Fish, as a topic, encompasses the study of aquatic, primarily gill-breathing vertebrates within ichthyology, integrating anatomy, physiology, ecology, evolution, and systematics across jawless (Agnatha), cartilaginous (Chondrichthyes), and bony (Osteichthyes) lineages. Research topics include osmoregulatory strategies in freshwater and marine environments, hydrodynamics of locomotion, sensory biology (e.g., lateral line and electroreception), reproductive modes, life-history strategies, and trophic interactions within aquatic food webs. Fish also serve as model systems in developmental biology, genomics, ecotoxicology, and conservation biology, with topics addressing population dynamics, stock assessment, habitat degradation, climate-driven distribution shifts, and biodiversity patterns in marine and inland waters.
Small, colorless, and blind, amblyopsid cavefishes inhabit subterranean waters throughout the eastern United States. In a new study, Yale researchers reveal insights into just how these distinctive cave dwellers evolved—and ...
Evolution
Aug 27, 2025
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Marine biologists at UC San Diego's Scripps Institution of Oceanography have released a new database of size parameters for 1,308 species of Pacific coral reef fishes, advancing scientists' understanding of fish health and ...
Plants & Animals
Aug 27, 2025
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Climate change is reshaping fish habitats. Some fish are winners, others are losing out.
Ecology
Aug 20, 2025
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The Polish Geological Institute-National Research Institute reports a Lower Devonian (419 to 393 million years ago) fossilized trackway in the Holy Cross Mountains, Poland, attributed to dipnoan fish. Their analysis finds ...
Nature often puts on incredible displays. A recent example caught on camera shows thousands of bumblebee catfish (Rhyacoglanis paranensis) climbing waterfalls in southern Brazil. This is the first time the species has been ...
A first database has been compiled of the frog and freshwater fish species on hundreds of Australian islands.
Plants & Animals
Aug 14, 2025
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Wild salmon are not just rarer than their farmed cousins—they're better looking too. In a new study by my colleagues and I, we found that they are noticeably more symmetrical than those reared in captivity. In other words, ...
Plants & Animals
Aug 12, 2025
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Japanese rice fish, known as medaka, are small, easy to breed, and reproduce daily, making them widely used as model organisms around the world.
Plants & Animals
Aug 7, 2025
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An international team led by scientists from the Canadian Museum of Nature and the University of Chicago reconstructed the brain, heart, and fins of an extinct fish called Norselaspis glacialis from a tiny fossil the size ...
Evolution
Aug 6, 2025
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Almost all animals have symmetrical bodies. Bilateral symmetry is almost universal in all animals and is only very rarely broken—with exceptions like the five-armed starfish or crab species that have one large and one small ...
Evolution
Jul 30, 2025
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