Download xfishtank
The current version is 3.2.1~pre1.
The file README in the tarball contains installation instructions.
Source
Download source: xfishtank-3.2.1~pre1.tar.gz
Install:
umask 022
tar xf xfishtank-3.2.1~pre1.tar.gz
cd xfishtank-3.2.1~pre1
./configure
make
sudo make install
xfishtank should now be installed as /usr/local/games/xfishtank
NOTE: No debian packages anymore. If you really need one, let me know.