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Species

Browsing 2,303 species. Use the filters below to narrow down.

Odessa Barb

Odessa Barb

Fish

Pethia padamya

A barb with a mysterious past and males that blaze red when rivals are near.

Ogre Catfish

Ogre Catfish

Fish

Asterophysus batrachus

A gulper catfish that can swallow prey nearly twice its own size.

Okavango Tilapia

Okavango Tilapia

Fish

Tilapia ruweti

A compact African cichlid with big personality from wild swamp habitats.

Okinawa Goby

Okinawa Goby

Fish

Gobiodon okinawae

Tiny, vivid, and inseparable from its Acropora home.

Olga

Olga

Fish

Corydoras simulatus

A rarely documented Colombian cory with a color pattern that keeps even experts guessing.

Olive danio

Olive danio

Fish

Danio dangila

A large, active danio with impressively long barbels and a rarely seen wild side.

One-lined Pencilfish

One-lined Pencilfish

Fish

Nannostomus unifasciatus

A tiny pencilfish that swims at a permanent angle, day and night.

Oneline Tetra

Oneline Tetra

Fish

Nannaethiops unitaeniatus

A peaceful little African schooler that deserves far more attention than it gets.

One-spot Eartheater

One-spot Eartheater

Fish

Satanoperca lilith

A rarely traded eartheater with a single bold flank spot and surprising social depth.

One Spot Mouthbrooder

One Spot Mouthbrooder

Fish

Betta unimaculata

A mouthbrooding Betta from Borneo that bucks the aggressive stereotype entirely.

Onespot Squeaker

Onespot Squeaker

Fish

Synodontis notata

A daytime-active catfish with a bold personality to match its bold spot.

One-stripe Anthias

One-stripe Anthias

Fish

Pseudanthias fasciatus

A deep-reef anthias famous for swimming upside-down along cave ceilings.

One-stripe Spiny Eel

One-stripe Spiny Eel

Fish

Macrognathus aculeatus

A serpentine burrower with a single bold stripe and a secretive personality.

Opsarius ardens

Opsarius ardens

Fish

Barilius ardens

A fast-moving Western Ghats minnow that needs space, speed, and bold companions.

Opsarius malabaricus

Opsarius malabaricus

Fish

Barilius malabaricus

A fast, bold river minnow from India's Western Ghats that needs room to move.

Oranda Goldfish

Oranda Goldfish

Fish

Carassius auratus var. oranda

The velvet-capped fancy goldfish that rewards patient, attentive keeping.

Orange Chromide

Orange Chromide

Fish

Etroplus maculatus

The only cichlid native to India, with a fascinating cleaning-fish side hustle.

Orange Ctenopoma

Orange Ctenopoma

Fish

Microctenopoma ansorgii

A jewel-toned African labyrinth fish that rewards patient, experienced keepers.

Orange dwarf toothcarp

Orange dwarf toothcarp

Fish

Neoheterandria elegans

A tiny Colombian livebearer with a fascinating near-mammalian reproductive twist.

Orangefin Anemonefish

Orangefin Anemonefish

Fish

Amphiprion chrysopterus

A large, bold anemonefish from the wide Pacific with serious territorial attitude.

Orange-fin Barb

Orange-fin Barb

Fish

Barbus eutaenia

A sleek African barb from fast, rocky streams that rewards patient keepers.

Orange-fin Stiphodon

Orange-fin Stiphodon

Fish

Stiphodon maculidorsalis

A tiny Indonesian stream goby with bold dorsal markings worth seeking out.

Orangefin Tetra

Orangefin Tetra

Fish

Bryconops affinis

A restless, fast-moving shoaler from the Guiana Shield's coastal streams.

Orangeflossen

Orangeflossen

Fish

Laetacara fulvipinnis

A tiny blackwater cichlid with warm-toned fins and a gentle personality.

Orange Head

Orange Head

Fish

Geophagus sp. "Orange Head"

A vividly capped cichlid that rewards patient keepers with fascinating mouthbrooding family life.

Orangespine Unicornfish

Orangespine Unicornfish

Fish

Naso elegans

A bold reef grazer with vivid orange tail spines and a distinctly regal profile.

Orangespot Surgeonfish

Orangespot Surgeonfish

Fish

Acanthurus olivaceus

A bold orange shoulder-stripe makes this reef surgeon impossible to mistake.

Orangestriped Triggerfish

Orangestriped Triggerfish

Fish

Balistapus undulatus

One of the reef's most aggressive personalities packed into a boldly patterned body.

Orchid Dottyback

Orchid Dottyback

Fish

Pseudochromis fridmani

A bold little Red Sea endemic that punches well above its weight.

Orchid Island Goby

Orchid Island Goby

Fish

Rhinogobius lanyuensis

A tiny island goby from one of Taiwan's most remote corners.

Orinoco

Orinoco

Fish

Andinoacara sp. "Orinoco"

A mellow Orinoco cichlid that pairs easily and rewards patient breeders.

Orinoco Eartheater

Orinoco Eartheater

Fish

Biotodoma wavrini

A slender eartheater that thrives in groups and rewards patient, experienced keepers.

Orinoco sailfin catfish

Orinoco sailfin catfish

Fish

Pterygoplichthys multiradiatus

A dinosaur-sized algae grazer built for decades of service in large tanks.

Orinoco Tetra

Orinoco Tetra

Fish

Hemigrammus barrigonae

A rare Orinoco tetra that rewards patient keepers willing to seek it out.

Ornate Bichir

Ornate Bichir

Fish

Polypterus ornatipinnis

An ancient, armored predator that breathes air and prowls the night.

Ornate Corydoras

Ornate Corydoras

Fish

Corydoras ornatus

A long-lived Tapajós bottom-dweller that thrives in sociable, peaceful groups.