To make Anaconda executables like conda or anaconda-navigator available in your shell, you’ll need to edit your ~/.config/fish/fish.config and add the directory where the commands are located.
If you’re using Anaconda with Python 2.x, the path will be /anaconda2/bin/.
For Python 3.x and up: /anaconda3/bin/
Just add a line the following line to your ~/.config/fish/fish.config:
set -gx PATH $PATH /anaconda2/bin/
Chris