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Icefish are a type of Antarctic fish belonging to various families, including the Channichthyidae family. They have no haemoglobin and their blood is transparent. They feed on krill, copepods, and other fish. Icefish rely on well-oxygenated water and absorb oxygen directly through the skin as they lack red blood cells.
Atlantic salmon larva
Photo credit: Uwe KilsAn Atlantic salmon (Salmo salar) egg hatching. The Alevin (larva) has grown around the remains of the yolk sac - visible are the arteries spinning around the yolk and little oildrops, also the gut, the spine, the main caudal blood vessel, the bladder and the arcs of the gills. In about 24 hours it will be a fry without yolk sac.
Photo credit: Jón Helgi Jónsson
The Oscar (Astronotus ocellatus) is a species of fish from the cichlid family. In South America, where the species occurs, they are often found for sale as a food fish in the local markets. The species is also a popular aquarium fish. They have been reported to grow to a length of 45 cm (ca. 18 in) and a mass of 1.6 kg (3.5 lb).
Photo credit: Jens Petersen
The red lionfish (Pterois volitans) is a venomous coral reef fish from the Indian and western Pacific Oceans. It was also introduced to the east coast of the United States, and can be found from Florida to Long Island, New York. This specimen was found at Tasik Ria, Manado, Indonesia.
Photo credit: Christian Mehlführer
Broadbarred firefish (Pterois antennata) in Schönbrunn Zoo, Vienna, Austria. Pterois is a genus of marine fish found mostly in the Indo-Pacific. Scorpionfish is another common name of Pterois, as its spines are venomous.
Photo credit: Luc Viatour
The mandarinfish (Synchiropus splendidus, not to be confused with the similarly named mandarin fish) is a small (~6 cm or 2.4 in), brightly-colored member of the dragonet family, popular in the saltwater aquarium trade. The mandarinfish is native to the Western Pacific, ranging approximately from the Ryukyu Islands south to Australia.
Photo credit: André Karwath
The paradise fish (Macropodus opercularis) are small freshwater labyrinth fish found in ditches and paddy fields in East Asia, ranging from the Korean Peninsula to Northern Vietnam, popular within the aquarium trade.
Photo credit: Matthew Field
The leopard shark (Triakis semifasciata) is a species of hound shark found along the Pacific coast of North America from the U.S. state of Oregon to Mazatlán in Mexico. Typically measuring 1.2–1.5 m (3.9–4.9 ft) long, this slender-bodied shark is characterized by black saddle-like markings and large spots over its back.
Photo: John O'Neill
People jigging—fishing with a type of lure known as a "jig"—for squid in Queenscliff, Victoria, Australia. A jig consists of a lead sinker with a hook molded into it and usually covered by a soft body to attract fish. Jigs are intended to create a jerky, vertical motion, as opposed to spinnerbaits which move through the water horizontally.
Photo: Mila Zinkova
The Peacock flounder (Bothus mancus) is a species of lefteye flounder found widely in relatively shallow waters in the Indo-Pacific. This photomontage shows four separate views of the same fish, each several minutes apart, starting from the top left. Over the course of the photos, the fish changes its colors to match its new surroundings, and then finally (bottom right) buries itself in the sand, leaving only the eyes protruding.
Photo: Matthew Hoelscher, Papa Lima Whiskey
The Atlantic spadefish is a species of marine fish endemic to the shallow waters off the coast of the southeastern United States and in the Caribbean Sea. They are similar in appearance to fresh water angelfish, but much larger, reaching up to three feet (0.9 m) in length. Due to their reputation as strong fighters, they are popular game fish, especially during the summer months when they are most active.
A plate with fossils of Pseudostacus sp. (lobster, left) and Diplomystus birdii (fish, right), from the Hakel paleontological formation in Lebanon. The paleontological sites of Lebanon contain deposits of some of the best-preserved fossils in the world, and include some species found nowhere else. The most famous of these is the Lebanese lagerstätten of the Late Cretaceous age.
Photo: Steve Ross, NOAA Office of Ocean Exploration
The redeye gaper (Chaunax stigmaeus) is a sedentary species of anglerfish native to deep waters in the western North Atlantic from the Georges Bank off New England southward to the Blake Plateau off South Carolina. It is a sedentary ambush predator that spends most of its time resting on the sea floor on its pectoral and pelvic fins, moving only to capture prey or avoid predators.
