A fish file extension is related to the 3D Fish Tank and used for its data files.
FISH file extension - 3D Fish Tank data
What is fish file? How to open fish files?
File type specification:
The fish file extension is associated with the 3D Fish Tank, an application developed by the Fearby.com software company.
The fish file stores various data used for internal purposes of the 3D Fish Tank.
The 3D Fish Tank seems to be obsolete product without support from developer.
This fish file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.