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Jun 13 2022

Deneki Chronicles: 19 Reasons to Fish a Mouse Fly

The shrew-eating trout of Togiak National Wildlife Refuge. Photo: U.S. Fish and Wildlife Service

In This Week’s Deneki Chronicles, it’s trout week and we’re looking back at what the trout have been and continually gorge on.

Mouse fishing for rainbow trout
Piggy ate a mouse. Photo: Ben West.

It’s no secret how much we love fishing mouse patterns for big Alaskan rainbow trout. We do a lot of it, and, as odd as it may sound, it is our most productive method for catching trout on the surface. With a conveyor belt of salmon flesh and eggs throughout an already short growing season, these trout are looking for a meal, and that size 16 mayfly is just not going to do it.

However, often asked if ‘trout really feed on mice?’ Or if our mouse fly is just acting as an ‘attractor to an extremely opportunistic fish?’ This is difficult for us to prove if trout do indeed consume small mammals because we have released every trout we catch.

That being said, In the summer of 2013, researchers from the U.S. Fish and Wildlife Service conducted some research on rainbow trout from our river in the Togiak National Wildlife Refuge. While collecting their sample, one fish was deemed a mortality capture, and as standard protocol, the fish was opened up to examine the stomach contents. What did they find? Not one, not two, but NINETEEN (with some counts at twenty) partially digested shrews in its stomach! Shrews are a smaller mammal on average than a typical mouse, and while there are some feeding differences, they are very similar in appearance to a mouse. Certainly identical enough to justify our mouse patterns! The best part? The trout only measured out to 19 inches in length! Indeed a good trout, but not quite trophy caliber by Alaska standards!

There’s your reason to fish a mouse fly in Alaska, all 19 of them.

More on Trout Food

  • Secrets of the Flesh Fly
  • Sculpin Fishing From Alaska to Chile
  • Bead Fishing for Rainbow Trout

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