Why do the scientific names of fishes change ?

One of the most perplexing question brought up by people is "Why do the scientific names of fish species change.
There are several reasons for the scientific name of a species to change.
To understand this you need to first know how a fish species gets it's scientific name.
When a new species is discovered, someone (the author) or a group of people (the authors) must go through certain procedures.
They prepare a document fully describing the new species and giving all the reasons why it is considered to be new to science.
A specimen of the fish or preferably specimens must be lodged at a museum for future reference purposes. It is now common
practice to also submit DNA samples to a laboratory for analysis.
A two part scientific name (binomial) must be given to the species. The first part is the genus under which the species falls, plus 
a specific name which is decided by the author/s. This name must be latinized and can be a descriptive name or can be named after
a person or persons, or after a place or after a characteristic of the fish. Authors can be very creative and come up with some very 
interesting names. In one particular case a ray was giving the specific name of "electrolux" because of the way in which it sucks
itself onto a rock. When allocating a name, the gender of the specific name should be the same as the gender of the genus name. 
If for example the genus name is masculine the specific name will generally end in "us". There quite a few different endings which
indicate whether the name is based on a person, a couple, a place etc. Once the paper has been completed it is passed on to credible
peers who will review the paper, make suggestion and approve or reject the work. If the paper is approved it must be published and
widely distributed to several hundred institutions and ichthyologists.
The fish now has a scientific name. Now consider the following scenario. An expert reviewing a particular family may travel around
the world studying all the genera and species of this family. He discovers that when examining a specimen that it was previously
described by an earlier in a completely different. The name of the earlier description remains the valid name and newer species name
becomes a synonym. If you have been using the newer name, this is no longer valid and the earlier name must be used.



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