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Species

Browsing 3,374 species. Use the filters below to narrow down.

Ocellated Snakehead

Ocellated Snakehead

Fish

Channa pleurophthalma

Bold ocellus markings and predatory charisma from the peat swamps of Borneo.

Ocellated Wrasse

Ocellated Wrasse

Fish

Halichoeres melasmapomus

A bold cheek-spotted wrasse with a wide Pacific range and big personality.

Ocellate Freshwater Stingray

Ocellate Freshwater Stingray

Fish

Potamotrygon motoro

A disc-shaped apex predator that can learn to recognize its keeper.

Ocellifer Catfish

Ocellifer Catfish

Fish

Synodontis ocellifer

A hardy West African catfish with bold spots and a long, distinctive adipose fin.

Octopus Coral

Octopus Coral

Coral

Galaxea alta

A bold, spreading coral with dramatic polyp extension that commands attention.

Octopus Coral

Octopus Coral

Coral

Galaxea astreata

A sprawling, tentacled coral with surprisingly sharp defensive reach.

Octopus Coral

Octopus Coral

Coral

Galaxea cryptoramosa

A branching Galaxea with detailed fused corallites and a quietly distinctive look.

Octopus Coral

Octopus Coral

Coral

Galaxea longisepta

A small encrusting coral with unusually long, irregular septa and bold white rims.

Octopus Coral

Octopus Coral

Coral

Galaxea paucisepta

A small, textured reef coral with a knobby skeleton and calm disposition.

Ocular Coral

Ocular Coral

Coral

Madrepora oculata

A deep-sea reef builder that occasionally ventures into aquarium-friendly depths.

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.

Olive Nerite Snail

Olive Nerite Snail

Invert

Neritina reclivata

A tough little algae grazer that thrives where fresh and salt water meet.

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.

Opae Ula

Opae Ula

Invert

Halocaridina rubra

Tiny Hawaiian shrimp that thrives on neglect in brackish anchialine pools.

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 Ball Anemone

Orange Ball Anemone

Coral

Pseudocorynactis caribbeorum

A nocturnal Caribbean predator with sticky orange-tipped tentacles that can snag small fish.

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 Cup Coral

Orange Cup Coral

Coral

Balanophyllia (Balanophyllia) elegans

A vivid cold-water coral that thrives in the shade where most corals fail.

Orange Cup Coral

Orange Cup Coral

Coral

Tubastraea columnata

A bold, non-photosynthetic coral that rewards patient target feeders with vivid blooms.

Orange Cup Coral

Orange Cup Coral

Coral

Tubastraea grandidentata

A non-photosynthetic branching coral that thrives in dim, current-swept reef spots.

Orange dwarf toothcarp

Orange dwarf toothcarp

Fish

Neoheterandria elegans

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

Orange Encrusting Anemone

Orange Encrusting Anemone

Coral

Epizoanthus scotinus

A cold-water Pacific zoanthid that brings bold orange color to cooler reef tanks.