You can go fishing in some locations of the Mazes during the corresponding event. To catch the salmon and cook some delicious steaks you need to make fishing poles and lures at the Researcher's Desk (you will find it near the local campfire).
When everything is ready, just look for the schools of fish and take your time to catch it. In order to use your fishing gear, make sure the shore near the school of fish is completely clear and press directly into the center of the fishing spot.