Fish

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fish : any of numerous cold-blooded strictly aquatic craniate vertebrates that include the bony fishes and usually the cartilaginous and jawless fishes and that have typically an elongated somewhat spindle-shaped body terminating in a broad caudal (see caudal 2) fin, limbs in the form of fins when present at all, and a 2-chambered heart by which blood is sent through thoracic gills to be oxygenated — Merriam-Webster See also OneLook

Thesaurus

Roget’s II (Thesaurus.com), Merriam-Webster Thesaurus, Visuwords

Encyclopedia

Fish are the gill-bearing aquatic craniate animals that lack limbs with digits. They form a sister group to the tunicates, together forming the olfactores. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Tetrapods emerged within lobe-finned fishes, so cladistically they are fish as well. However, traditionally fish are rendered paraphyletic by excluding the tetrapods (i.e., the amphibians, reptiles, birds and mammals which all descended from within the same ancestry). Because in this manner the term “fish” is defined negatively as a paraphyletic group, it is not considered a formal taxonomic grouping in systematic biology. The traditional term pisces (also ichthyes) is considered a typological, but not a phylogenetic classification. — Wikipedia

Fish (Encyclopædia Britannica)

Bony Vertebrates (One Zoom)

Agnatha (Catalogue of Life)
Chondrichthyes (Catalogue of Life)
Osteichthyes (Catalogue of Life)
Actinopterygii (Catalogue of Life)

Fish (WolframAlpha)

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Adventures

Explore related posts on Cosma …

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Cuttle Vision - Cuttlefish are odd creatures, so news stories about them tend to be interesting. However, a story about them that’s going a bit viral is downright amusing! As you can see from the image in this video from the Guardian, some scientists wanted to find out whether or not cuttlefish have stereoscopic vision (like humans do), … Continue reading Cuttle Vision

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Inspiration

Among a Thousand Fish: Diving with Caranx (Air Pano, YouTube 360° Video)

Tropical Fish Cam (Aquarium of the Pacific in Long Beach, California, Explore.org)

Talks about Fish (TED: Ideas Worth Spreading)
Articles about Fish (Big Think)

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Innovation

Science

Ichthyology, also called fish science, is the branch of zoology devoted to the study of fish, including jawless fish (Agnatha), cartilaginous fish (Chondrichthyes) and bony fish (Osteichthyes). According to FishBase, 33,400 species of fish had been described as of October 2016, with approximately 250 new species described each year. — Wikipedia

Ichthyology (Encyclopædia Britannica)

FishBase (R. Froese & D. Pauly)
Eschmeyer’s Catalog of Fishes (California Academy of Sciences)

Discover Fishes (Florida Museum of Natural History)

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Preservation

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Participation

Education

Fish (Science Trek)
Here Fishy Fishy (Biology4Kids)

Fascinating Fish (OLogy, American Museum of Natural History)

MERLOT: Multimedia Educational Resource for Learning and Online Teaching
OER Commons: Open Educational Resources

Community

Occupation

Zoologists and Wildlife Biologists (CareerOneStop, U.S. Department of Labor, Employment and Training Administration)

Organization

American Society of Ichthyologists and Herpetologists
Zoological Association of America
Association of Zoos and Aquariums

News

Ichthyology & Herpetology (American Society of Ichthyologists and Herpetologists)
Fish (EurekaAlert, American Association for the Advancement of Science)
Fish (bioRxiv: Preprint Server for Biology, Cold Spring Harbor Laboratory)
Fish (JSTOR)
Fish (Science Daily)
Fish (Science News)
Fish (Phys.org)
Fish (NPR Archives)

Government

Fish & Sharks (Northeast Fisheries Science Center, NOAA Fisheries)

More News …

Fish News -- ScienceDaily All about fish. Current research in marine biology including fish habitats, aquaculture, speciation, deep sea fish and more.

A coral reef thought dead for 60 years is teeming...
on September 15, 2026 at 2:18 am
More than 60 years after surveys suggested a deep coral reef off Benin was probably dead, scientists have found it alive. Cameras revealed healthy-looking coral patches supporting multiple fish species more than 50 meters beneath the surface. The discovery suggests West Africa’s coastal waters may contain other overlooked reefs that have yet to be documented.
Scientists overturn a theory about this shark’s...
on September 4, 2026 at 10:24 pm
Scientists have overturned a leading explanation for why male and female bonnethead sharks have differently shaped heads. Instead of males developing a pointed snout at maturity, both sexes actually begin with more pointed heads that become rounder with age, particularly in females.
Ancient “living fossils” may reveal how...
on September 3, 2026 at 1:11 pm
A newly discovered microbe living inside ancient stromatolite communities may offer a rare look at how complex life first emerged. Researchers captured the first direct images of an Asgard archaeon physically connected to a bacterium, with the two microbes appearing to exchange nutrients and other compounds. Scientists think similar partnerships billions of years ago may have helped produce the first complex cells.
Bird flu is spreading. Your backyard feeder could...
on August 24, 2026 at 12:49 pm
Backyard bird feeders could become unexpected hotspots for H5N1 as Australia’s bird flu outbreak spreads, bringing species together in ways that rarely occur naturally. Experts say stopping feeding is safest, while smaller amounts of food, no hand-feeding, and careful cleaning can reduce the danger.
This shark can live 400 years. Its eyes barely...
on August 23, 2026 at 3:14 am
Greenland sharks may live for 400 years without suffering the kind of retinal decline normally associated with aging. Researchers found healthy eye tissue and active proteins specially adapted for seeing blue light in the dim Arctic depths. DNA repair mechanisms may help keep their eyes functioning across centuries. The discovery could eventually offer new clues for protecting human vision as we age.

Phys.org - latest science and technology news stories Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.

Sharks on the move expose the need for...
on September 17, 2026 at 12:40 am
Understanding the migration pathways of sharks and rays is key to conserving some of the world's most endangered marine species, according to new University of Queensland research.
Long-term oyster reef restoration shows clear...
on September 16, 2026 at 11:50 pm
Large-scale oyster reef restoration in the Chesapeake Bay is successfully creating three-dimensional habitats that support larger, more diverse fish communities, according to new research from scientists at the University of Maryland, Baltimore County (UMBC), the Smithsonian Environmental Research Center and the National Oceanic and Atmospheric Administration (NOAA). The study, published in Ecosphere, provides compelling evidence that restoration efforts are shifting underwater ecosystems from […]
Tiny oyster larvae rely on gravity to feed
on September 16, 2026 at 10:20 pm
Eastern oyster larvae are only 100–300 micrometers long, but their dense calcium carbonate shells make them substantially heavier than the surrounding seawater. A new study led by the Woods Hole Oceanographic Institution (WHOI) shows that this excess weight allows gravity to drive the feeding currents the larvae use to bring food to their mouths, a finding that reveals a critical role for gravity in how these tiny animals feed and survive.
Roll waves emerge as uniform water flow...
on September 16, 2026 at 9:00 pm
When it rains, traveling waves appear on steep asphalt pavement, slowly making their way down the slope. Because these so-called "roll waves" propagate without deforming and are typically characterized by abrupt discontinuities, they play an important role in hydraulic engineering. Understanding unsteady flows like roll waves is crucial for the design, management and safety of hydraulic structures such as dam spillway chutes.
Earthshot and the science of positive tipping...
on September 16, 2026 at 6:40 pm
It must be tough being a judge for the world's most prestigious environmental prize: Imagine having to choose between an ingenious machine that removes microplastics from a river in Europe or a company in East Africa that sells clean cookstoves through affordable weekly installments.