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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 — Webster
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
Ichthyology, also known as fish science, is the branch of zoology devoted to the study of fish. This includes bony fish (Osteichthyes), cartilaginous fish (Chondrichthyes), and jawless fish (Agnatha). While a large number of species have been discovered, approximately 250 new species are officially described by science each year. According to FishBase, 33,400 species of fish had been described by October 2016. — Wikipedia
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Fish Link Central
Fish News -- ScienceDaily All about fish. Current research in marine biology including fish habitats, aquaculture, speciation, deep sea fish and more.
- How did vertebrates first evolve jaws?on June 28, 2022 at 12:33 pm
Scientists reveal clues about the evolutionary origin of jaws by studying the embryonic development of zebrafish -- an approach known as 'evo-devo.' Using imaging and cell tracing techniques in zebrafish, researchers who conducted the study conclusively showed that the pseudobranch originates from the same mandibular arch that gives rise to the jaw.
- Southern resident killer whales not getting...on June 27, 2022 at 8:59 pm
The endangered southern resident killer whale population isn't getting enough to eat, and hasn't been since 2018, a new study has determined. The animals have been in an energy deficit, averaged across spring, summer and fall, for six of the last 40 years -- meaning the energy they get from food is less than what they expend. Three of those six years came in the most recent years of the study, 2018 to 2020. The average difference in energy is 28,716 calories, or about 17 per cent of the daily […]
- Study finds chaos is more common in ecological...on June 27, 2022 at 4:49 pm
Chaos in natural populations appears to be much more common than previously recognized, according to a new analysis. Populations of organisms in natural ecosystems fluctuate a lot, and a key question for ecologists is whether those fluctuations are regular (varying around some theoretically 'stable' equilibrium), random (completely unpredictable), or chaotic. Chaotic systems, like the weather, can be predictable in the short term but not in the long term, and they are highly sensitive to small […]
- Biofinder advances detection of extraterrestrial...on June 25, 2022 at 12:15 am
An innovative scientific instrument, the Compact Color Biofinder may change the game in the search for signs of extraterrestrial life.
- Climate change could lead to a dramatic...on June 23, 2022 at 8:43 pm
The effects of global climate change already are resulting in the loss of sea ice, accelerated sea level rise, and longer and more intense heat waves, among other threats. Now, a survey of planktonic lipids in the global ocean predicts a temperature-linked decrease in the production of essential omega-3 fatty acids, an important subset of lipid molecules. A significant implication of the survey is that as global warming proceeds, there will be fewer and fewer omega-3 fatty acids produced by […]
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- Aquaculture drives aquatic food yields to new highon June 29, 2022 at 12:48 pm
The production of wild and farm-raised fish, shellfish and algae reached record levels in 2020, and future increases could be vital to fighting world hunger, the Food and Agriculture Organization said Wednesday.
- Whale entanglements drop, but remain major...on June 28, 2022 at 9:09 pm
The number of whales entangled in fishing gear has declined recently, but the entanglements remain a critical threat to rare species, the federal government said in a report released Tuesday.
- Chesapeake Bay 'dead zone' predicted to be 13%...on June 28, 2022 at 7:48 pm
This summer's Chesapeake Bay "dead zone" is expected to be smaller than the long-term average, according to a forecast released today by researchers from the University of Michigan, Chesapeake Bay Program, University of Maryland Center for Environmental Science and U.S. Geological Survey.
- Climate change is shrinking and fragmenting...on June 28, 2022 at 5:22 pm
Salmon famously travel hundreds of miles upstream to reach their home waters to spawn, but climate change is shrinking their destination. A new study offers high-resolution details on how Chinook salmon habitats are being lost on Bear Valley Creek, a headwater stream of the Salmon River in central Idaho.
- New technology turns the whole fish into foodon June 28, 2022 at 5:22 pm
In the meat industry, it's common practice to turn the whole animal into food products. In the fish industry, over half of the weight of the fish ends up as side-streams which never reach our plates. This takes a toll on the environment and is out of step with Swedish food and fisheries strategies. Now, food researchers at Chalmers are introducing a new sorting technology that means we get five good cuts from fish and not just the filet. A herring processing plant on Sweden's west coast is […]
Here are links to pages about closely related subjects.
Life Cell, Gene, Tree of Life
Plant Flower, Tree
Invertebrate Cuttlefish, Octopus, Ant, Bee, Butterfly, Spider, Lobster
Vertebrate Fish, Seahorse, Ray, Shark, Frog, Turtle, Tortoise, Dinosaur
Bird, Ostrich, Owl, Crow, Parrot
Mammal Bat, Rabbit, Giraffe, Camel, Horse, Elephant, Mammoth
Whale, Dolphin, Walrus, Seal, Polar Bear, Bear, Cat, Tiger, Lion, Dog, Wolf
Monkey, Chimpanzee, Human