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Fish beginning with O
Oblique butterflyfish - Prognathodes obliquus is a species of fish in the Chaetodontidae family.
Oblique-swimming triplefin - Its length is between 5 and 8 cm.
Ocean pout - Scientists have done studies wherein genes are taken from the ocean pout and implanted into salmon in an attempt to make the latter grow faster.
Oceanic lightfish - The oceanic lightfish, Vinciguerria nimbaria, a lightfish of the genus Vinciguerria, is found in all deep tropical and subtropical oceans and seas, from depths of 20 to 5,000 m.
Ocellate triplefin - The ocellate triplefin, Apopterygion oculus, is a threefin blenny of the family Tripterygiidae, found around the coast of New Zealand to depths of between 14 and 186 m in reef areas of broken rock and shellgrit.
Ocellated angel shark - Reproduction is ovoviviparous.
Ocellated dragonet - Synchiropus ocellatus is a species of tropical marine fish in the Dragonet family.
Ocellated electric ray - The bullseye electric ray or ocellated electric ray, Diplobatis ommata, is a species of numbfish, family Narcinidae, native to the eastern Pacific Ocean from Baja California to Ecuador.
Ocellated flounder - Ancylopsetta ommata is a species of flounder in the Paralichthyidae family.
Ocellated frogfish - The ocellated frogfish, Antennarius ocellatus, is a frogfish of the family Antennariidae, found in the western Atlantic including the eastern portion of the Gulf of Mexico, and the Caribbean Sea, to depths of 150 m.
Ocellated pipefish - Ovoviviparous, the male carries the eggs in a brood pouch which is found under the tail.
Ocellated wrasse - Main Ref:Quignard, J.
Ochre-striped cardinalfish - Apogon compressus, commonly called the ochre-striped cardinalfish, is a Cardinalfish from the Indo-West Pacific.
Odontamblyopus lacepedii - This species excavates elaborate vertical burrows up to 90 cm long in the sea bed.
Offshore lizardfish - The offshore lizardfish, Synodus poeyi, is a type of lizardfish or Synodontidae that occurs chiefly in the Western Atlantic
Offshore silver hake - The haddock is easily recognized by a black lateral line running along its white side and a distinctive dark blotch above the pectoral fin, often described as a "thumbprint" or even the "Devil's thumbprint" or "St.
Ogilby's rainbowfish - Ogilby's rainbowfish is a species of fish in the Melanotaeniidae family.
Ogilbys wobbegong - Reproduction is ovoviviparous.
Ohrid trout - The Ohrid trout, Salmo letnica , is a type of trout found in the Republic of Macedonia and Albania, especially in Lake Ohrid.
Okaloosa darter - Because of extensive habitat improvement efforts by the Jackson Guard at Eglin Air Force Base, the US Fish & Wildlife Service recommended that the fish be reclassified from endangered to threatened status in 2007.
Okinawa goby - G.
Ol'wife - It is a large fish that reaches 60cm in length.
Olive Kivu haplo - Haplochromis olivaceus is a species of fish in the Cichlidae family.
Olivegreen ufipa barb - The Olive-green Ufipa Barb is a species of ray-finned fish in the Cyprinidae family.
Olympic mudminnow - The Olympic mudminnow is the only species in genus Novumbra, and one of five species worldwide in the family Umbridae.
Olyra collettii - Olyra collettii is a species of catfish of the family Bagridae.
Oman bullhead shark - The Oman bullhead shark, Heterodontus omanensis, is a bullhead shark of the family Heterodontidae, found in the tropical western Indian Ocean around central Oman from the surface to 70 m.
One spot demoiselle - The one-spot puller or brown puller , Chromis hypsilepis, is a damselfish of the genus Chromis, found off south east Australia and between North Cape and East Cape of the North Island of New Zealand to depths of about 60 metres, off rocky coasts.
One-and-a-half-stripe hap - It is found in Malawi, Mozambique, and Tanzania.
One-finned shark - The sharpnose sevengill shark, Heptranchias perlo, is a species of shark in the family Hexanchidae, and the only species in the genus Heptranchias.
Oneband anemonefish - The tomato clownfish, Amphiprion frenatus, is a clownfish that is found in the waters of the Western Pacific, from the Ryukyu Islands, Japan, to Malaysia and Indonesia.
Onefin cat shark - The onefin catshark, Pentanchus profundicolus, is a catshark of the family Scyliorhinidae, the only member of the genus Pentanchus.
Onespot barb - The onespot barb or Teri barb, Puntius terio, is a tropical freshwater fish belonging to the Cyprininae sub-family of the Cyprinidae family.
Opal pearlfish - The Opalescent Pearlfish is a species of fish in the Rivulidae family.
Opalfish - The opalfish, Hemerocoetes monopterygius, is a duckbill of the genus Hemerocoetes, found only around New Zealand, at depths of between 5 and 200 m.
Opata sucker - The Matalote Opata is a species of ray-finned fish in the Catostomidae family.
Ophthalmotilapia boops - Ophthalmotilapia boops is a species of fish in the Cichlidae family.
