Whenever I enter

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fish://user@host:port/home/user/

into the address bar, I get the error message "Invalid protocol".
Kio itself seems to be working since the following command lists all files in the directory as expected:

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kioclient ls 'fish://user@host:port/home/user/'

I am using the current version of Dolphin shipped by Ubuntu 16.04 LTS, that is Dolphin 15.12.3 / KDE 5.18.0 / Qt 5.5.1. Strangely, on another computer with the same version of Ubuntu / Dolphin the problem does not occur.

Very strange. Perhaps something in the dolphinrc files?

Very strange indeed.

I can reproduce the error in the following way with a fresh installation of dolphin:

1. Download the latest Ubuntu 16.04 image (ubuntu-16.04.3-desktop-amd64.iso ) from http://releases.ubuntu.com/16.04/.
2. Boot into live CD (in my case using VirtualBox, but that should not change things) -> "Try Ubuntu".
3. Enable the "universe" software repository under "Gear-Icon (top-right corner) -> System Settings -> Software & Updates" and reload package list after clicking "Close".
4. Start terminal via "Alt+F2 -> gnome-terminal".
5. Execute "sudo apt install dolphin kde-runtime" in terminal (the second one is for the kioclient test).
6. Execute "dolphin" in terminal, enter "fish://user@host:port/home/user/" in the address bar.
7. You should receive the error "Invalid protocol".
8. Close dolphin.
9. Execute "kioclient ls 'fish://user@host:port/home/user/'" in terminal.
10. Accept ssh key warning, enter password and cancel KWallet window.
11. You may have to repeat steps 9 and 10 once or twice when running kioclient for the first time, then you should receive a list of files in the remote directory.
12. Start dolphin again, the problem should persist.

Does that eliminate the possibility of a corrupt dolphinrc file?

Yep

I'm a little out of my depth here but can supply you with packages I have installed so you can compare.

HTH...

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toad ~ $ dpkg -l|grep kio
ii  kde-cli-tools-data                                               4:5.10.5-2                           all          tools to use kioslaves from the command line
ii  kde-zeroconf                                                     4:16.08.0-1                          amd64        zeroconf plugins and kio slaves for KDE
ii  kdemultimedia-kio-plugins                                        4:16.08.3-1                          all          transitional package for kio-audiocd
ii  kdepimlibs-kio-plugins                                           4:4.14.10-7+b2                       amd64        kio slaves used by KDE PIM applications
ii  kdesdk-kio-plugins                                               4:16.04.0-1                          amd64        transparent Subversion access and Perl documentation KIO slaves
ii  kf5-kdepimlibs-kio-plugins                                       4:16.04.2-2                          amd64        kio slaves used by KDE PIM applications
ii  kio                                                              5.37.0-2                             amd64        Resource and network access abstraction
ii  kio-audiocd                                                      4:16.08.3-1                          amd64        transparent audio CD access for applications using the KDE Platform
ii  kio-extras                                                       4:16.08.3-1                          amd64        Extra functionality for kioslaves.
ii  kio-extras-data                                                  4:16.08.3-1                          all          Extra functionality for kioslaves data files.
ii  libkf5kiocore5:amd64                                             5.37.0-2                             amd64        Resource and network access abstraction
ii  libkf5kiofilewidgets5:amd64                                      5.37.0-2                             amd64        Resource and network access abstraction
ii  libkf5kiogui5:amd64                                              5.37.0-2                             amd64        Resource and network access abstraction
ii  libkf5kiontlm5:amd64                                             5.37.0-2                             amd64        Resource and network access abstraction
ii  libkf5kiowidgets5:amd64                                          5.37.0-2                             amd64        Resource and network access abstraction
ii  libkio5                                                          4:4.14.36-1                          amd64        Network-enabled File Management Library for the KDE Platform
rc  libsmokekio3                                                     4:4.14.2-1                           amd64        KIO SMOKE library
ii  qml-module-org-kde-kio:amd64                                     5.37.0-2                             amd64        provides integration of QML and KDE Frameworks - kio

Thank you very much!

Installing kio-extras solved the problem.

Glad you got it sorted and marked your thread as solved