Betta is a Betta splendens variety whose caudal fin is…
Dumbo Ear Betta

Dumbo Ear Betta

The Dumbo Ear Betta is a Betta splendens variety defined by hugely oversized…
Koi Betta

Koi Betta

The Koi Betta is a marble-patterned Betta splendens bred to mimic pond koi…
Giant Betta

Giant Betta

The Giant Betta is a selectively bred, super-sized Betta splendens that reaches…
Rosetail Betta

Rosetail Betta

The Rosetail Betta is a Halfmoon pushed past its limit - excessive branching in…
Alien Betta

Alien Betta

The Alien Betta is a hybrid variety created by crossing domestic Betta…
Cobra Guppy

Cobra Guppy

The Cobra Guppy is a fancy guppy variety defined by its snakeskin-style pattern…
Tuxedo Guppy

Tuxedo Guppy

The Tuxedo Guppy wears its name on its body - a pale silver or gold front half…
Moscow Guppy

Moscow Guppy

The Moscow Guppy is a fancy guppy strain defined by a single trait no other…
Grass Guppy

Grass Guppy

The Grass Guppy is a fancy guppy variety defined by a fine peppering of tiny…
Dumbo Ear Guppy

Dumbo Ear Guppy

The Dumbo Ear Guppy is a fancy guppy variety defined by oversized, elephant-ear…
Albino Guppy

Albino Guppy

The Albino Guppy is a fancy guppy variety defined by a recessive gene that…
Snakeskin Guppy

Snakeskin Guppy

The Snakeskin Guppy is a fancy variety of Poecilia reticulata defined by a…
Half-Black Guppy

Half-Black Guppy

The Half-Black Guppy wears the fancy-guppy world's tuxedo - a dense black rear…
Mosaic Guppy

Mosaic Guppy

The Mosaic Guppy is a fancy guppy variety defined by an irregular…
Delta Tail Guppy

Delta Tail Guppy

The Delta Tail Guppy carries the largest tail in the guppy hobby - a wide…
Dragon Scale Betta

Dragon Scale Betta

The Dragon Scale Betta is not a fin shape but a scale trait: a thick, opaque…
Marble Betta

Marble Betta

The Marble Betta's pattern - irregular dark blotches over a pale or cellophane…
Mustard Gas Betta

Mustard Gas Betta

The Mustard Gas Betta is a bicolor: a dark blue, steel, or green body paired…
Black Orchid Betta

Black Orchid Betta

The Black Orchid Betta is a near-black fish shot through with iridescent blue…
Butterfly Betta

Butterfly Betta

The Butterfly Betta is defined by a band: the body color runs out into the fins…
Leopard Guppy

Leopard Guppy

The Leopard Guppy is a tail-pattern strain: round, separate, rosette-like spots…
Japan Blue Guppy

Japan Blue Guppy

The Japan Blue Guppy is named for a single striking trait: a horizontal…
Full Red Guppy

Full Red Guppy

The Full Red Guppy is exactly what the name promises: a male covered in solid…
Platinum Guppy

Platinum Guppy

The Platinum Guppy is a body trait rather than a tail pattern: a thick metallic…
Blue Neon Guppy

Blue Neon Guppy

The Blue Neon Guppy, also sold as Neon Blue, is a European-bred strain built…

Everyday gear for aquariums

Aquarium filter The hardest-working thing in the tank. Check price Heater Stable temperature beats perfect temperature. Check price Water conditioner Tap water is not fish water until treated. Check price Test kit You cannot manage what you cannot measure. Check price

Links go to Amazon or a partner brand's own store and may earn us a commission at no extra cost to you. As an Amazon Associate we earn from qualifying purchases. An Amazon link leads to a type of gear and you choose the exact product; a card that names a store leads to that partner's own shop.

Join and grab our free new-pet kit.

Subscribe and start with our free new-pet checklist and care log - then one Friday email, a single care topic taken apart properly. Leave whenever you like.



© 2026 Pawholt · Independent pet-care guides, written with AI and checked against published sources · How we use AI · Editorial policy · Affiliate disclosure · Privacy
As an Amazon Associate we earn from qualifying purchases.