Ophthalmotilapia heterodonta - Ophthalmotilapia heterodonta is a species of fish in the Cichlidae family.
Ophthalmotilapia nasuta - Ophthalmotilapia nasuta is a species of fish in the Cichlidae family.
Ophthalmotilapia ventralis - Ophthalmotilapia ventralis is a species of fish in the Cichlidae family.
Opsaridium loveridgii - Opsaridium loveridgii is a species of ray-finned fish in the Cyprinidae family.
Opsaridium splendens - Opsaridium splendens is a species of ray-finned fish in the Cyprinidae family.
Orange clingfish - The orange clingfish, Diplocrepis puniceus, is a clingfish, the only species in the genus Diplocrepis.
Orange clinid - The orange clinid, Ericentrus rubrus, is a weedfish of the genus Ericentrus, found around New Zealand in rock pools and from low water to depths of about 15 m, in reef areas.
Orange clownfish - The Amphiron Percula can grow to be 11cm in length, but is on average 8cm, and can be recognized by three white lines across their bright orange bodies, with no distinction in color between sexes.
Orange dottyback - The neon dottyback, Pseudochromis aldabraensis, is a fish commonly kept in marine aquariums.
Orange river mudfish - Orange River Mudfish is a species of fish in genus Labeo.
Orange tail Kivu haplo - Haplochromis microchrysomelas is a species of fish in the Cichlidae family.
Orange wrasse - The orange wrasse, Pseudolabrus luculentus, is a wrasse of the genus Pseudolabrus, found in eastern Australia and around New Zealand in reef areas at depths of between 5 and 50 m.
Orange-fringed largemouth - The orange-fringed largemouth is a species of fish in the Cichlidae family.
Orange-fringed largemouth - It is found in Malawi, Mozambique, and Tanzania.
Orange-red pigmy grouper - Cephalopholis spiloparaea is a grouper from the Indo-Pacific Ocean.
Orangeback angelfish - When kept in an aquarium orangeback angelfish are distributed throughout the tank.
Orangefin barb - Redspot Barb is a species of ray-finned fish in the genus Barbus.
Orangefin shiner - Orangefin Shiner is a species of ray-finned fish in the genus Notropis.
Orangehead anthias - Pseudanthias heemstrai is a Pseudanthias fish from the Western Indian Ocean.
Orangespine unicornfish - Naso lituratus or the Orangespine unicornfish or Naso tang ( is a tang from the Pacific Ocean.
Orangespotted sunfish - The orangespotted sunfish reaches a maximum recorded length of about 15 cm.
Orangespotted trevally - The orangespotted trevally is classified within the genus Carangoides, a group of fish commonly called jacks and trevallies.
Orbicular batfish - Its body is almost disc-shaped, and very thin; the tail, about 20% of the body length, is fan-shaped and taller than it is long.
Orbiculate cardinalfish - In the Orbiculate cardinalfish, males incubate the eggs in their mouth until they hatch.
Orchid dottyback - A small fish that reaches three inches in length.
Orectolobus halei - O.
Oregon chub - The Oregon Chub is a species of ray-finned fish in the Cyprinidae family.
Oreichthys cosuatis - They are strictly freshwater, and are found in ditches, ponds, streams and canals .
Oreochromis amphimelas - Oreochromis amphimelas is a species of fish in the Cichlidae family.
Oreochromis chungruruensis - Oreochromis chungruruensis is a species of fish in the Cichlidae family.
Oreochromis lidole - Oreochromis lidole is a species of fish in the Cichlidae family.
Oreochromis pangani girigan - Oreochromis pangani is a species of fish in the Cichlidae family.
Oreochromis squamipinnis - Oreochromis squamipinnis is a species of fish in the Cichlidae family.
Oreochromis tanganicae - Oreochromis tanganicae is a species of fish in the Cichlidae family.
Oreoglanis macronemus - This is a very small catfish , generally smaller than most other Oreoglanis species .
Oreonectes furcocaudalis - Oreonectes furcocaudalis is a species of ray-finned fish in the genus Oreonectes.
Oreonectes microphthalmus - Oreonectes microphthalmus is a species of ray-finned fish in the genus Oreonectes.
Oreonectes polystigmus - Oreonectes polystigmus is a species of ray-finned fish in the genus Oreonectes.
Oreonectes retrodorsalis - Oreonectes retrodorsalis is a species of ray-finned fish in the genus Oreonectes.
Orestias - Its mouth was nearly turned upwards and therefore the flat head had a dished shape.
Orestias chungarensis - Orestias chungarensis is a species of fish in the Cyprinodontidae family.
Orestias laucaensis - Orestias laucaensis is a species of fish in the Cyprinodontidae family.
Orestias parinacotensis - Orestias parinacotensis is a species of fish in the Cyprinodontidae family.
Oriental butterflyfish - Chaetodon auripes, the oriental butterflyfish, is a species of butterflyfish in the genus Chaetodon.
Oriental flying gurnard - The oriental flying gurnard is up to 40 centimetres in length and is usually a grayish brown color with dark markings.