A sketch of a longnose sawshark (Pristiophorus cirratus), a species of sawshark found in the eastern Indian Ocean around southern Australia on the continental shelf at depths of between 40 and 310 m (130 and 1,020 ft). It is a medium-sized shark with a saw-like flattened snout which measures up to thirty percent of its body size.
The Eurasian ruffe (Gymnocephalus cernua) is a species of freshwater fish found in temperate regions of Europe and Asia. The aggressive fish is known to reproduce rapidly, leading to problems when it is introduced to foreign bodies of water.
Bryaninops yongei is a benthic species of goby widely distributed throughout the tropical and subtropical waters of the Indian Ocean; it is commonly found living in and around coral. Although this species was discovered in 1906, its ability to propel itself quickly to escape predators makes it difficult to study.
Photograph: Alexander Vasenin
The orbicular batfish (Platax orbicularis) is a batfish endemic to the Indian and Pacific Oceans. It has a thin, disc-shaped body, and male can grow up to 50 centimetres (20 in) in length. In the wild, the orbicular batfish lives in brackish or marine waters, usually around reefs, at depths from 5 to 30 metres (20 to 100 ft). It is also a popular aquarium fish, although captive specimens generally do not grow as long as wild ones.
Photograph: Beckmannjan
The flying gurnard is a fish of tropical to warm temperate waters on both sides of the Atlantic Ocean. When excited, it spreads its "wings", semi-transparent appendages tipped with a phosphorescent bright blue coloration which are used to frighten predators.
Photograph: Nick Hobgood
Caesio teres is a pelagic marine fish belonging to the family Caesionidae. Widely distributed throughout the tropical waters of the Indian and western Pacific Ocean, this species feeds on zooplankton. It can grow to 40 cm (16 in) in length.
Photograph: Luc Viatour
A feeding frenzy of common carp (Cyprinus carpio) at the pond of the Agdal Gardens in Marrakesh, Morocco. Feeding frenzies may occur when predators are overwhelmed by the amount of prey available, or as a result of competition for food.
Photograph: Nick Hobgood
A juvenile black-sided hawkfish, a species of hawkfish from the Indo-Pacific. It is occasionally found in the aquarium trade and is also of minor importance to local commercial fisheries. It grows to a total length of 22 cm (9 in).
Photograph: Nick Hobgood
The ocellaris clownfish (Amphiprion ocellaris) is a marine fish of the family Pomacentridae. Reaching about 110 mm (4.3 in) in length, the species may have a range of colors. After clownfish hatch, they initially reside near the surface. When they become juveniles, however, they move to the seafloor to find a host anemone, forming a symbiotic relationship in which they obtain protection in return for defense.
Photograph credit: Seotaro
Rhinogobius flumineus, also known as the lizard goby, is a species of goby in the family Oxudercidae endemic to Japan, seen here in Hamamatsu, Shizuoka Prefecture. A small freshwater fish found in fast-flowing streams, it maintains its position against the current by gripping a rock with a sucker formed from two of its fins. The fish's mouth is slightly asymmetric; dextral (right-sided) fish tend to curve their bodies to the right as they rest, while sinistral (left-sided) fish tend to adopt a left-curving posture. The fish are omnivorous, picking edible items off the stream bed with the side of the mouth, but dextral and sinistral fish show no preference for which side of the mouth they use for this purpose.
Photograph credit: Betty Wills
The spotted trunkfish (Lactophrys bicaudalis) is a species of ray-finned fish in the family Ostraciidae, native to the Caribbean Sea and parts of the western Atlantic Ocean. Members of this family are known as boxfishes because they have a hard outer covering consisting of hexagonal, plate-like scales fused together into a solid, triangular or box-like carapace. Because of this casing, the body of the spotted trunkfish is not flexible, and locomotion is normally limited to slow movements performed by rippling its dorsal and anal fins and gently beating its pectoral fins. If faster motion is required, it can additionally use its caudal fin for propulsion. This spotted trunkfish was photographed at a depth of about 40 ft (12 m) at Bari Reef, Bonaire.
