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SFTP isn't the FTP protocol over ssh, but an extension to the SSH protocol included in SSH2 (and some SSH1 implementations). SFTP is a file transfer protocol similar to FTP but uses the SSH protocol as the network protocol (and benefits from leaving SSH to handle the authentication and encryption). SCP is only for transferring files, and can't do other ...

FISH and SFTP are similar, and as observed do both work over SSH, SFTP requires specific support and configuration in the SSH Server to facilitate the transfer, but it a bit more secure and allows for SysAdmins to only allow SFTP (in these situations FISH won't work). FISH requires a shell (sh/rsh for instance) to copy, and hence requires full SSH access to ...