Oriental sillago - The oriental trumpeter whiting is one of 29 species in the genus Sillago, which is one of three divisions of the smelt whiting family Sillaginidae.
Oriental sweetlip - Plectorhinchus orientalis is a Grunt from the Indo-Pacific.
Oriental sweetlips - Juveniles are striped black.
Oriental weatherfish - Like many other loaches, they are slender and eel-like.
Ornate angelfish - They are a mid-sized angelfish reaching a maximum of 7in/18cm at adulthood.
Ornate bichir - P.
Ornate butterflyfish - It is a close relative of the Mailed Butterflyfish and the Scrawled Butterflyfish .
Ornate ctenopoma - Junior synonym refers to a scientific name applied to a species after its initially published name .
Ornate dogfish - The ornate dogfish, Centroscyllium ornatum, is dogfish shark which is not widely known.
Ornate eagle ray - The ornate eagle ray or reticulate eagle ray is a species of fish in the Myliobatidae family.
Ornate sleeper-ray - Electrolux addisoni is easily distinguished from other narcinids by its striking colour pattern consisting of a dark brown dorsal surface of the disc with numerous small pale yellow spots and a series of concentric black stripes.
Orthochromis malagaraziensis - Orthochromis malagaraziensis is a species of fish in the Cichlidae family.
Orthochromis mazimeroensis - Orthochromis mazimeroensis is a species of fish in the Cichlidae family.
Orthochromis mosoensis - Orthochromis mosoensis is a species of fish in the Cichlidae family.
Orthosternarchus tamandua - Orthosternarchus tamandua is a species of weakly electric knifefish in the family Apteronotidae, native to the deep river channels of the Amazon River system.
Orthrias potaninorum - Orthrias potaninorum is a species of ray-finned fish in the genus Orthrias.
Orthrias sawadai - Orthrias sawadai is a species of ray-finned fish in the genus Orthrias.
Orthrias tschaiyssuensis - Orthrias tschaiyssuensis is a species of ray-finned fish in the Balitoridae family.
Ospatulus palaemophagus - Ospatulus palaemophagus is a species of ray-finned fish in the Cyprinidae family.
Ossubtus xinguense - It originates from the Xingu River basin, but is restricted to the rapids area around Altamira City, Pará, Brazil.
Osteobrama alfredianus - Osteobrama alfredianus is a species of ray-finned fish in the genus Osteobrama.
Osteobrama bhimensis - Osteobrama bhimensis is a species of ray-finned fish in the genus Osteobrama.
Osteobrama feae - Osteobrama feae is a species of ray-finned fish in the genus Osteobrama.
Ot baligi - Pseudophoxinus fahirae is a species of ray-finned fish in the Cyprinidae family.
Ot baligi - Pseudophoxinus maeandri is a species of ray-finned fish in the Cyprinidae family.
Otocinclus cocama - The zebra oto was described in 2004 from a tributary of the Río Ucayali in Peru.
Otopharynx argyrosoma - It is found in Malawi, Mozambique, and Tanzania.
Otopharynx brooksi - It's edibility is unverfied.
Otopharynx decorus - Otopharynx decorus is a species of fish in the Cichlidae family.
Otopharynx ovatus - Otopharynx ovatus is a species of fish in the Cichlidae family.
Otopharynx pachycheilus - It is endemic to Malawi.
Otopharynx selenurus - Otopharynx selenurus is a species of fish in the Cichlidae family.
Otopharynx speciosus - Otopharynx speciosus is a species of fish in the Cichlidae family.
Otopharynx tetraspilus - Otopharynx tetraspilus is a species of fish in the Cichlidae family.
Otopharynx tetrastigma - Otopharynx tetrastigma is a species of fish in the Cichlidae family.
Otothyropsis marapoama - Otothyropsis marapoama is classified in the tribe Otothyrini within the subfamily Hypoptopomatinae.
Ouachita madtom - The Ouachita madtom was considered an Endangered Species by the IUCN in 1986 and 1988 but assessments in 1990 and 1994 showed it to be vulnerable.
Ouachita mountain shiner - The Ouachita Mountain shiner is a species of ray-finned fish in the family Cyprinidae.
Oval electric ray - Both Typhlonarke species are native to New Zealand; the exact distribution of each species is uncertain due to confusion between the two.
Oxeye oreo - The warty oreo resembles the spiky oreo.
Oxleyan pygmy perch - The Oxleyan Pygmy Perch is a species of perch-like fish in the Percichthyidae family.
Oxyeleotris expatria - Oxyeleotris expatria is a small fish, growing only a mere 14cm in length.
Oyster toadfish - The species can live in very bad conditions and needs little food to live.
Ozark bass - A.
Ozark cavefish - The Ozark cavefish is pinkish-white and reaches a maximum length of two inches .
Ozark minnow - Ozark Minnow is a species of ray-finned fish in the genus Notropis.
Ozark shiner - Ozark Shiner is a species of ray-finned fish in the genus Notropis.
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