Trout must swim upstream in order to breathe. Water enters their mouth and exits the gills as they face upstream. In addition, by facing upstream, the trout catch whatever food comes their way by the flow of the current. So for a
Do trout swim upstream?
Trout instinctively swim upstream to lay their eggs and reproduce close to the place where they were born. ... Trout are anadromous, which means they naturally want to ascend into rivers from the sea to spawn.
Should you trout fish upstream or downstream?
It is better to fish upstream. Fishing upstream allows you to use the current to your advantage, to remain less detectable to fish, and it's simply safer than fishing downstream.