Photograph credit: Rucha Karkarey; edited by John Harrison
The round ribbontail ray (Taeniura meyeni) is a species of stingray in the family Dasyatidae, found throughout the nearshore waters of the tropical Indo-Pacific region. Reaching 1.8 m (6 ft) across, this large ray is characterized by a thick, rounded pectoral fin disc covered by small tubercles on top, and a relatively short tail bearing a single venomous spine. The ray is well-camouflaged when lying on the seabed; it is largely nocturnal, and preys on molluscs, crustaceans and bony fish. Mature females bear litters of up to seven pups, which are fed during gestation on "uterine milk", a product secreted by the walls of the oviduct. This round ribbontail ray was photographed in Lakshadweep, India.
Photograph credit: Rickard Zerpe
Brachysomophis cirrocheilos, the stargazer snake eel, is a marine fish belonging to the family Ophichthidae. It is native to shallow tropical and subtropical waters in the western Indo-Pacific region. It hunts at night for crustaceans and small fish, after which it submerges itself into the sediment tail first and remains there all day, with just its eyes and the top of its head projecting, as seen here in Batangas Bay in the Philippines.
File:Psetta maxima Luc Viatour.jpg
Photo by Fritz Geller-Grimm
Mudskippers, such as this Periophthalmodon septemradiatus, are uniquely adapted to a completely amphibious lifestyle. They are active when out of water, feeding and interacting with one another, as well as defending their territories.
File:Kaimanfische (Lepisosteus).jpg
Photo by Raimond Spekking
In American English, the name gar (or garpike) is strictly applied to members of the Lepisosteidae, a family including seven living species of fish in two genera that inhabit fresh, brackish, and occasionally marine, waters of eastern North America, Central America, and the Caribbean islands.
Author: M. Kraus (Fg-tiger), Uploader: Überraschungsbilder
A discus (Symphysodon discus) is guarding its eggs. As for most cichlids, brood care is highly developed with both the parents caring for the young. Additionally, adult discus produce a secretion through their skin, off which the larvae live during their first few days.
File:Balistapus undulatus (Nausicaä).jpg
Camouflaged flounder
File:Seahorse Skeleton Macro 8 - edit.jpg
Dried seahorse used in traditional Chinese medicine
Koi are ornamental domesticated varieties of the common carp Cyprinus carpio, originated from China and widely spread in Japan. They are very closely related to goldfish. The word "koi" comes from Japanese meaning "carp".
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File:Pennant coralfish melb aquarium edit2.jpg
File:Isurus oxyrinchus Machoire.jpg
Jaw of a shortfin mako shark
File:Koi feeding, National Arboretum.jpg
Koi feeding
File:Thrissops cf formosus 01.jpg
Thrissops formosus
File:Platax Orbicularis in the Egyptian Red Sea.jpg
File:Canthigaster valentini 1.jpg
Valentinni's sharpnose puffer, Canthigaster valentini, is a pufferfish of the genus Canthigaster, and can be found in reefs throughout the Pacific Ocean and Indian Ocean. It reaches a maximum length of 11 cm. It is also referred to as a black saddled toby.
File:Hippocampus hippocampus (on Ascophyllum nodosum).jpg
File:Zebrasoma flavescens Luc Viatour.jpg
File:Gymnocephalus cernuus Pärnu River Estonia 2010-01-06.jpg
File:Georgia Aquarium - Giant Grouper.jpg
Photo credit: Diliff
The giant grouper (Epinephelus lanceolatus), shown here with a school of golden trevally, is the largest bony fish found in coral reefs, and the aquatic emblem of Queensland, Australia. The species can grow as large as 2.7 meters (9 ft) long, weighing up to 400 kg (880 lb). They are fairly common in shallow waters and feed on a variety of marine life, including small sharks and juvenile sea turtles.
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Mediterranean scaldfish larva
Photo by Daniella Vereeken
The Siamese fighting fish (Betta splendens), or fighting betta is a freshwater fish related to the paradise fish. The fighting fish is a species in the Gourami family which is popular as an aquarium fish. They are called pla-kad (biting fish) in Thai or trey krem in Khmer. They are a very territorial fish and it is unwise to house two males together. Even the females may become territorial towards each other if not housed in a large enough tank.
File:Paracirrhites forsteri Forsters Hawkfish juvenile Papua New Guinea by Nick Hobgood.jpg
Juvenile black-sided hawkfish
File:Snowflake moray in Kona.jpg
