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Catalog of Fishes

From Wikipedia, the free encyclopedia

Catalog of Fishes is a comprehensive on-line database and reference work on the scientific names of fish species and genera. It is global in its scope and is hosted by the California Academy of Sciences. It has been compiled and is continuously updated by the curator emeritus of the CAS fish collection, William N. Eschmeyer.

The taxonomy maintained by the Catalog of Fishes is considered authoritative and it is used as a baseline reference for instance by the broader global fish database FishBase,[1][2] which involves cross-references to the Catalog's information for all accepted taxa. As of 2015, the searchable catalogue contains entries for about 58,300 fish species names, about 33,400 of which are currently accepted (valid), and for some 10,600 genera (5,100 valid).[3][4] The information given for any species name generally contains the reference to the original description, to the type specimen, references to the usage of the name in taxonomic literature, a statement of the current status of the name and valid name of the taxon, and the family it belongs to.

A printed 3000-page three-volume and CD version of the Catalogue was published in 1998. That was preceded by a Catalog of the genera of recent fishes in 1990.[5]

The Catalog was renamed Eschmeyer's Catalog of Fishes in 2019, and is now edited by Ronald Fricke, Richard van der Laan and William N. Eschmeyer. It is available online, and updated monthly.

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Transcription

All living things on Earth need water, because the chemical reactions that make life possible happen in an aqueous solution. Which means us land animals have to drink it to keep it inside of us all the time. But… what about fish? It seems like since they’re always in the aqueous solution of whatever body of water they’re swimming around in, they wouldn’t need to actually drink the stuff. But it turns out that some fish actually do need to drink. And others do not. It depends on the fish, and what kind of neighborhood it lives in. Water, you should know first of all, is really into finding a balance. If you have a membrane that water can pass through, and there are different concentrations of salt on each side, then the water will always flow toward the saltier side of the membrane, until the concentrations on both sides are the same. That means that freshwater fish have it easy. Since the concentration of salt in their bodies is higher than the concentration in the water, that fresh water just flows right in, mainly through their gills, and into their bloodstream. They also swallow some water when they eat -- I mean, it’s kind of unavoidable -- but they don’t need to actively gulp down water. But, in order to retain that balance of concentrations, the fish’s tissues still need to have some salt in them. And that’s where chloride cells come in. These are special cells in the gills that produce large amounts of an enzyme that controls the flow of dissolved salts -- like sodium and potassium -- across cell membranes. So, in freshwater fish, these chloride cells work hard to bring just the right amount of salt into the fish’s bloodstream. Now, saltwater fish have the opposite problem. For most of them, the concentration of salt in the water is higher than the concentration in their blood. That means that as they pass water over their gills to breathe, the higher concentration of salt outside of their body is constantly sucking water out of them. So these fish have to drink a lot, which they just gulp down by the mouthful. But since the only water around is salty, they have to filter out the salt to make it safe for them to absorb. A lot of that salt is filtered out in the fish’s kidneys. But these fish have chloride cells in their gills, too. It’s just that, in their case, those cells are constantly pumping salts out of the bloodstream and into the saltier water. So they may be surrounded by water, but no matter where they live, fish are always looking to find that balance. Thanks for asking. If you have a quick question you'd like to ask us, we're down in the comments below or on Facebook, Twitter, Tumblr, etc. And if you want to keep getting smarter with us, you can go to YouTube.com/SciShow and subscribe!

See also

References

Original resource

  • Eschmeyer, W.N. Catalog of Fishes Online Database
  • Eschmeyer, W.N. (ed.) 1998. Catalog of fishes. Special Publication, California Academy of Sciences, San Francisco. 3 vols. 2905 p.
  • Eschmeyer, W.N. 1990. Catalog of the genera of recent fishes. California Academy of Sciences, San Francisco. 697 p.
This page was last edited on 19 November 2023, at 18:26
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